Alkenes & Polymers quiz

1. Recall the products of the complete combustion of alkanes

Water and oxygen

Carbon monoxide and water

Carbon dioxide and water

Carbon and water

Question 1 of 29

2. What are isomers?

Molecules with the same molecular formula but with a different structure

Atoms with the same number of protons but different numbers of neutrons

Solutions with the same ratio of ions but different concentrations

Compounds with the same empirical formula but different molecular formulas

Question 2 of 29

3. Recall a use of refinery gases

Fuel for lorries

Cooking

Fuel for cars

Fuel for aeroplanes

Question 3 of 29

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

pent-4-ene

polypentene

pent-2-ene

pent-1-ene

Question 4 of 29

5. What is crude oil?

An oily liquid

A mixture of alcohols

A mixture of hydrocarbons

A mixture of alkanes

Question 5 of 29

6. What is the name given to the type of reaction that occurs when ethane reacts with bromine under UV light

Decomposition

Synthesis

Substitution

Addition

Question 6 of 29

7. Explain the term hydrocarbon

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule containing only hydrogen and carbon

Question 7 of 29

8. Explain what an addition polymer is

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

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

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 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 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 9 of 29

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

Colourless to yellow

Orange to colourless

Brown to yellow

Brown to colourless

Question 10 of 29

11. What is the name of this molecule?

prop-1-ene

but-2-ene

but-1-ene

pent-2-ene

Question 11 of 29

12. State the general formula for alkenes

CₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ

CₙHₙ₊₁

Question 12 of 29

13. Name this molecule

2-methylpropene

butane

polybut-1-ene

but-2-ene

Question 13 of 29

14. What is the molecular formula for pentane?

C₃H₈

C₂H₆

C₅H₁₀

C₅H₁₂

Question 14 of 29

15. What is meant by the term biodegradable?

Able to be broken down by microorganisms

Able to be broken down by UV radiation

Toxic to the environment

Persists in the environment

Question 15 of 29

16. What is the name of the process in which crude oil is separated into its various components?

Fractional distillation

Simple distillation

Filtration

Crystallisation

Question 16 of 29

17. State the general formula of alkanes

C₂ₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ₊₁

CₙH₂ₙ₊₂

Question 17 of 29

18. 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 orange to colourless. With the alkene, no change (stays orange)

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

Question 18 of 29

19. What is a fuel?

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

A fuel is a substance that is used to power vehicles

A fuel is a liquid used in electrolysis

A fuel is a substance that contains chemical energy

Question 19 of 29

20. Explain the term saturated

A molecule containing only single bonds

A molecule that will not react with anything

A molecule that is usually a solid at room temperature

A molecule that is poisonous

Question 20 of 29

21. Describe the trend in boiling points of the main fractions in crude oil

Boiling point increases as the viscosity increases

Boiling point increases as the viscosity decreases

Boiling point increases as the number of carbon atoms (chain length) decreases

Boiling point increases as the number of carbon atoms (chain length) increases

Question 21 of 29

22. What does the following diagram represent?

polytetrahydroethene

The repeat unit of polyhexene

The polymer polyethene

Half of the polymer polybutene

Question 22 of 29

23. 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) methylbutene.

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

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.

Question 23 of 29

24.

What is the functional group of an alkene?

>C-C< (a carbon-to-carbon single bond)

>C=C< (a carbon-to-carbon double bond)

>C-OH< (a carbon to OH bond)

>C-NH₂< (A carbon to nitrogen bond)

Question 24 of 29

25. State the temperature for the cracking of hydrocarbons

600°C

200°C

1,000°C

100°C

Question 25 of 29

26. 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?

empirical formula

structural formula

general formula

molecular formula

Question 26 of 29

27. Explain the term unsaturated

A poisonous molecule

A molecule containing a carbon-carbon double or triple bond

A compound that is a liquid at room temperature

A molecule containing only single bonds

Question 27 of 29

28. What is an addition reaction?

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

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

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

Question 28 of 29

29. Explain why carbon monoxide is dangerous to humans

It is poisonous because it blocks surfaces for gas exchange

It is poisonous because it reduces the capacity of the blood to carry oxygen

It is poisonous because it blocks blood flow

It is poisonous because it poisons the bloodstream

Question 29 of 29

Alkenes & Polymers quiz

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