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Chemistry Worksheet

Total questions: 80

Worksheet time: 40mins

Name
Class
Date
1.

What is the main source of energy in natural gas?

a)

carbon monoxide

b)

hydrogen

c)

methane

d)

nitrogen

2.

The structure of a compound is shown. 

Which row correctly describes the properties of the compound?

a)

A

b)

B

c)

C

d)

D

3.

Which substance is an alkane?

a)

C₂H₆

b)

C₅H₁₀

c)

C₆H₁₄

d)

C₇H₁₄

4.

What is the main component of natural gas?

a)

argon

b)

methane

c)

nitrogen

d)

oxygen

5.

The displayed structural formula of a cyclobutane molecule is shown.

Which statement about cyclobutane is correct?

a)

It has a general formula of CnH2n-2.

b)

It is a hydrocarbon.

c)

It is an alkene.

d)

It is unsaturated.

6.

Which is the main source of biofuel?

a)

crude oil

b)

natural gas

c)

plastic

d)

sugarcane

7.

Crude oil can be separated by fractional distillation because each fraction has a different

a)

boiling point.

b)

density.

c)

flammability.

d)

solubility.

8.

Which of the following is the main constituent of natural gas?

a)

ethane

b)

methane

c)

nitrogen

d)

oxygen

9.

Which equation represents the combustion of propane, C3H8?

a)

C3H8 + O2 → CO + H2O

b)

C3H8 + 2 O2 → 3 CO + H2O

c)

C3H8 + 3 O2 → CO2 + 4 H2O

d)

C3H8 + 5 O2 → 3 CO2 + 4 H2O

10.

Which of the following is the main constituent of natural gas?

a)

ethane

b)

methane

c)

nitrogen

d)

oxygen

11.

Pentadecane, C15H32 undergoes a process, forming substance Z and other products.

C15H32  →\rightarrow C10H20 + Z + H2

What is the name of this process and what is substance Z?

a)

A

b)

B

c)

C

d)

D

12.

Which type of hydrocarbon reacts rapidly with bromine and what is the colour change of the bromine?

a)

A. Alkane, brown to colourless

b)

B. Alkane, colourless to brown

c)

C. Alkene, brown to colourless

d)

D. Alkene, colourless to brown

13.

Which gas reacts with unsaturated fats to form margarine?

a)

bromine

b)

hydrogen

c)

nitrogen

d)

oxygen

14.

Which statements about a homologous series are correct?

            1          All members have the same molecular formula.

         2          All members have the same general formula.

            3          All members have the same physical properties.                 

           4          All members have similar chemical properties.

a)

1 and 3 only

b)

2 and 4 only

c)

1, 2 and 3 only

d)

1, 2, 3 and 4

15.

The diagram shows a fractionating column used in the separation of petroleum. Which row explains why fraction R is collected above fraction S?

a)

A. Boiling point of R greater than S, average molecular mass of R greater than S

b)

B. Boiling point of R greater than S, average molecular mass of R smaller than S

c)

C. Boiling point of R smaller than S, average molecular mass of R greater than S

d)

D. Boiling point of R smaller than S, average molecular mass of R smaller than S

16.

Octane is an alkane containing eight carbon atoms per molecule. What is its molecular formula?

a)

C8H14

b)

C8H16

c)

C8H18

d)

C8H20

17.

What is the main source of bioethanol?

a)

A carbon dioxide

b)

B crude oil

c)

C decayed sea animals and plants

d)

D sugarcane

18.

The structure of a compound J is shown. Which row describes J?

a)

A

b)

B

c)

C

d)

D

19.

Which reaction is an example of the cracking of an alkane?

a)

3C2H4 → C6H12

b)

C6H14 → 6C + 7H2

c)

C6H14 → C2H4 + C4H10

d)

C6H12 + H2 → C6H14

20.

Which row describes a polyunsaturated molecule?

 

a)

A. carbon to carbon, one

b)

B. carbon to carbon, multiple

c)

C. carbon to hydrogen, one

d)

D. carbon to hydrogen, multiple

21.

What type of reaction is X?

a)

addition

b)

hydrogenation

c)

neutralisation

d)

substitution

22.

The diagram shows the apparatus used for the fractional distillation of petroleum. Which statement is true?

a)

A. At each level in the column, only one compound is collected.

b)

B. The fraction collected at the bottom is the lightest in colour.

c)

C. The higher up the column, the greater the temperature.

d)

D. The smallest molecules are found at the top of the column.

23.

Which statement about a polyunsaturated vegetable oil is correct?

a)

It has double bonds between carbon and carbon atoms.

b)

It is soluble in water.

c)

It reacts with bromine in the presence of nickel catalyst to form margarine.

d)

It can undergo substitution reaction.

