Alkenes & Polymers quiz

1. Write the word equation for the reaction between methane and bromine

methane + bromine → bromomethane + hydrogen bromide

methane + bromine → dibromomethane + hydrogen bromide

methane + bromine → bromomethane + hydrogen

methane + bromine → dibromomethane + hydrogen

Question 1 of 29

2. When bromine is added, what happens to an alkane?

Nothing (the sample remains orange)

The sample turns from orange to colourless.

The sample turns from colourless to orange.

The sample turns from brown to orange.

Question 2 of 29

3. Explain what an addition polymer is

An addition polymer is a long chain alkane found in crude oil

An addition polymer is a long chain containing alternating double and single bonds

An addition polymer is a compound made from an alcohol and a carboxylic acid

An addition polymer is a large molecule made by adding many small molecules (each containing a double bond) together to form one much larger molecule

Question 3 of 29

4. Explain why cracking is an important process in the oil industry

Cracking converts long chain hydrocarbons into short chain hydrocarbons. Crude oil contains a surplus long chains. Shorter chain hydrocarbons are in less demand, e.g. petrol. Cracking also produces alkenes which are used in making polymers and ethanol.

Cracking converts long chain hydrocarbons into short chain hydrocarbons. Crude oil contains a surplus short chains. Shorter chain hydrocarbons are in less demand, e.g. petrol. Cracking also produces alkenes which are used in making polymers and ethanol.

Cracking converts long chain hydrocarbons into short chain hydrocarbons. Crude oil contains a surplus long chains. Shorter chain hydrocarbons are in greater demand, e.g. petrol. Cracking also produces alkenes which are used in making polymers and ethanol.

Cracking converts long chain hydrocarbons into short chain hydrocarbons. Crude oil contains a surplus short chains. Shorter chain hydrocarbons are in greater demand, e.g. petrol. Cracking also produces alkenes which are used in making polymers and ethanol.

Question 4 of 29

5. Why does incomplete combustion occur?

When there is reduced fuel avaliable

When the fuel is wet

When there is an insufficient supply of oxygen for complete combustion

When there is an insufficient supply of water

Question 5 of 29

6. Why are alkanes classified as saturated hydrocarbons?

They do not react easily

They are toxic substances

They are usually solids at room temperature

They contain only single bonds

Question 6 of 29

7. Explain the term unsaturated

A poisonous molecule

A compound that is a liquid at room temperature

A molecule containing a carbon-carbon double or triple bond

A molecule containing only single bonds

Question 7 of 29

8. This diagram shows one repeat unit of a polymer. Name the monomer used to make this polymer.

polychloroethene

chloroethene

chloroethane

polytetrachloroethene

Question 8 of 29

9. What does volatile mean? Which fraction of crude oil is the most volatile?

If a substance is volatile it evaporates easily. Bitumen is the most volatile fraction of crude oil.

If a substance is volatile it evaporates easily. Refinery gas is the most volatile fraction of crude oil.

If a substance is volatile it doesn\'t flow easily. Refinery gas is the most volatile fraction of crude oil.

If a substance is volatile it doesn\'t flow easily. Bitumen is the most volatile fraction of crude oil.

Question 9 of 29

10. What is the name of this molecule?

but-1-ene

prop-1-ene

pent-2-ene

but-2-ene

Question 10 of 29

11. In what type of reaction is an atom or group of atoms added to a molecule without taking anything away?

Decomposition reaction

Addition reaction

Synthesis reaction

Substitution reaction

Question 11 of 29

12. What is crude oil?

A mixture of alkanes

A mixture of hydrocarbons

An oily liquid

A mixture of alcohols

Question 12 of 29

13. What is the molecular formula for ethane?

C₄H₈

C₂H₆

C₃H₈

C₂H₄

Question 13 of 29

14. Explain the term hydrocarbon

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is a molecule containing only hydrogen and carbon

Question 14 of 29

15. State the conditions for the cracking of hydrocarbons

Manganese oxide catalyst heated to 600°C

Aluminium oxide catalyst heated to 600°C

Manganese oxide catalyst heated to 200°C

Aluminium oxide catalyst heated to 200°C

Question 15 of 29

16. State the general formula for alkenes

CₙHₙ₊₁

CₙH₂ₙ

CₙH₂ₙ₊₂

CₙHₙ

Question 16 of 29

17. Explain the term homologous series

A homologous series is a family of compounds with 1) the same general formula 2) trends in their chemical properties 3) similar physical properties

