Alkenes & Polymers quiz

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

chloroethane

polychloroethene

chloroethene

polytetrachloroethene

Question 1 of 29

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

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

Question 2 of 29

3. 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 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.

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.

Question 3 of 29

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

UV light

Presence of a catalyst

High temperature (above 500⁰C)

Low temperature (below 0⁰C)

Question 4 of 29

5. What is crude oil?

A mixture of hydrocarbons

A mixture of alcohols

A mixture of alkanes

An oily liquid

Question 5 of 29

6. Describe, in terms of structure and bonding, what happens when ethene molecules are converted into poly(ethene)

Both bonds in the double bond break. Monomers join together to form a long chain. Polymer contains double and single bonds

One bond in the double bond breaks. Monomers join together to form a long chain. Polymer contains only single bonds

One bond in the double bond breaks. Monomers join together to form a short chain. Polymer contains both double and single bonds

Both bonds in the double bond break. Monomers join together to form a long chain. Polymer contains only single bonds

Question 6 of 29

7. Write a chemical equation for the cracking of decane

C₁₀H₂₂ → C₂H₄ + C₈H₁₆

C₁₀H₂₂ → C₂H₄ + C₈H₁₈

C₁₀H₂₀ → C₂H₄ + C₈H₁₆

C₁₀H₂₀ → C₂H₄ + C₈H₁₈

Question 7 of 29

8. Name this molecule

1,1 dimethylpropane

methylbutane

methylpropane

but-2-ene

Question 8 of 29

9. What is the molecular formula for ethene?

C₂H₄

C₄H₁₀

C₂H₆

C₄H₈

Question 9 of 29

10. State the general formula for alkenes

CₙHₙ

CₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ₊₁

Question 10 of 29

11. 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 11 of 29

12.

What is the functional group of an alkene?

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

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

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

>C-NH₂< (A carbon to nitrogen bond)

Question 12 of 29

13. What is an addition reaction?

A reaction where an atom or group of atoms is added to a molecule without taking anything away

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

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

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

Question 13 of 29

14. Explain the term hydrocarbon

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that is in a homologous series

A hydrocarbon is a molecule containing only hydrogen and carbon

A hydrocarbon is a molecule that comes from crude oil

Question 14 of 29

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

Crystallisation

Filtration

Fractional distillation

Simple distillation

Question 15 of 29

16. In the fractional distillation of crude oil, how does viscosity change as the chains get longer?

Decreases

Increases

Remains constant

Viscosity is independent of chain length

Question 16 of 29

17.

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 correct and deserves a tuck-shop voucher.

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.

Question 17 of 29

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

The sample turns from orange to colourless.

The sample turns from brown to orange.

Nothing (the sample remains orange)

The sample turns from colourless to orange.

Question 18 of 29

19. 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 19 of 29

20. Recall a use of refinery gases

Fuel for aeroplanes

Fuel for cars

Fuel for lorries

Cooking

Question 20 of 29

21. What does the following diagram represent?

ethylbutylethane

One repeat unit of polyoct-2-ene

The polymer oct-3-ene

One repeat unit of polyoct-3-ene

Question 21 of 29

22. Explain the term unsaturated

A compound that is a liquid at room temperature

A poisonous molecule

A molecule containing only single bonds

A molecule containing a carbon-carbon double or triple bond

Question 22 of 29

23. What is a fuel?

A fuel is a substance that contains chemical energy

A fuel is a substance that is used to power vehicles

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

A fuel is a liquid used in electrolysis

Question 23 of 29

24. Explain the term saturated

A molecule that is usually a solid at room temperature

A molecule containing only single bonds

A molecule that is poisonous

A molecule that will not react with anything

Question 24 of 29

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

Starch

Bromine water

Benedict\'s reagent

Silver nitrate

Question 25 of 29

26. Explain the term homologous series

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) a trend in general formula 2) similar chemical properties 3) the same physical properties

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) the same general formula 2) similar chemical properties 3) trends in their physical properties

Question 26 of 29

27. What is the name of this molecule?

methane

pentane

hexane

heptane

Question 27 of 29

28. What is meant by the term biodegradable?

Persists in the environment

Able to be broken down by microorganisms

Toxic to the environment

Able to be broken down by UV radiation

Question 28 of 29

29. State the general formula of alkanes

CₙH₂ₙ₊₂

C₂ₙH₂ₙ₊₂

CₙH₂ₙ

CₙHₙ₊₁

Question 29 of 29

Alkenes & Polymers quiz

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