Question 1

What term is used to describe a compound containing carbon and hydrogen only?

Accepted Answer

hydrocarbon

Question 2

Complete the sentence to describe how crude oil is formed:
Over ___1___ of years from the remains of ancient ____2____

Accepted Answer

1. millions
2. biomass

Answer

1. billions
2. fossils

Answer

1. thousands
2. plants

Answer

1. hundreds
2. dead animals

Question 3

What term is used to describe hydrocarbons that only have single bonds?

Accepted Answer

alkanes

Answer

haloalkenes

Answer

fractions

Answer

alkenes

Question 4

What are the first four alkanes?

Accepted Answer

methane, ethane, propane, butane

Answer

methane, hexane, butane, ethane

Answer

propane, methane, ethane, pentane

Answer

methane, propane, ethane, octane

Question 5

What is the general formula for the alkanes?

Accepted Answer

$	ext C_n	ext H_{2n+2}$

Answer

$	ext C_n	ext H_{2n}$

Answer

$	ext C_n	ext H_{2n+1}$

Answer

$2	ext C_n	ext H_{2n+2}$

Question 6

How does boiling point of hydrocarbons depend on the chain length?

Accepted Answer

longer the chain, higher the boiling point

Answer

shorter the chain, higher the boiling point

Answer

no relationship between the two

Question 7

How does viscosity of hydrocarbons depend on chain length?

Accepted Answer

longer the chain, higher the viscosity

Answer

no trend between the two

Answer

shorter the chain, higher the viscosity

Question 8

How does flammability hydrocarbons depend on chain length?

Accepted Answer

longer the chain, lower the flammability

Answer

no trend between the two

Answer

shorter the chain, lower the flammability

Question 9

How can the different alkanes in crude oil be separated?

Accepted Answer

fractional distillation

Answer

filtration

Answer

crystallisation

Answer

distillation

Question 10

In fractional distillation, what term is used to describe a group of hydrocarbons with similar chain lengths?

Accepted Answer

fraction

Answer

fuel section

Answer

alkane group

Answer

homologous group

Question 11

Petrol and diesel oil are produced from fractional distillation of crude oil.
Which of these is not a fuel produced from fractional distillation?

Accepted Answer

coal

Answer

heavy fuel oil

Answer

liquefied petroleum gases

Answer

kerosene

Question 12

Plastic polymers can be produced from the fractions of crude oil.
Which of these is NOT produced from crude oil fractions?

Accepted Answer

alloys

Answer

lubricants

Answer

solvents

Answer

detergents

Question 13

What term is used to describe the breaking down of a long chain hydrocarbon into smaller molecules?

Accepted Answer

cracking

Answer

reduction

Answer

decomposition

Answer

combustion

Question 14

Name two methods to carry out cracking.

Accepted Answer

steam cracking, catalytic cracking

Answer

catalytic cracking, fuel cracking

Answer

gas cracking, steam cracking

Answer

water cracking, catalytic cracking

Question 15

What are the products of cracking?

Accepted Answer

short chain alkanes and alkenes

Answer

short chains of alkenes

Answer

Long chains of alkanes and alkenes

Answer

short chains of alkanes

Question 16

What name is given to hydrocarbons with a carbon=carbon double bond?

Accepted Answer

alkenes

Answer

haloalkanes

Answer

polymers

Answer

alkanes

Question 17

What are alkenes used for?

Accepted Answer

formation of polymers

Answer

fuel

Answer

lubricants

Answer

catalysts

Question 18

Which are more reactive, alkanes or alkenes?

Accepted Answer

alkenes

Answer

neither are reactive

Answer

alkanes

Answer

equal reactivity

Question 19

How can you test for alkenes?

Accepted Answer

alkenes turn orange bromine water colourless

Answer

alkenes decolourise cobalt chloride paper

Answer

alkenes turn biuret solution lilac

Answer

alkenes turn red iodine water dark blue

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