Alkenes & Polymers quiz

1. Why are alkanes classified as saturated hydrocarbons?

They are toxic substances

They do not react easily

They contain only single bonds

They are usually solids at room temperature

Question 1 of 29

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

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)

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

Question 2 of 29

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

Alcohols

Hydrocarbons

Alkenes

Alkanes

Question 3 of 29

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

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

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

Question 4 of 29

5. Explain the term unsaturated

A molecule containing only single bonds

A poisonous molecule

A compound that is a liquid at room temperature

A molecule containing a carbon-carbon double or triple bond

Question 5 of 29

6. Name this molecule

pent-1-ene

propane

butane

pentane

Question 6 of 29

7. What is a substance called if it, when burned, releases heat energy?

A fuel

A coal

An electrolyte

A fossil fuel

Question 7 of 29

8. Recall a use of bitumen

Fuel for aeroplanes

Surfacing roads

Fuel for ships

Fuel for lorries

Question 8 of 29

9. What is crude oil?

A mixture of alkanes

An oily liquid

A mixture of alcohols

A mixture of hydrocarbons

Question 9 of 29

10. 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. 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.

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 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.

Question 10 of 29

11. 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, 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)

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

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

Question 11 of 29

12. Crude oil contains a surplus of long chain alkanes and there is much higher demand for shorter chain alkanes. What process is used to deal with this imbalance?

Cracking

Hydrolysis

Decomposition

Electrolysis

Question 12 of 29

13. What is the name of this molecule?

ethane

ethene

ethanol

methane

Question 13 of 29

14. 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 an atoms of a group of atoms is removed from a molecule

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

Question 14 of 29

15. 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?

molecular formula

structural formula

general formula

empirical formula

Question 15 of 29

16. State the general formula for alkenes

CₙHₙ₊₁

CₙHₙ

CₙH₂ₙ₊₂

CₙH₂ₙ

Question 16 of 29

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

polyfluoroethene

tetrafluoroethene

fluoroethene

fluoroethane

Question 17 of 29

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

Fuel oil

Refinery gases

Bitumen

Kerosene

Question 18 of 29

19. Explain why carbon monoxide is dangerous to humans

It is poisonous because it blocks surfaces for gas exchange

It is poisonous because it poisons the bloodstream

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

It is poisonous because it blocks blood flow

Question 19 of 29

20. 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 20 of 29

21. What is meant by the term biodegradable?

Toxic to the environment

Able to be broken down by UV radiation

Persists in the environment

Able to be broken down by microorganisms

Question 21 of 29

22. Recall the products of the complete combustion of alkanes

Carbon monoxide and water

Carbon dioxide and water

Carbon and water

Water and oxygen

Question 22 of 29

23. What is the name of this molecule?

propene

butene

ethene

pentene

Question 23 of 29

24. State the colour change when an alkane is mixed with bromine water

Colourless to yellow

Orange to colourless

No change

Brown to yellow

Question 24 of 29

25. What else is needed for methane to react with bromine?

UV light

High temperature (above 500⁰C)

Presence of a catalyst

Low temperature (below 0⁰C)

Question 25 of 29

26. When long chain alkanes are cracked, what is produced?

Shorter chain alkanes only

Shorter chain alkenes and hydrogen

Shorter chain alkanes and alkenes

Shorter chain alkenes only

Question 26 of 29

27. Explain what a monomer is

Monomers are the products of cracking long chain alkanes

Monomers are the many small molecules (such as ethene) which add together to make a polymer

Monomers are the small molecules released in a polymerisation reaction

Monomers are the long chain molecules produced in a polymerisation reaction

Question 27 of 29

28. 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) 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

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 28 of 29

29. What does the following diagram represent?

Propene

One repeat unit of polypropene

The polymer polypropene

The formation of the polymer polypropene from the monomer propene

Question 29 of 29

Alkenes & Polymers quiz

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