Kendhikulhudhoo School: Class Test 1 (Term 2) Grade: 9

Kendhikulhudhoo School
Class Test 1 (Term 2)

Grade: 9
Subject: Chemistry
Duration: 40 mins
Name:
Class:
Section A
There are Six questions in this paper. Answer all questions. For each question, there are four possible
answers, A, B, C and D. Choose the one you consider correct
1.
The diagram shows the fractional distillation of petroleum.
Which statements about fractions X and Y are correct?

A
B
C
D
2.
X burns more easily than Y

Yes
Yes
No
No
X has a higher boiling point than Y

Yes
No
Yes
No
Which molecule does not undergo an addition reaction with alkenes?
ammonia, NH3
bromine, Br2
hydrogen, H2
steam, H2O
Kendhikulhudhoo School/CT 1 / Term2/ Grade9A
3.
Alkanes are a homologous series of organic compounds.

Which statement about alkanes is correct?
4.
Their boiling point increases as the length of the carbon chain increases.
Their general formula is CnH2n.
They are unsaturated hydrocarbons.
They take part in addition reactions.
Methane is the first member of the alkane series of hydrocarbons. The second member is
ethane which
1. has the formula C2H4.
2. has a higher boiling point than that of methane.
3. has the same empirical formula as methane.
4. has chemical properties very similar to those of methane.
Which statements are correct?
5.
6.
1, 2 and 3
1 and 4
2 and 4
3 only
In which of the following are all the compounds members of the same homologous series?
CH4
C2H6
C3H6
CH4
C2H6
C3H8
C2H4
C3H6
C4H10
C3H4
C3H6
C3H8
The diagrams show four hydrocarbons P, Q, R and S.
Which two hydrocarbons are isomers of each other?
P and Q
P and S
Q and R
Q and S
Section B
Answer all the questions in this section in the spaces provided.

7.
Ethene is an unsaturated hydrocarbon.
(a)
What is meant by the term unsaturated?
................................................................................................... [1]
(b)
Ethene is made by the cracking of long chain hydrocarbon molecules such as C 16H34.
Construct an equation to illustrate the cracking of C 16H34, to make ethene and another
hydrocarbon as the only products.
............................................................................................................................. ........................................
................................................................................................................................................................[1]
(b)
Ethene is bubbled through aqueous bromine to form 1,2-dibromoethane.

What would you observe during the reaction?
......................................................................................[2]
(c)
Give the name of the product and the conditions needed for the reaction of ethene
with water.
........
..............................................................................................................................................[2]
(Total:6)
8.
Ethane, C2H6, and ethene, C2H4, are both gaseous hydrocarbons.
(a)
Describe how aqueous bromine can be used to distinguish between a sample of ethane
and a sample of ethene.
. [2]
(b)
Draw a dot-and-cross diagram for ethane.

You only need to draw the outer electrons of the carbon atoms.
[2]
(c)
Ethane reacts with chlorine in the presence of ultra-violet light.

Suggest a structure for a product of this reaction.
[1]
(Total:5)
3
9.
Coal, natural gas and petroleum are obtained from the ground for use as fuels.
a)
What name is used for this group of fuels?

............................................................................................................................. ....................................[1]
b) What is the main constituent in natural gas?

............................................................................................................................. .................................. [1]
c)
Petroleum is a mixture of hydrocarbons.

i)What is hydrocarbon?
............................................................................................................................. ..................................
ii) How is the mixture separated?
............................................................................................................................. ............................ [2]
d) Give the use of:

i)
ii)
Kerosene ......................................................
Bitumen
.....................................................
[2]
e) Explain how fossil fuel formed?

............................................................................................................................. .........................................
......................................................................................................................................................................
............................................................................................................................. .................................. [2]
(Total:8)

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Kendhikulhudhoo School

Class Test 1 (Term 2)

The diagram shows the fractional distillation of petroleum.

Which statements about fractions X and Y are correct?

X burns more easily than Y

X has a higher boiling point than Y

Which molecule does not undergo an addition reaction with alkenes?

Kendhikulhudhoo School/CT 1 / Term2/ Grade9A

Alkanes are a homologous series of organic compounds.

Their general formula is CnH2n.

They are unsaturated hydrocarbons.

They take part in addition reactions.

The diagrams show four hydrocarbons P, Q, R and S.

Which two hydrocarbons are isomers of each other?

Kendhikulhudhoo School/CT 1 / Term2/ Grade9A

Answer all the questions in this section in the spaces provided.

Ethene is an unsaturated hydrocarbon.

What is meant by the term unsaturated?

Ethene is bubbled through aqueous bromine to form 1,2-dibromoethane.

Ethane, C2H6, and ethene, C2H4, are both gaseous hydrocarbons.

Draw a dot-and-cross diagram for ethane.

Ethane reacts with chlorine in the presence of ultra-violet light.

Kendhikulhudhoo School/CT 1 / Term2/ Grade9A

What name is used for this group of fuels?

b) What is the main constituent in natural gas?

Petroleum is a mixture of hydrocarbons.

d) Give the use of:

e) Explain how fossil fuel formed?

Kendhikulhudhoo School/CT 1 / Term2/ Grade9A

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