Alkenes & Polymers quiz

1. What is crude oil?

A mixture of alkanes

An oily liquid

A mixture of hydrocarbons

A mixture of alcohols

Question 1 of 29

2. State the general formula for alkenes

CₙHₙ

CₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ₊₁

Question 2 of 29

3. What is the process of joining monomers together called?

Polymerisation

Synthesis

Condensation

Decomposition

Question 3 of 29

4. 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 4 of 29

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

structural formula

general formula

molecular formula

empirical formula

Question 5 of 29

6. 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) a trend in general formula 2) trends in their chemical properties 3) similar 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) the same general formula 2) similar chemical properties 3) trends in their physical properties

Question 6 of 29

7. Why does incomplete combustion occur?

When there is reduced fuel avaliable

When the fuel is wet

When there is an insufficient supply of water

When there is an insufficient supply of oxygen for complete combustion

Question 7 of 29

8. What is a fuel?

A fuel is a substance that is used to power vehicles

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 contains chemical energy

Question 8 of 29

9. 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 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.

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 less demand, e.g. petrol. Cracking also produces alkenes which are used in making polymers and ethanol.

Question 9 of 29

10. Explain the term saturated

A molecule that is usually a solid at room temperature

A molecule containing only single bonds

A molecule that will not react with anything

A molecule that is poisonous

Question 10 of 29

11.

A student has been asked to draw all the alkene isomers of C₄H₁₀ and draws the following. Which of the following statements about the student's diagram is correct?

The student is wrong. There is another isomer called 1,2-dimethylethane.

The student is wrong because she makes no reference to the numbers of protons and neutrons in the molecules.

The student is wrong. The molecule on the right is just normal butane. Bending the end round doesn't change that.

The student is correct and deserves a tuck-shop voucher.

Question 11 of 29

12. Name this molecule

but-2-ene

polybut-1-ene

2-methylpropene

butane

Question 12 of 29

13. What is the molecular formula for ethane?

C₄H₈

C₃H₈

C₂H₄

C₂H₆

Question 13 of 29

14. State the conditions for the cracking of hydrocarbons

Aluminium oxide catalyst heated to 600°C

Manganese oxide catalyst heated to 600°C

Aluminium oxide catalyst heated to 200°C

Manganese oxide catalyst heated to 200°C

Question 14 of 29

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

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 weak 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 15 of 29

16. Explain the term hydrocarbon

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is a molecule containing only hydrogen and carbon

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that is in a homologous series

Question 16 of 29

17. Recall the products of the complete combustion of alkanes

Carbon dioxide and water

Carbon and water

Water and oxygen

Carbon monoxide and water

Question 17 of 29

18. What is used to test if something is an alkane or and alkene?

Silver nitrate

Benedict\'s reagent

Bromine water

Starch

Question 18 of 29

19. State the colour change in the reaction of an alkene with bromine water

Brown to colourless

Brown to yellow

Colourless to yellow

Orange to colourless

Question 19 of 29

20. What does the following diagram represent?

polybut-2-ene

but-2-ene

but-1-ene

polybut-1-ene

Question 20 of 29

21. What is an addition reaction?

A reaction where an atom or group of atoms is added to a molecule without taking anything away

A reaction where an atom or group of atoms is replaced by a different atom or group of atoms

A reaction where a double bond breaks to form a long chain of molecules

A reaction where an atoms of a group of atoms is removed from a molecule

Question 21 of 29

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

polytetrachloroethene

chloroethene

chloroethane

polychloroethene

Question 22 of 29

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

Alkenes

Alkanes

Alcohols

Hydrocarbons

Question 23 of 29

24. State the general formula of alkanes

CₙH₂ₙ

CₙH₂ₙ₊₂

C₂ₙH₂ₙ₊₂

CₙHₙ₊₁

Question 24 of 29

25. Why are alkenes classified as unsaturated hydrocarbons?

They contain a double or triple bond

They contain multiple double or triple bonds

They contain only hydrogen and carbon

They contain only single bonds

Question 25 of 29

26. What are the two products of the reaction between methane and bromine? (2)

Bromoethane (C₂H₅Br) and hydrogen bromide (HBr)

Bromomethane (CH₃Br) and hydrogen bromide (HBr)

Bromoethane (C₂H₅Br) and hydrogen (H₂)

Bromomethane (CH₃Br) and hydrogen (H₂)

Question 26 of 29

27. Recall a use of fuel oil

Surfacing roads

Fuel for aeroplanes

Fuel for ships

Fuel for lorries

Question 27 of 29

28. Which fraction of crude oil has the lowest boiling point?

Refinery gases

Kerosene

Fuel oil

Bitumen

Question 28 of 29

29. What is the name of this molecule?

butene

propene

pentene

ethene

Question 29 of 29

Alkenes & Polymers quiz

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