Alkenes & Polymers quiz

1. Why are alkanes classified as saturated hydrocarbons?

They are usually solids at room temperature

They contain only single bonds

They are toxic substances

They do not react easily

Question 1 of 29

2. What is the name of this molecule?

ethene

pentene

propene

butene

Question 2 of 29

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

Shorter chain alkenes only

Shorter chain alkenes and hydrogen

Shorter chain alkanes only

Shorter chain alkanes and alkenes

Question 3 of 29

4. 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. 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. 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 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 4 of 29

5.

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. The molecule on the right is just normal butane. Bending the end round doesn't change that.

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

The student is wrong because she makes no reference to the numbers of protons and neutrons in the molecules.

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

Question 5 of 29

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

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

Question 6 of 29

7. State the general formula for alkenes

CₙHₙ₊₁

CₙH₂ₙ₊₂

CₙHₙ

CₙH₂ₙ

Question 7 of 29

8. 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 atom or group of atoms is added to a molecule

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

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

Question 8 of 29

9. 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 9 of 29

10. Why does incomplete combustion occur?

When there is reduced fuel avaliable

When the fuel is wet

When there is an insufficient supply of water

When there is an insufficient supply of oxygen for complete combustion

Question 10 of 29

11. Name this molecule

methylbutane

but-2-ene

methylpropane

1,1 dimethylpropane

Question 11 of 29

12. 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 12 of 29

13. 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 long chain containing alternating double and single bonds

An addition polymer is a compound made from an alcohol and a carboxylic acid

Question 13 of 29

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

An electrolyte

A coal

A fuel

A fossil fuel

Question 14 of 29

15. 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 15 of 29

16. 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 orange to colourless. With the alkene, no change (stays orange)

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

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

Question 16 of 29

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

tetrafluoroethene

polyfluoroethene

fluoroethane

fluoroethene

Question 17 of 29

18. Recall a use of refinery gases

Fuel for cars

Fuel for aeroplanes

Cooking

Fuel for lorries

Question 18 of 29

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

Bitumen

Kerosene

Fuel oil

Refinery gases

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 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 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. 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

structural formula

empirical formula

molecular formula

Question 21 of 29

22. What is crude oil?

A mixture of alcohols

A mixture of hydrocarbons

A mixture of alkanes

An oily liquid

Question 22 of 29

23. 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 23 of 29

24. 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?

polychloroethane

polytetrachloroethene

chloroethene

polychloroethene

Question 24 of 29

25. Explain the term hydrocarbon

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is a molecule containing only hydrogen and carbon

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that comes from crude oil

Question 25 of 29

26.

What is the functional group of an alkene?

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

>C-NH₂< (A carbon to nitrogen bond)

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

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

Question 26 of 29

27. What are the two products of the reaction between methane and bromine? (2)

Bromomethane (CH₃Br) and hydrogen bromide (HBr)

Bromoethane (C₂H₅Br) and hydrogen bromide (HBr)

Bromomethane (CH₃Br) and hydrogen (H₂)

Bromoethane (C₂H₅Br) and hydrogen (H₂)

Question 27 of 29

28. What is produced when an alkene reacts with bromine?

A dibromoalkane

A bromoalkane and hydrogen bromide

A dibromoalkane and hydrogen

A dibromoalkene and hydrogen bromide

Question 28 of 29

29. What is the name of this molecule?

butane

propane

propene

butene

Question 29 of 29

Alkenes & Polymers quiz

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