The Periodic Table
The Periodic Table
The Periodic Table
(a) Rubidium, Rb, is in Group I of the Periodic Table. It reacts with water according to the
equation below.
Predict what you would see when a small piece of rubidium is added to cold water.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................[3]
......................................................................................................................................[1]
......................................................................................................................................[1]
(i) Draw a dot and cross diagram to show the bonding in lithium fluoride.
You should show all the electrons.
[2]
(ii) Explain why lithium fluoride conducts electricity when molten but not as a solid.
......................................................................................................................................
...................................................................................................................................... [2]
...................................................................................................................................... [1]
Total / 10
IGCSE CHEMISTRY SET X (Periodic Table)
(a) Which group of elements in a modern Periodic Table is missing from Mendeleevs
Periodic Table?
......................................................................................................................................[1]
(b) Write two other differences between Mendeleevs original table and a modern Periodic
Table.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[2]
(c) Find rubidium, Rb, in the Periodic Table provided on page 16.
Predict the reaction between rubidium and cold
water. Include observations and the chemical
equation.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[3]
Total / 6
TO
(a) Describe what you would observe when a small piece of lithium is
dropped onto the surface of cold water.
.........................................................................................................................................
.
.....................................................................................................................................[2]
(b) Write the equation for the reaction between lithium and water.
.....................................................................................................................................[1]
(c) When lithium reacts with water, lithium ions, Li+, are formed.
Explain why the formation of a lithium ion from a lithium atom is an example of
oxidation.
.........................................................................................................................................
.
.....................................................................................................................................[1]
Predict what you would observe when a small piece of rubidium is dropped onto
cold water.
...
...
.. [3]
IGCSE CHEMISTRY SET X (Periodic Table)
(a) Describe what you would see when chlorine is added to aqueous potassium iodide.
..........................................................................................................................................
......................................................................................................................................[1]
(b) Write the equation for the reaction between chlorine and potassium iodide.
......................................................................................................................................[1]
(c) When chlorine reacts with potassium iodide, iodine molecules are formed.
2I I2 + 2e
..........................................................................................................................................
......................................................................................................................................[1]
(i) Predict, with reasons, whether astatine will react with aqueous potassium iodide.
..................................................................................................................................
..............................................................................................................................[1]
(ii) Write the equation for the reaction between astatine and sodium.
..................................................................................................................................
..............................................................................................................................[1]
[Total: 5]
IGCSE CHEMISTRY SET X (Periodic Table, Structure)
B9 This question is about the chemistry of the elements in Period 3 of the Periodic Table.
(a) Compare the reactions of sodium and of magnesium with cold water. In each case identify the
products formed.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................[3]
(b) Draw electronic structures, including the charges, of the ions present in sodium oxide.
Hence deduce the formula for sodium oxide.
......................................................................................................................................
......................................................................................................................................[2]
(c) Write an equation for the formation of aluminium oxide from its elements.
......................................................................................................................................[1]
(d) Pure sand is silicon(IV) oxide. It has a giant molecular structure similar to that of diamond.
Suggest two physical properties of silicon(IV) oxide.
......................................................................................................................................
......................................................................................................................................[2]
......................................................................................................................................
......................................................................................................................................[2]
[Total: 10]
IGCSE CHEMISTRY SET X (Periodic Table & Atomic Structure)
A3 A student found a copy of a Periodic Table published in the year 1930. Several elements were
missing from this table because they had not yet been discovered. One of these elements was
technetium, Tc.
98
One isotope of technetium has the symbol 43 Tc.
(a) Complete the table below to show the number of subatomic particles in one atom of this isotope.
[2]
number of protons
number of electrons
number of neutrons
[2]
......................................................................................................................................
[1]
98
(c) Explain, in terms of subatomic particles and their charge, why an atom of 43Tc is
electrically neutral.
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................
(d) From its position in the modern Periodic Table predict two properties of technetium.
1 .......................................................................................................................................
2 ................................................................................................................................... [2]
[Total: 7]
IGCSE CHEMISTRY SET X (Periodic Table & Bonding)
(a) Describe what you observe when a small piece of potassium is added to water.
..........................................................................................................................................
..........................................................................................................................................
......................................................................................................................................[2]
(i) Draw a dot and cross diagram to show the bonding in potassium fluoride.
You only need to show the outer (valence) electrons.
(ii) Explain why the melting point of potassium fluoride is very high.
...................................................................................................................................