24.

Which statement about a polyunsaturated vegetable oil is false?

a)

It has double bonds between carbon and carbon atoms.

b)

It can undergo substitution reaction.

c)

It reacts with hydrogen the presence of nickel catalyst to form margarine.

d)

It can undergo addition reaction.

25.

The diagram below shows a fractionating column used to separate crude oil. Which of the following statements is correct?

a)

A Fraction X is in less demand than fraction Z.

b)

B Fraction X is less flammable than fraction Y.

c)

C Fraction Y has a lower boiling point than fraction Z.

d)

D Fraction Y contains molecules of larger molecular masses than fraction Z.

26.

The structures of four organic compounds are shown. Which compound(s) will not decolourise aqueous bromine?

a)

1

b)

2 and 3

c)

2 and 4

d)

1, 2 and 4

27.

Which of the following shows the structure of ethene?

a)
b)
c)
d)
28.
The first member of the alkene series is methene.
a)
True
b)
False
29.
General formula of Alkene is 
a)
CnH2n+2
b)
CnH2n
c)
CnH2n+1OH
d)
CnH2n+1COOH
30.

Which of the following is unsaturated hydrocarbon ?

a)

propane

b)

propene

c)

propanol

d)

propanoic acid

31.

Alkanes molecules are held together by

a)

metallic bonds

b)

Van der Waals forces of attraction

c)

covalent bonds

d)

ionic bonds

32.

Methane reacts with chlorine in substitution reaction. Which of these is an essential condition?

a)

An acid catalyst

b)

A low temperature

c)

UV light

d)

A low pressure

33.

Alkanes react with excess oxygen to form

a)

carbon dioxide and water

b)

salt and water

c)

carbon monoxide and soot

d)

metal hydroxide and hydrogen

34.

Possible products of INCOMPLETE combustion

a)

Carbon (C)

b)

Carbon Monoxide (CO)

c)

Carbon Dioxide (CO2)

d)

Water (H2O)

35.

If an alkene has 20 carbon atoms, how many hydrogen atoms will it have?

a)

20

b)

22

c)

40

d)

42

36.
Which of the following would have the highest melting point?
a)
C3H8
b)
C4H8
c)
C5H12
d)
C22H44
37.

A homologous series is a family of organic compounds with

a)

similar chemical properties and same general formula

b)

similar chemical properties and different general formula

c)

different chemical properties and same general formula

d)

similar physical properties and same general formula

38.

Each member of a homologous series differs from the next by a

a)

–CH2 group

b)

–CH group

c)

–CO2 group

d)

–CH4 group

39.

Each member of a homologous series differs from the next by molecular mass of

a)

12

b)

14

c)

16

d)

44

40.

Which of the following can be used to distinguish between alkanes and alkenes?

a)

add a few drops of aqueous bromine

b)

add a few drops of Universal indicator

c)

add a piece of blue litmus paper

d)

add a piece of red litmus paper

41.

Which of the following statement is correct?

a)

Alkenes can turn aqueous bromine from reddish-brown to colourless.

b)

Alkenes can turn aqueous bromine from colourless to reddish-brown.

c)

Alkanes can turn aqueous bromine from reddish-brown to colourless.

d)

Alkanes can turn aqueous bromine from colourless to reddish-brown.

42.

State the general formula for alkane

a)

CnH2n+2

b)

CnH2n

c)

CnH2n+1

d)

CnH2n-2

43.

State the general formula for alkene

a)

CnH2n+2

b)

CnH2n

c)

CnH2n+1

d)

CnH2n-2

44.

Which are the following are all alkanes?

a)

methane, ethane, propane

b)

methane, ethene, propene

c)

methene, ethene, propene

d)

ethene, propene, butene

45.

Which are the following are all alkenes?

a)

methane, ethane, propane

b)

methane, ethene, propene

c)

methene, ethene, propene

d)

ethene, propene, butene

46.

The formula for ethene is

a)

C2H4

b)

C2H6

c)

CH4

d)

C3H6

47.

The formula for propane is

a)

C2H4

b)

C2H6

c)

C3H8

d)

C3H6

48.

Alkanes react with excess oxygen to form

a)

carbon dioxide and water vapour

b)

salt and water

c)

carbon monoxide and soot

d)

metal hydroxide and hydrogen

49.

Both alkanes and alkenes are

a)

hydrocarbons

b)

alcohols

c)

saturated

d)

unsaturated

50.

An alkane is

a)

polyunsaturated

b)

polysaturated

c)

saturated

d)

unsaturated

51.

