Alkenes & Polymers quiz

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

A coal

A fuel

An electrolyte

A fossil fuel

Question 1 of 29

2. Explain the term hydrocarbon

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is a molecule containing only hydrogen and carbon

Question 2 of 29

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

No change

Colourless to yellow

Orange to colourless

Brown to yellow

Question 3 of 29

4. State the general formula for alkenes

CₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ

CₙHₙ₊₁

Question 4 of 29

5. What is crude oil?

A mixture of alcohols

An oily liquid

A mixture of hydrocarbons

A mixture of alkanes

Question 5 of 29

6. Why does incomplete combustion occur?

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

When the fuel is wet

Question 6 of 29

7. Name this molecule

methylbutane

but-2-ene

methylpropane

1,1 dimethylpropane

Question 7 of 29

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

High temperature (above 500⁰C)

UV light

Presence of a catalyst

Low temperature (below 0⁰C)

Question 8 of 29

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

Synthesis

Condensation

Decomposition

Polymerisation

Question 9 of 29

10. What is the name of this molecule?

ethane

pentane

propane

butane

Question 10 of 29

11. Why are alkenes classified as unsaturated hydrocarbons?

They contain a double or triple bond

They contain multiple double or triple bonds

They contain only single bonds

They contain only hydrogen and carbon

Question 11 of 29

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

polypentene

pent-4-ene

pent-2-ene

pent-1-ene

Question 12 of 29

13. 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?

molecular formula

general formula

empirical formula

structural formula

Question 13 of 29

14. What are isomers?

Solutions with the same ratio of ions but different concentrations

Compounds with the same empirical formula but different molecular formulas

Molecules with the same molecular formula but with a different structure

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

Question 14 of 29

15. What is the name of this molecule?

but-2-ene

but-1-ene

prop-1-ene

pent-2-ene

Question 15 of 29

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

Fuel oil

Refinery gases

Bitumen

Kerosene

Question 16 of 29

17. Recall all the possible products of the incomplete combustion of alkanes

Carbon monoxide, carbon dioxide and water

Carbon, carbon monoxide, carbon dioxide and water

Hydrogen, carbon monoxide and water

Carbon dioxide and water

Question 17 of 29

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

They are inert as they have strong 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 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.

Question 18 of 29

19. Recall a use of diesel

Surfacing roads

Fuel for ships

Fuel for cars

Fuel for lorries

Question 19 of 29

20.

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 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.

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

Question 20 of 29

21. Why are alkanes classified as saturated hydrocarbons?

They contain only single bonds

They do not react easily

They are usually solids at room temperature

They are toxic substances

Question 21 of 29

22. What is a substitution reaction?

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

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

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

Question 22 of 29

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

Alkanes

Alkenes

Alcohols

Hydrocarbons

Question 23 of 29

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

Simple distillation

Filtration

Fractional distillation

Crystallisation

Question 24 of 29

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

Silver nitrate

Starch

Benedict\'s reagent

Bromine water

Question 25 of 29

26. 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 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 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.

Question 26 of 29

27. State the catalyst for the cracking of hydrocarbons

aluminium oxide

vanadium (V) oxide

manganese (II) oxide

Silica

Question 27 of 29

28. What does the following diagram represent?

Propene

One repeat unit of polypropene

The formation of the polymer polypropene from the monomer propene

The polymer polypropene

Question 28 of 29

29. State the general formula of alkanes

C₂ₙH₂ₙ₊₂

CₙH₂ₙ

CₙH₂ₙ₊₂

CₙHₙ₊₁

Question 29 of 29

Alkenes & Polymers quiz

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