................................................................................................................................... [3]
Use your knowledge of Group I elements to complete the table of information for caesium.
symbol Cs
(d) The reaction between caesium and water is more vigorous than the reaction between
potassium and water.
Explain why this is so.
..........................................................................................................................................
......................................................................................................................................[2]
Total / 10
IGCSE CHEMISTRY SET X (Periodic Table & Bonding)
A7 Phosphorus is a non-metal.
...................................................................................................................................
...............................................................................................................................[2]
(b) Explain why phosphorus(III) oxide has the properties given below.
explanation .......................................................................................................................
..........................................................................................................................................
explanation .......................................................................................................................
..........................................................................................................................................
explanation .......................................................................................................................
......................................................................................................................................[3]
1 These diagrams show the electron arrangement in the outer shells of five elements, A to E.
All elements are from Period 3 of the Periodic Table.
iodide
Yo
ur
an
sw
er
(a) Put the letters A to E in the table to show which elements are metals and sh
oul
which are non- metals. d
inc
lud
metals non-metals e
det
ail
s
elements of
whic
of th
[2] reagen
s yo
(b) Which element is most likely to be in Group VI? would
use
..................................................................................................................................... [1] each
experi
(c) Which element will form an ion of the type X2+? ment,
..................................................................................................................................... [1]
table
showin
(d) Which element has an atomic number of 15? g th
observ
..................................................................................................................................... [1] ations
you
(e) Which two elements will form an ionic compound with a formula of the type YZ2? would
expect
..................................................................................................................................... [1] to see
th
[Total: 6 marks] equati
ns fo
IGCSE CHEMISTRY SET X (Periodic Table- Halogen) any
reactio
B9 Chlorine, bromine and iodine are elements in Group VII of the Periodic Table. ns.
[7]
(a) Describe how you would carry out a series of experiments to show the trend in
reactivity of these three elements, using the reagents shown below.
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
......................................................................................................................................
...................................................................................................................................... [7]
(b) Chlorine reacts with water to make a solution that can be used as a bleach.
The equation is shown below.
Cl 2
+ H2O HCl + ClOH
Use oxidation numbers to show that chlorine is both oxidised and reduced in this reaction.
......................................................................................................................................
......................................................................................................................................
...................................................................................................................................... [3]
[Total:10 marks]
(d) An aqueous solution of germanium(II) chloride reduces iron(III) ions to iron(II) ions.
Describe a test for iron(II) ions and give the result.
test ...................................................................................................................................
result ............................................................................................................................[2]
[Total: 7]
IGCSE CHEMISTRY SET X (Periodic Table-Bromine & Test)
...................................................................................................................................... [1]
test ..................................................................................................
chlorine 1.56 35
bromine
(d) Bromine is a liquid with a low boiling point and a strong smell.
A technician spilt some bromine in the corner of a room which is free of draughts. After
thirty seconds the bromine could be smelt on the other side of the room.
technician
bromine spillage
Fig. 2
Use the kinetic particle theory to explain why the bromine could be smelt on the other
side of the room.
..........................................................................................................................................
..........................................................................................................................................
..........................................................................................................................................
...................................................................................................................................... [3]
[Total: 8]
IGCSE CHEMISTRY SET X (Periodic Table & Structure)
5 The halogens are a group of diatomic non-metals showing a trend in colour, state and reactivity.
(ii) state?
[1]
(b) The table gives some information about some of the halogens.
bromine -7 +59
(i) Complete the last column in the table to show the state of each of the halogens at
room temperature. [2]
[1]
[1]
(c) Complete the word equation for the reaction of chlorine with potassium iodide.
[2]
(d) (i) Draw a diagram to show the electronic structure of a chlorine molecule.
Show only the outer electrons.
[2]
(ii) State a use of chlorine.
(e) The structures of some substances containing halogens are shown below.
[1]
Na+ Cl Na+ Cl
Cl Na+ Cl Na+
F
+
Na Cl +
Na Cl F Br
Br Br H Cl F
A B C D
[1]
(ii) Which one of these structures forms hydrochloric acid when dissolved in water?
[1]
(f) Astatine, At, is below iodine in Group VII of the Periodic Table.
[1]
[1]
[1]
(iv) The most common isotope of astatine has a nucleon number (mass number) of
210.
Calculate the number of neutrons in this isotope of astatine.
[1]
Total / 17
IGCSE CHEMISTRY SET X (Periodic Table, Bonding and Test)
A B C
D E
[1]
(ii) Which two of these structures represent atoms from the same Group of the
Periodic Table?
and [1]
(iii) Which one of these structures represents an atom with an atomic number of 8?