Which of the following reactions apply to alkenes only

a)

cracking

b)

substitution

c)

addition

d)

combustion

52.

Alkanes undergo substitution by chlorine only in the presence of

a)

UV light

b)

oxygen

c)

water

d)

aqueous bromine

53.

What are the conditions for cracking?

a)

solid catalyst of aluminium oxide and silicon dioxide, at 600oC

b)

nickel catalyst at 200oC

c)

nickel catalyst at 600oC

d)

solid catalyst of aluminium oxide and silicon dioxide, at 200oC

54.

Which of the following statements about cracking is not true?

a)

Cracking is the breakdown of large alkane molecules into small molecules.

b)

Cracking is used to produce fuel for motor vehicles.

c)

Cracking is used to produce H2 and alkenes.

d)

Cracking takes place in the presence of sunlight.

55.

Polyunsaturated means having many

a)

C=C bonds

b)

C-C bonds

c)

C=O bonds

d)

C-O bonds

56.

Which of the following shows the structure of ethene?

a)
b)
c)
d)
57.

Which of the following shows the structure of propene?

a)
b)
c)
d)
58.

Which of the following shows the structure of ethane?

a)
b)
c)
d)
59.

A homologous series is a family of organic compounds with

a)

similar chemical properties and same general formula

b)

similar chemical properties and different general formula

c)

different chemical properties and same general formula

d)

similar physical properties and same general formula

60.

Each member of a homologous series differs from the next by a

a)

–CH2 group

b)

–CH group

c)

–CO2 group

d)

–CH4 group

61.

Each member of a homologous series differs from the next by molecular mass of

a)

12

b)

14

c)

16

d)

44

62.

Which of the following can be used to distinguish between alkanes and alkenes?

a)

add a few drops of aqueous bromine

b)

add a few drops of Universal indicator

c)

add a piece of blue litmus paper

d)

add a piece of red litmus paper

63.

Which of the following statement is correct?

a)

Alkenes can turn aqueous bromine from reddish-brown to colourless.

b)

Alkenes can turn aqueous bromine from colourless to reddish-brown.

c)

Alkanes can turn aqueous bromine from reddish-brown to colourless.

d)

Alkanes can turn aqueous bromine from colourless to reddish-brown.

64.

State the general formula for alkane

a)

CnH2n+2

b)

CnH2n

c)

CnH2n+1

d)

CnH2n-2

65.

State the general formula for alkene

a)

CnH2n+2

b)

CnH2n

c)

CnH2n+1

d)

CnH2n-2

66.

Which are the following are all alkanes?

a)

methane, ethane, propane

b)

methane, ethene, propene

c)

methene, ethene, propene

d)

ethene, propene, butene

67.

Which are the following are all alkenes?

a)

methane, ethane, propane

b)

methane, ethene, propene

c)

methene, ethene, propene

d)

ethene, propene, butene

68.

The formula for ethene is

a)

C2H4

b)

C2H6

c)

CH4

d)

C3H6

69.

The formula for propane is

a)

C2H4

b)

C2H6

c)

C3H8

d)

C3H6

70.

Alkanes react with excess oxygen to form

a)

carbon dioxide and water vapour

b)

salt and water

c)

carbon monoxide and soot

d)

metal hydroxide and hydrogen

71.

Both alkanes and alkenes are

a)

hydrocarbons

b)

alcohols

c)

saturated

d)

unsaturated

72.

An alkane is

a)

polyunsaturated

b)

polysaturated

c)

saturated

d)

unsaturated

73.

Which of the following reactions apply to alkenes only

a)

cracking

b)

substitution

c)

addition

d)

combustion

74.

Alkanes undergo substitution by chlorine only in the presence of

a)

UV light

b)

oxygen

c)

water

d)

aqueous bromine

75.

What are the conditions for cracking?

a)

solid catalyst of aluminium oxide and silicon dioxide, at 600oC

b)

nickel catalyst at 200oC

c)

nickel catalyst at 600oC

d)

solid catalyst of aluminium oxide and silicon dioxide, at 200oC

76.

Which of the following statements about cracking is not true?

a)

Cracking is the breakdown of large alkane molecules into small molecules.

b)

Cracking is used to produce fuel for motor vehicles.

c)

Cracking is used to produce H2 and alkenes.

d)

Cracking takes place in the presence of sunlight.

77.

Polyunsaturated means having many

a)

C=C bonds

b)

C-C bonds

c)

C=O bonds

d)

C-O bonds

78.

Which of the following shows the structure of ethene?

a)
b)
c)
d)
79.

Which of the following shows the structure of propene?

a)
b)
c)
d)
80.

Which of the following shows the structure of ethane?

a)
b)
c)
d)

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