Chemistry Pop Quiz (There can be >1 answer for some questions)

1. Which of the following solids will sublime when heated?

A) Iodine B) Sulphur C) Sodium chloride D) Calcium carbonate

2. Which statement provides the best evidence that shows matter exists as tiny particle moving at random?
A) If a bottle of perfume is B) A thin layer of oil is C) Air can be easily D) A drop of water is enough
opened, the smell is soon formed when a drop of oil is compressed to produce a large volume of
detected in every part of the placed on the surface of steam
room water

3. An iodine crystal is heated at room temperature and pressure. The change it undergoes is called…
A) condensation B) sublimation C) evaporation D) boiling

4. Chlorine has two isotopes, chlorine-35 and chlorine-37. Both isotopes have the same…
I mass II number of electrons III chemical properties IV physical properties
A) I and II B) II and III C) III and IV D) I and IV

5. A particle has 3e, 4p and 5n. Which of the following statements are true?
A) Its proton number is 9
B) Its nucleon number is 9
C) It carries the charge of +1
D) It is an isotope

6. Tables are often included in a chemistry report because this is easier to…
A) Make conclusions
B) Understand the aim of the experiments
C) Study relationships between item in the data
D) Use the data for drawing graphs

7. Which of the following process does not involve chemistry?

A) Manufacture of fertiliser B) Respiration C) Digestion D) Reflection of light

8. An isotopes of an element have different…

A) Proton numbers B) Numbers of protons C) Nucleon numbers D) Numbers of electrons

9. The trend from top to bottom of a Periodic Table will shows…

A) Increasing proton number
B) Increasing nucleon number
C) Increasing size of atoms
D) Increasing mass of atoms

10. Which statement about the ions of Group 17 elements is correct?

A) All ions contain more protons than neutrons
B) All ions contain an odd number of electrons
C) All the ions have seven electrons in the outer shell
D) All the ions contain more electrons than protons

11. A new element with symbol Nw is discovered. It has seven outer electrons in its atom. This atom is likely to be…
A) monoatomic B) A conductor of electricity C) Able to form positive ion D) Able to form covalent
compounds

12. The correct electron configuration of an element with proton number 16 is…
A) 2.8.6 B) 2.7.7 C) 3.8.5 D) 2.8.5

13. Hydrogen-1 and hydrogen-3 are isotopes. Number of neutrons in an atom of hydrogen-3 is 2. What is the number of
neutron in an atom of hydrogen-1?
A) 0 B) 1 C) 2 D) 3

14. Who is the scientist that arrange elements by the octave rule?
A) Antoine Lavoiser B) Lothar Meyer C) Johann W Dobereiner D) John Newlands
15. Element X is not reactive. What might be the electronic configuration for this element?
A) 2.7 B) 2.8.8 C) 2.8.1 D) 2.8

16. In the periodic table, S is put under H in the same group. If the proton number of atom H is 11, what is the electronic
configuration for atom S?
A) 2.8.1 B) 2.8.3 C) 2.8.8.1 D) 2.8.8.3

17. The first scientist to suggest the idea of an atom was…

A) Dalton B) Rutherford C) Bohr D) Democritus

18. An oxide ion and a magnesium ion are ions of two different elements. These two ions have the same…
(Proton number of Mg, 12 ; O, 8)
A) number of electrons B) number of neutrons C) number of protons D) nucleon number

19. More than 95% of the mass of an atom comes from…

A) protons only B) neutrons only C) electrons only D) protons and neutrons

20. Chlorine atoms and chloride ions…

A) are isotopes of chlorine
B) are chemically identical
C) have the same physical properties
D) have the same number of protons

21. Below symbol represents a chlorine atom.

37
Cl
17

Which of the following is true based on the symbol?

Proton number Nucleon number Number of electrons
A) 17 20 17
B) 17 17 37
C) 37 17 17
D) 17 37 17

22. Element A is located in Group 17 Period 3 in the periodic table. What is the electronic configuration for the element
A) 2.7 B) 2.8.7 C) 2.8.8.7 D) 2.8

23. The following table shows the composition of two particles M and B.
Electron Neutron Proton
M 4 6 5
B 6 5 5
It follows that P and Q…
A) are both positively charged
B) have the same nucleon number
C) have the same number of electrons
D) are particles of the same element

24. Which of the following isotopes can be used for medical treatment?
A) Cobalt-60 B) Phosphorus-32 C) Iodine-131 D) Sodium-24

25. The element with the electronic configuration of 2.8.6 …

A) is in Group 6 of the periodic table
B) has nucleon number of 16
C) has 6 valence electrons
D) has 8 neutrons
Structured Item
1. The diagram below shows the interconversion for the three state of matter, solid, liquid and gaseous state.