[1]
(iv) Which one of these structures forms a stable ion by gaining one electron?
[1]
[1]
(b) Complete the following sentences using words from the list.
(i) Draw a diagram to show how the electrons are arranged in a hydrogen molecule.
[1]
(ii) Describe a test for hydrogen.
test
result [2]
Total / 13
6 The halogens are a group of elements showing trends in colour, state and reaction with other halide
ions.
(a) Complete the word equation for the reaction of chlorine with aqueous potassium
bromide.
(b) Explain why an aqueous solution of iodine does not react with potassium chloride.
[1]
(c) The table shows the properties of some halogens.
(i) in total,
[1]
[Total: 10]
IGCSE CHEMISTRY SET X (Periodic Table-halogen, Structure and diffusion)
[1]
(b) Complete the diagram below to show the arrangement of the molecules in liquid
bromine.
[2]
(c) A teacher placed a small amount of liquid bromine in the bottom of a sealed gas jar of
air. After two minutes brown fumes were seen just above the liquid surface. After one
hour the brown colour had spread completely throughout the gas jar.
air
liquid
bromine
[3]
(d) Magnesium salts are colourless but Group VII elements are coloured.
An aqueous solution of magnesium bromide reacts with an aqueous solution of chlorine.
[2]
[1]
(f) The structures of some compounds containing bromine are shown below.
A B C D
Na+ Br Na+ Br Br Br Br Br
F F
H Br
Br Na+ Br Na+ Br Zn2+ Zn2+
Br Br Br Br
Na+ Br Na+ Br F
+
Zn2+ Zn2+
Br Na Br Na+
(i) Write the simplest formula for the substance with structure A.
[1]
[1]
[1]
and [1]
[1]
[Total: 14]
IGCSE chemistry SET X (Periodic Table)
Li
Na Mg
K Ca Ti V
Zr Nb
(a) Answer the following questions by choosing only from the elements shown in
the diagram.
You can use each element once, more than once or not at all.
(i) State the names of two transition elements shown in the diagram.
(ii) State the name of an element which is in Period 3 of the Periodic Table.
.............................................................................................................................. [1]
.............................................................................................................................. [1]
.............................................................................................................................. [1]
.............................................................................................................................. [1]
............... Na + ............... Na O
2
2
[2]
[Total: 8]
IGCSE chemistry SET X (Periodic Table & Bonding)
......................................................................................................................................[1]
(b) What determines the order of the elements in the Periodic Table?
......................................................................................................................................[1]
(c) How many electrons does an atom of tellurium have in its outer shell?
......................................................................................................................................[1]
(d) State the name of a metallic element which is in the same Period as tellurium.
......................................................................................................................................[1]
(e) Tellurium reacts with excess chlorine to form tellurium(IV) chloride, TeCl4.
1 diatomic, ............................................................................................................
2. molecule. ...........................................................................................................
.......................................................................................................................[3]
(ii) Complete the following equation for the reaction between tellurium and excess
chlorine.
......................................................................................................................................[1]
...................................................................................................................................
...................................................................................................................................
(ii) Complete the table to show the numbers of electrons, neutrons and protons in one atom of
bromine-79 and bromine-81. A copy of the Periodic Table is printed on page 20.
electrons
neutrons
protons
[5]
IGCSE chemistry SET X (Periodic Table-G1 & Radioactivity)
1 The table below gives some information about the elements in Group I of the Periodic Table.
(a) How does the density of the Group I elements change down the Group?
[2]
[1]
[1]
(d) Use the information in the table to suggest how fast lithium reacts with water compared
with the other Group I metals.
[1]
1.
2.
3. [3]
(i) State the name of the other product formed in this reaction.
[1]
(ii) Describe a test for hydrogen.
test
resuIt [2]
+ + +
n nn
(i) State the name of the positiveIy charged particIe in the nucIeus.
[1]
(ii) What is the name given to atoms with the same number of positive charges in the
nucIeus but different numbers of neutrons?
[1]
[1]
[1]
Total / 15
IGCSE chemistry SET X (Periodic Table & Bonding)
1 (a) The table gives some information about five elements, A, B, C, D and E.
Complete the table by writing either metal or non-metal in the last column.
[5]
[1]
[1]
(ii) Complete the equation to show what happens when a sodium atom forms a sodium
ion.
