Alkenes & Polymers quiz

1. 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 colourless). With the alkene, changes from colourless to orange

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

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

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

Question 1 of 29

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

Synthesis

Condensation

Polymerisation

Decomposition

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 the problem with burning addition polymers to dispose of them?

They are not flammable

They explode when burnt

They produce toxic gases when burned.

They are non-biodegradable

Question 4 of 29

5. What is combustion?

Combustion is burning a substance, and is a reaction with oxygen

Combustion is oxidising a substance, and is a reaction with carbon

Combustion is breaking down a substance, and often occurs with heat

Combustion is dissolving a substance

Question 5 of 29

6. Recall the products of the complete combustion of alkanes

Carbon monoxide and water

Carbon and water

Carbon dioxide and water

Water and oxygen

Question 6 of 29

7. Why does incomplete combustion occur?

When there is an insufficient supply of oxygen for complete combustion

When the fuel is wet

When there is an insufficient supply of water

When there is reduced fuel avaliable

Question 7 of 29

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

Brown to yellow

Brown to colourless

Orange to colourless

Colourless to yellow

Question 8 of 29

9. What is a general formula?

A formula to determine the structure of a general series, i.e it shows which isomers are part of the general series and which aren\'t

A series of compounds with similar chemical properties and a trend in physical properties

A formula to determine the exact number of different types of atom in a molecule, e.g. C₂H₄ for ethene

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

Question 9 of 29

10. Why are alkenes classified as unsaturated hydrocarbons?

They contain a double or triple bond

They contain only single bonds

They contain only hydrogen and carbon

They contain multiple double or triple bonds

Question 10 of 29

11. State the general formula of alkanes

CₙHₙ₊₁

CₙH₂ₙ₊₂

CₙH₂ₙ

C₂ₙH₂ₙ₊₂

Question 11 of 29

12. What is the molecular formula for methane?

C₂H₆

C₃H₈

CH₄

C₂H₄

Question 12 of 29

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

Filtration

Simple distillation

Fractional distillation

Crystallisation

Question 13 of 29

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

Shorter chain alkanes only

Shorter chain alkenes and hydrogen

Shorter chain alkenes only

Shorter chain alkanes and alkenes

Question 14 of 29

15. What does the following diagram represent?

The formation of the polymer polypropene from the monomer propene

One repeat unit of polypropene

Propene

The polymer polypropene

Question 15 of 29

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

Kerosene

Fuel oil

Bitumen

Refinery gases

Question 16 of 29

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

A fossil fuel

A fuel

An electrolyte

A coal

Question 17 of 29

18. 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

Compounds with the same empirical formula but different molecular formulas

Solutions with the same ratio of ions but different concentrations

Question 18 of 29

19. 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 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) methylpropene. However, the student has forgotten to also draw cyclobutane.

Question 19 of 29

20. Recall a use of gasoline

Fuel for aeroplanes

Fuel for lorries

Fuel for cars

Cooking

Question 20 of 29

21. What is crude oil?

A mixture of hydrocarbons

A mixture of alcohols

A mixture of alkanes

An oily liquid

Question 21 of 29

22. 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?

Electrolysis

Decomposition

Hydrolysis

Cracking

Question 22 of 29

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

polypentene

pent-1-ene

pent-4-ene

pent-2-ene

Question 23 of 29

24. Would methane normally react with bromine?

Only if the pressure is greater than 2 atm

No (because it is saturated)

Only if the temperature is over 500⁰C

Yes (to produce bromomethane and hydrogen bromide)

Question 24 of 29

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

Alkenes

Hydrocarbons

Alkanes

Alcohols

Question 25 of 29

26. What is the name of this molecule?

butene

pentene

ethene

propene

Question 26 of 29

27. Explain the term saturated

A molecule that is poisonous

A molecule that is usually a solid at room temperature

A molecule containing only single bonds

A molecule that will not react with anything

Question 27 of 29

28. State the general formula for alkenes

CₙHₙ

CₙHₙ₊₁

CₙH₂ₙ₊₂

CₙH₂ₙ

Question 28 of 29

29. Name this molecule

propane

pent-1-ene

pentane

butane

Question 29 of 29

Alkenes & Polymers quiz

Alkenes & Polymers quiz

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