Solid

Process I

Liquid Gas
Process II
(a) Name process I.

(b) Define freezing point.

(c) State two changes that occur in process I.

(d) Of a gaseous state, state

i)the arrangement of particles

ii) the movement of particles

iii) the kinetic energy of the particle

(e) Name process II

(f) State two difference between both process in process II.

2. Conan left an ice cube at the table of his room for 5 minutes.

(a) State the process that occurs after 5 minutes.

(b) Define melting point.

(c) Draw the arrangement of particle in the state of matter after the process occur in the space below.

(d) Explain how does the process occurs.

(e) Given the situation above, sketch a graph to show the changes of the state of matter.

(f) In your graph, label the state of matter for all the lines drawn.

(g) In your graph, there is a period when the temperature remains constant. Why does the temperature remains constant?

(h) After another 10 minutes, Conan found out that nothing is left on the table. State why.
3. The atom of magnesium are represented as the following:
24
Mg
12

(a) From the standard representation above, state the number of … of a magnesium atom

i) nucleon number

ii) neutron

iii) proton

iv) electron

(b) Define proton.

(c) State the relative atomic mass for

i) a magnesium atom

ii) a proton

iii) a neutron

iv) an electron

(d) After a chemical reaction, magnesium donates 2 electron.

i) Why?

ii) State the type of particle after the chemical process.

iii) State the representation of the particle after the chemical process.

iv) State the number of … after the chemical process.

a) neutron

b) proton

c) electron

v) State an element that has the same number of electron with the magnesium atom that has undergone the chemical
reaction.

(e) State the electronic configuration of a magnesium atom.

(f) In the periodic table, where is the magnesium atom located?

(g) In the space below, draw the structure of a magnesium atom and a magnesium atom that has undergone a chemical process.

i) State the name of the structure above your drawing.

3.

(a) Define isotopes

(b) State an example of isotopes and its use.

(c) Based on the table below,

Element Proton number Nucleon number

W 6 12
X 6 13
Y 11 23
Z 12 24
i) Which elements are isotopes? Explain your answer.

End of questions.

Answers:

1. A 6. A, C and D 11. D 16. C 21. D

2. A 7. D 12. A 17. A 22. B
3. B 8. C 13. A 18. A 23. D
4. B 9. All options 14. B 19. D 24. All options
5. B and C 10. D 15. B and D 20. B 25. C
*Question 24:
A) Cobalt-60: radiotherapy (kill cancer cells without surgery)
B) Phosphorus-32: radiotherapy (injected into the blood stream to treat cancers
such as blood disorder-bone marrow produce too much RBC/platelet)
C) Iodine-131: treatment for thyroid disorders
D) Sodium-24: used as tracers to follow the path of sodium in a person’s body to
see if the amount consumed is enough

1.(a) freezing
(b) Freezing point is the constant temperature when liquid state changes to solid state at a constant pressure.
(c) Kinetic energy decreases and force of attraction becomes stronger.
(d)i)arranged loosely/far apart from each other
ii) moves freely and randomly iii) very high
(e) evaporation/boiling
(f) Evaporation only occurs on the surface of the liquid but boiling occurs throughout the liquid.
Evaporation occurs at any temperature below boiling point while boiling only occurs at boiling point.
2. (a) melting
(b) Melting point is the constant temperature when solid state changes to liquid state at a constant pressure.
(d) Heat energy is absorbed from the surrounding. The heat energy then converts to kinetic energy to weaken the attraction
force between particles and melting occurs.
(e) and (f) To be discussed on incoming lesson.
(g) Heat energy is absorbed to overcome the forces of attraction between particles.
(h) The water was evaporated
3.(a) i) 24 ii)12 iii)12 iv)12
(b) Protons are positively charged particle in an atom.
(c) i) 24 ii) 1 iii) 1 iv)1/1840
(d) i)To achieve stable octet electron arrangement ii) ion iii) Mg2+ iv) a) 24 b) 12 c) 10 v) Neon/Argon/(Xenon)
(e) 2.8.2 (f) In group 2 period 3 (g) To be discussed on incoming lesson.
3. (a) Isotopes are atom of the same element with different nucleon umber but same proton number.
(b) Carbon-14. Used to estimate the age of a fossil.
(c) Element W and X because they have the same number of proton but different nucleon number.