+
Na Na + [1]
(d) Complete these sentences about the properties of the Group I elements using words from the
list.
IGCSE
che
acidic basic decrease hard
mist
ry
increase lithium potassium soft
SET
X
(Peri
odic
The Group I elements are relatively metals which in Tabl
e-
reactivity going down the Group. Sodium reacts more violently with water than . Bro
mine
The Group I metals all form oxides. [4] )
Total / 12
...............................................................................................................................[1]
...............................................................................................................................[1]
(b) Bromine is obtained from the bromide ions in sea water. Sea water is concentrated by
evaporation. Chlorine gas is bubbled through the solution. Chlorine oxidises the
bromide ion to bromine.
(ii) Explain using the idea of electron transfer why the bromide ion is oxidised
by chlorine.
............................................................................................................................
....................................................................
...............................................................................................................................[2]
...............................................................................................................................[1]
PBr3 + ......H2O
......HBr + H3PO3
[1]
(ii) Describe by giving essential details how you could show that phosphorous
acid, H3PO3, is a weaker acid than hydrogen bromide.
...................................................................................................................................
...................................................................................................................................
...............................................................................................................................[2]
...............................................................................................................................[1]
...............................................................................................................................[1]
2 Calcium and other minerals are essential for healthy teeth and bones. Tablets can be taken to
provide these minerals.
Healthy
Bones
Each tablet
contains
calcium
magnesi
um zinc
copper
boron
(a) Boron is a non-metal with a macromolecular structure.
...........................................................................
...................................................................................................................................
...................................................................................................................................
structures. element ..
compound
[7]
(b) Describe the reactions, if any, of zinc and copper(II) ions with an excess of aqueous sodium
hydroxide.
....
(i) zinc ions
.....
addition of aqueous sodium hydroxide .....................................................................
.....
.....
.....
........................................................................................................... excess sodium
hydroxide ..........................................................................................
...................................................................................................................................
...................................................................................................................................
...............................................................................................................................[4]
(c) Each tablet contains the same number of moles of CaCO3 and MgCO3. One tablet
reacted with excess hydrochloric acid to produce 0.24 dm3 of carbon dioxide at r.t.p.
(i) Calculate how many moles of CaCO3 there are in one tablet.
(ii) Calculate the volume of hydrochloric acid, 1.0 mol / dm3, needed to react with
one tablet.
5 The first three elements in Period 6 of the Periodic Table of the Elements are caesium, barium
and lanthanum.
(a) How many more protons, electrons and neutrons are there in one atom of lanthanum
than in one atom of caesium. Use your copy of the Periodic Table of the Elements
to help you.
(b) All three metals can be obtained by the electrolysis of a molten halide. The electrolysis
of the aqueous halides does not produce the metal.
(i) Complete the equation for the reduction of lanthanum ions at the negative
electrode (cathode).
(ii) Name the three products formed by the electrolysis of aqueous caesium bromide.
...................................................................................................................................
...............................................................................................................................[4]
(c) All three metals react with cold water. Complete the word equation for these reactions.
(d) Barium chloride is an ionic compound. Draw a diagram that shows the formula of the
compound, the charges on the ions and gives the arrangement of the valency electrons
around the negative ion.
The electron distribution of a barium atom is 2.8.18.18.8.2
[2]
(e) Describe, by means of a simple diagram, the lattice structure of an ionic compound, such as
caesium chloride.
[2]
...................................................................................................................................
(ii) Explain using the idea of bond breaking and forming why this reaction is
exothermic.
...................................................................................................................................
...............................................................................................................................[3]
(a) (i) How does their colour change down the Group?
[1]
(ii) How does their physical state (solid, liquid or gas) change down the Group?
[1]
colour
(b) Describe how you could distinguish between aqueous potassium bromide and aqueous
potassium iodide.
test
(c) 0.015 moles of iodine react with 0.045 moles of chlorine to form 0.030 moles of a single
product. Complete the equation.
I2 + Cl2 [2]
[2]
(a) Which of the following statements about transition elements are correct?
[3]
[1]
(ii) Use the Periodic Table to work out the number of protons and the number of
neutrons in one atom of iron.
(c) Iron is extracted in a blast furnace. The list below gives some of the substances used
or formed in the extraction.
[1]
(ii) Which substance is formed when impurities in the ore react with calcium oxide?
[1]
[1]
(d) State two functions of the coke used in the blast furnace.