A homologous series is a family of compounds with 1) the same general formula 2) similar chemical properties 3) trends in their physical properties

A homologous series is a family of compounds with 1) a trend in general formula 2) similar chemical properties 3) the same physical properties

A homologous series is a family of compounds with 1) a trend in general formula 2) trends in their chemical properties 3) similar physical properties

Question 17 of 29

18. Recall the products of the complete combustion of alkanes

Carbon dioxide and water

Carbon monoxide and water

Water and oxygen

Carbon and water

Question 18 of 29

19. Recall a use of refinery gases

Fuel for aeroplanes

Fuel for cars

Cooking

Fuel for lorries

Question 19 of 29

20. What is a fuel?

A fuel is a substance that, when burned, releases heat energy

A fuel is a liquid used in electrolysis

A fuel is a substance that is used to power vehicles

A fuel is a substance that contains chemical energy

Question 20 of 29

21. What does the following diagram represent?

ethylbutylethane

One repeat unit of polyoct-3-ene

One repeat unit of polyoct-2-ene

The polymer oct-3-ene

Question 21 of 29

22. A student has been asked to draw all the alkene isomers of C₄H₈ and draws the following. Which of the following statements about the student's diagram is correct?

The student is wrong because the molecules labelled 1 and 2 are the same molecule, so not different isomers

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylpropene. However, the student has forgotten to also draw cyclobutane.

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylbutene.

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylpropene.

Question 22 of 29

23. Of which homologous series is >C=C< (a carbon-to-carbon double bond) the functional group?

Alkanes

Alkenes

Alcohols

Hydrocarbons

Question 23 of 29

24. A pupil has tried to write down various ways of representing ethane using: molecular formula, displayed formula, general formula, empirical formula and stuctural formula. However she has missed one out. Which one?

molecular formula

structural formula

empirical formula

general formula

Question 24 of 29

25. Explain how crude oil is separated into fractions

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature rises. Different sized fractions condense at different heights because they have different boiling points. Larger molecules condense high up in the tower. Smaller molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature falls. Different sized fractions condense at different heights because they have different boiling points. Smaller molecules condense high up in the tower. Larger molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature falls. Different sized fractions condense at different heights because they have different boiling points. Larger molecules condense high up in the tower. Smaller molecules condense low down in the tower. Then the fractions are collected.

Crude oil is separated by fractional distillation. Crude oil is heated and the oil evaporates. It then goes into the tower. As the vapours rise up the tower the temperature rises. Different sized fractions condense at different heights because they have different boiling points. Smaller molecules condense high up in the tower. Larger molecules condense low down in the tower. Then the fractions are collected.

Question 25 of 29

26. Give two reasons why addition polymers are hard to dispose of

They are inert as they have weak C-C bonds. This makes them non-biodegradeable. Also, they produce toxic gases when burned.

They are inert as they have weak C-C bonds. This makes them biodegradeable. Also, they produce toxic gases when burned.

They are inert as they have strong C-C bonds. This makes them non-biodegradeable. Also, they produce toxic gases when burned.

They are inert as they have strong C-C bonds. This makes them biodegradeable. Also, they produce toxic gases when burned.

Question 26 of 29

27. State the names and molecular formulae of the first 5 alkanes

methane (CH₄), ethane (C₂H₆), propane (C₃H₈), quatane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), tritane (C₃H₈), butane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), tritane (C₃H₈), tetrane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), propane (C₃H₈), butane (C₄H₁₀), pentane (C₅H₁₂)

Question 27 of 29

28. Name this molecule

pentane

propane

butane

pent-1-ene

Question 28 of 29

29. Bromine is added to a sample of an alkane and also to a sample of an alkene. Describe the result of each.

With the alkane, changes from colourless to orange. With the alkene, no change (stays colourless)

With the alkane, no change (stays colourless). With the alkene, changes from colourless to orange

With the alkane, no change (stays orange). With the alkene, changes from orange to colourless

With the alkane, changes from orange to colourless. With the alkene, no change (stays orange)

Question 29 of 29

Alkenes & Polymers quiz

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