Alkenes & Polymers quiz

1. Explain what an addition polymer is

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

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 compound made from an alcohol and a carboxylic acid

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

Question 1 of 29

2. What is the name of this molecule?

butene

ethene

propene

pentene

Question 2 of 29

3. 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 a molecule that is in a homologous series

A hydrocarbon is an organic molecule

Question 3 of 29

4. What is crude oil?

An oily liquid

A mixture of alkanes

A mixture of alcohols

A mixture of hydrocarbons

Question 4 of 29

5. In the fractional distillation of crude oil, how does boiling point change as the chains get longer?

Remains constant

Increases

Decreases

Boiling point is independent of chain length

Question 5 of 29

6. 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), propane (C₃H₈), butane (C₄H₁₀), pentane (C₅H₁₂)

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

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

Question 6 of 29

7. 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?

structural formula

molecular formula

empirical formula

general formula

Question 7 of 29

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

Synthesis

Substitution

Addition

Decomposition

Question 8 of 29

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

Benedict\'s reagent

Bromine water

Silver nitrate

Starch

Question 9 of 29

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

polypentene

pent-2-ene

pent-4-ene

pent-1-ene

Question 10 of 29

11. What is a substitution reaction?

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 atom or group of atoms is added to a molecule

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

Question 11 of 29

12. 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 12 of 29

13. Name this molecule

methyl propane

prop-1-ene

dimethyl ethane

butane

Question 13 of 29

14. Recall a use of kerosene

Cooking

Fuel for cars

Fuel for aeroplanes

Fuel for lorries

Question 14 of 29

15. What is the molecular formula for butane?

C₄H₁₀

C₂H₆

C₄H₈

C₆H₁₄

Question 15 of 29

16. What is the problem with burning addition polymers to dispose of them?

They explode when burnt

They produce toxic gases when burned.

They are non-biodegradable

They are not flammable

Question 16 of 29

17. State the catalyst for the cracking of hydrocarbons

manganese (II) oxide

aluminium oxide

vanadium (V) oxide

Silica

Question 17 of 29

18. Why does incomplete combustion occur?

When there is an insufficient supply of oxygen for complete combustion

When there is an insufficient supply of water

When there is reduced fuel avaliable

When the fuel is wet

Question 18 of 29

19. When lots of these molecules have their double bond broken and they all join together into a long chain, what is the new molecule called?

polychloroethene

chloroethene

polytetrachloroethene

polychloroethane

Question 19 of 29

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

Question 20 of 29

21. 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 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. 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 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 21 of 29

22. Explain the term unsaturated

A molecule containing a carbon-carbon double or triple bond

A molecule containing only single bonds

A poisonous molecule

A compound that is a liquid at room temperature

Question 22 of 29

23. What is a fuel?

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

Question 23 of 29

24. Recall the products of the complete combustion of alkanes

Water and oxygen

Carbon monoxide and water

Carbon dioxide and water

Carbon and water

Question 24 of 29

25. When bromine is added, what happens to an alkene?

The sample turns from orange to colourless.

Nothing (the sample remains orange)

The sample turns from colourless to orange.

The sample turns from brown to orange.

Question 25 of 29

26. 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 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) methylbutene.

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

Question 26 of 29

27.

What is the functional group of an alkene?

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

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

>C-NH₂< (A carbon to nitrogen bond)

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

Question 27 of 29

28. What are isomers?

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

Solutions with the same ratio of ions but different concentrations

Molecules with the same molecular formula but with a different structure

Compounds with the same empirical formula but different molecular formulas

Question 28 of 29

29. State the general formula for alkenes

CₙHₙ

CₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ₊₁

Question 29 of 29

Alkenes & Polymers quiz

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