[2]
(e) Most of the iron is converted into mild steel or stainless steel. Give one use for each.
mild steel
4 Use your copy of the periodic table to help you answer these questions.
(c) Draw a diagram showing the arrangement of the valency electrons in one molecule of
the covalent compound nitrogen trichloride.
[2]
(e) Fluorine and astatine are halogens. Use your knowledge of the other halogens to predict the
following:
[2]
[Total 15]
1 For each of the following select an element from Period 4, potassium to krypton, that matches the
description.
[Total: 7]
IGCSE chemistry SET X (Periodic Table)
1 For each of the following unfamiliar elements predict one physical and one chemical property.
..................................................................................................................................... [2]
..................................................................................................................................... [2]
..................................................................................................................................... [2]
[Total: 6]
(b) Thallium(I) chloride is insoluble in water. Complete the description of the preparation of
a pure sample of this salt.
Step 1
Mix a solution of sodium chloride with thallium(I) sulfate solution. A white precipitate
forms.
Step 2
..................................................................................................................................... [1]
Step 3
..................................................................................................................................... [1]
Step 4
..................................................................................................................................... [1]
When thallium(I) chloride is exposed to light, a photochemical reaction occurs. It changes
from a white solid to a violet solid.
(i) Name another metal halide which changes colour when exposed to light. Give the
major use of this metal halide.
name ..........................................................................................................................
(ii) A piece of paper coated with thallium(I) chloride is exposed to a bright light.
Suggest two ways of increasing the time it takes for the violet colour to appear.
....................................................................................................................................
....................................................................................................................................
.............................................................................................................................. [2]
(d) Thallium(I) hydroxide is an alkali. It has similar properties to sodium hydroxide.
(iii) Aqueous thallium(I) hydroxide was added to aqueous iron(II) sulfate. Describe
what you would see and complete the ionic equation for the reaction.
observation ................................................................................................................
.............................................................................................................................[1]
[Total: 14]
2 Manganese is a transition element. It has more than one valency and the metal and its
compounds are catalysts.
(a) (i) Predict three other properties of manganese that are typical of transition elements.
...................................................................................................................................
...............................................................................................................................[3]
2 + 8 + .......... + 2 [1]
(ii) Which, if any, of these oxides will react with sodium hydroxide?
...............................................................................................................................[1]
(c) Aqueous hydrogen peroxide decomposes to form water and oxygen.
The following experiments were carried out to investigate the rate of this reaction.
volume of
oxygen / cm3
0
0
time / min
(i) How does the rate of reaction vary with time? Explain why the rate varies.
...................................................................................................................................
...............................................................................................................................[3]
(ii) The following experiment was carried out at the same temperature.
Sketch the curve for this experiment on the same grid. [2]
(iii) How would the shape of the graph differ if only half the mass of catalyst had been used in
these experiments?
...................................................................................................................................
...................................................................................................................................
...............................................................................................................................[2]
3 The elements in Period 3 and some of their common oxidation states are shown below.
Element Na Mg Al Si P S Cl Ar
Oxidation
State +1 +2 +3 +4 3 2 1 0
(a) (i) Why do the oxidation states increase from sodium to silicon?
...............................................................................................................................[1]
(ii) After Group(IV) the oxidation states are negative and decrease across the period.
Explain why.
...................................................................................................................................
...............................................................................................................................[2]
(b) The following compounds contain two elements. Predict their formulae.
(c) Choose a different element from Period 3 that matches each description.
...............................................................................................................................[1]
...............................................................................................................................[1]
...............................................................................................................................[1]
(d) The only oxidation state of argon is zero. Why it is used to fill light bulbs?
..........................................................................................................................................
......................................................................................................................................[1]
(e) Draw a diagram that shows the arrangement of the valency electrons in the ionic
compound sodium phosphide.
Use o to represent an electron from sodium.
Use x to represent an electron from phosphorus. [3]
2Na + S Na2S
An 11.5 g sample of sodium is reacted with 10 g of sulphur. All of the sodium reacted
but there was an excess of sulphur.
Calculate the mass of sulphur left unreacted.
5 The first three elements in Group IV are carbon, silicon and germanium.
The elements and their compounds have similar properties.
(a) The compound, silicon carbide, has a macromolecular structure similar to that of
diamond.
(i) A major use of silicon carbide is to reinforce aluminium alloys which are used in
the construction of spacecraft. Suggest three of its physical properties.
[3]
(b) Germanium(IV) oxide, GeO2, has the same macromolecular structure as silicon(IV)
oxide. Draw the structural formula of germanium(IV) oxide.
