Alkenes & Polymers quiz

1. 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 a molecule containing only hydrogen and carbon

A hydrocarbon is an organic molecule

Question 1 of 29

2. What is the name of this molecule?

ethene

ethanol

ethane

methane

Question 2 of 29

3. What does the following diagram represent?

The polymer polyethene

Half of the polymer polybutene

polytetrahydroethene

The repeat unit of polyhexene

Question 3 of 29

4. Would methane normally react with bromine?

Only if the pressure is greater than 2 atm

Only if the temperature is over 500⁰C

Yes (to produce bromomethane and hydrogen bromide)

No (because it is saturated)

Question 4 of 29

5. Why are alkanes classified as saturated hydrocarbons?

They are usually solids at room temperature

They do not react easily

They are toxic substances

They contain only single bonds

Question 5 of 29

6. State the temperature for the cracking of hydrocarbons

100°C

600°C

200°C

1,000°C

Question 6 of 29

7. A student names this molecule 2-ethylpentane. Which of these statements is true about the student's naming of the molecule?

The student is wrong. The correct name is 3-methylhexane.

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

The student is wrong. The correct name is 4-methylhexane.

The student is wrong. The correct name is 1-methyl-1-ethylbutane.

Question 7 of 29

8. What is a fuel?

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

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

Question 8 of 29

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

Decomposition

Polymerisation

Condensation

Synthesis

Question 9 of 29

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

Bromine water

Starch

Benedict\'s reagent

Silver nitrate

Question 10 of 29

11. 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 11 of 29

12. Which fraction of crude oil is the most viscous?

Bitumen

Kerosene

Fuel oil

Refinery gases

Question 12 of 29

13. 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?

general formula

empirical formula

molecular formula

structural formula

Question 13 of 29

14. Name this molecule

prop-1-ene

methyl propane

butane

dimethyl ethane

Question 14 of 29

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

Alkenes

Alcohols

Hydrocarbons

Alkanes

Question 15 of 29

16. State the general formula for alkenes

CₙHₙ₊₁

CₙH₂ₙ₊₂

CₙHₙ

CₙH₂ₙ

Question 16 of 29

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

The sample turns from colourless to orange.

The sample turns from brown to orange.

Nothing (the sample remains orange)

The sample turns from orange to colourless.

Question 17 of 29

18. Why does incomplete combustion occur?

When the fuel is wet

When there is reduced fuel avaliable

When there is an insufficient supply of oxygen for complete combustion

When there is an insufficient supply of water

Question 18 of 29

19. What is crude oil?

An oily liquid

A mixture of hydrocarbons

A mixture of alkanes

A mixture of alcohols

Question 19 of 29

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

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

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

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

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

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. 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. 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. Larger molecules condense high up in the tower. Smaller molecules condense low down in the tower. Then the fractions are collected.

Question 21 of 29

22. In what type of reaction is an atom or group of atoms replaced by a different atom or group of atoms?

Decomposition reaction

Substitution reaction

Addition reaction

Synthesis reaction

Question 22 of 29

23. 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 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.

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 23 of 29

24. What is the molecular formula for butene?

C₄H₈

C₆H₁₄

C₆H₁₂

C₄H₁₀

Question 24 of 29

25. Explain the term unsaturated

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

A poisonous molecule

Question 25 of 29

26. Explain the term functional group

A functional group is an atom or a group of atoms that determine the chemical properties of a compound

A functional group is an atom or a group of atoms that determine the physical properties of a compound

A functional group is a formula to show the relative quantity of different types of atom for a molecules in a homologous series. Eg CₙH₂ₙ₊₂ for alkanes

A functional group is a series of compounds with similar chemical properties, a trend in physical properties and the same general formula

Question 26 of 29

27. Write a chemical equation for the complete combustion of propane

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

Question 27 of 29

28. Recall a use of bitumen

Fuel for aeroplanes

Fuel for ships

Fuel for lorries

Surfacing roads

Question 28 of 29

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

pent-2-ene

pent-1-ene

polypentene

pent-4-ene

Question 29 of 29

Alkenes & Polymers quiz

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