[3]
(c) Germanium forms a series of hydrides comparable to the alkanes.
(i) Draw the structural formula of the hydride which contains four germanium atoms
per molecule.
[1]
(ii) Predict the products of the complete combustion of this hydride.
[2]
[Total: 11]
10 Look at this part of the Periodic Table.
Li
Na
The names of the three elements are lithium, sodium and potassium.
Choose from
alkali metals
halogens
noble gases
transition elements
answer ............................................................................................................................
.......[1]
....................................................................
...........................................................................................................................................
...........................................................................................................................................
.......................................................................................................................................[2]
sodium ....................................
lithium red
potassium lilac
[1]
[Total: 5]
10 This question is about the halogens and their reactions.
1 ................................................................................................................................................
2 .......................................................................................................................................... [2]
..................................................
Look at the table. It shows the results from these and other experiments.
[1]
(d) Chlorine is a green gas.
Bromine is an orange
............................................................................................................................................. [1]
(e) Chlorine, bromine and iodine are all in Group 7 of the Periodic Table.
...................................................................................................................................................
............................................................................................................................................. [1]
[Total: 6]
...................................................................................................................................................
............................................................................................................................................. [2]
(b) Different flame colours are seen when compounds of the alkali metals are put into a
Bunsen flame.
lithium orange
sodium lilac
potassium red
[2]
[Total: 4]
(a) Oxygen, O2, hydrogen, H2, and water, H2O, are all molecules.
What is a molecule?
........................................................................................................................................
...........
........................................................................................................................................
.......[1]
........................................................................................................................................
.......[1]
(c) The atoms in a hydrogen molecule are bonded using a shared pair of electrons.
covalent
intermolecular
ionic
metallic
answer ...........................................................................................................................
.......[1]
(d) The elements in the Periodic Table are arranged in groups and periods.
...........................................................................................................................................
.......................................................................................................................................[1]
Explain why.
.......................................................................................................................................[1]
[Total: 5]
11 This question is about Group 1 elements.
alkali
metals
halogens
noble
gases
transition
answer ...........................................................................................................................
.......[1]
this reaction.
.......................................................................................................................................[1]
.......................................................................................................................................[1]
test.
lithium
chloride
potassium
chloride
sodium
chloride
answer ...........................................................................................................................
.......[1]
[Total: 4]
(a) The table below lists the properties of five elements. The letters used are not the symbols for the
elements.
A B D
C E
Choose from A to E:
a) A noble gas
b) A halogen
c) The most reactive metal
d) The most reactive non-metal
(4)
I II
III IV V VI VII 0
L
Q E G J Z M
R D
T
Use the Periodic Table found on the back page to help you answer these questions.
about 50
over 1000
[1]
........................................................................................................................................[1]
........................................................................................................................................[1]
........................................................................................................................................[1]
(e) Write down the name of a transition element.
........................................................................................................................................[1]
(f) Calcium, Ca, reacts with oxygen, O2, to make calcium oxide, CaO.
........................................................................................................................................[2]
[Total: 7]
........................................................................................................................................[1]
(b) Sodium and potassium are stored under oil.
Explain why.
............................................................................................................................................
........................................................................................................................................[2]
part A
electron
xx
x
x x xx
x x
xxx
...............................................................................................................................[1]
(ii) What is the charge on an electron?
Choose from
negative
neutral
positive
...............................................................................................................................[1]
[Total: 5]
substance use
[3]
(b) Chlorine and iodine are both elements in Group 7 of the Periodic Table.
You may wish to use the Periodic Table on the back page to help you.
...............................................................................................................................................[1]
Write the word equation for the reaction between sodium and chlorine.
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[Total: 5]
9 This question is about the Periodic Table and transition elements.
Na
K Ni
Ag
(a) (i) Write down the symbols for two elements that are in the same group.
(ii) Write down the symbols for two elements that are in the same period.
Look at the list. It gives the colours of some transition metal compounds.
blue grey
orange
pink
purple
[Total: 5]
11 This question is about the elements in Group 7.
Which one?
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2Na + Cl 2
2NaCl
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(c) Chlorine will react with a solution of potassium iodide to make potassium chloride.
potassium
chlorine + +
iodide
[1]
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[Total: 5]
12 This question is about Group 1 elements.
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(b) (i) Lithium, sodium and potassium all react in a similar way with water.
Explain why.
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Explain why.
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Write a symbol equation for the formation of a sodium ion from a sodium atom.
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[Total: 5]