Alkenes & Polymers quiz

1. 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 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 1 of 29

2. What is the problem with burning addition polymers to dispose of them?

They explode when burnt

They are non-biodegradable

They produce toxic gases when burned.

They are not flammable

Question 2 of 29

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

Benedict\'s reagent

Bromine water

Starch

Silver nitrate

Question 3 of 29

4. 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 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.

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 4 of 29

5. Recall the products of the complete combustion of alkanes

Water and oxygen

Carbon monoxide and water

Carbon and water

Carbon dioxide and water

Question 5 of 29

6. State the general formula for alkenes

CₙH₂ₙ₊₂

CₙHₙ₊₁

CₙHₙ

CₙH₂ₙ

Question 6 of 29

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

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

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

Question 7 of 29

8. What does the following diagram represent?

polybut-1-ene

but-1-ene

but-2-ene

polybut-2-ene

Question 8 of 29

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

polychloroethene

chloroethane

polytetrachloroethene

chloroethene

Question 9 of 29

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

Alkenes

Alcohols

Hydrocarbons

Alkanes

Question 10 of 29

11. What are isomers?

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

Molecules with the same molecular formula but with a different structure

Question 11 of 29

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

Filtration

Fractional distillation

Simple distillation

Crystallisation

Question 12 of 29

13. What is crude oil?

A mixture of hydrocarbons

A mixture of alkanes

A mixture of alcohols

An oily liquid

Question 13 of 29

14. State the general formula of alkanes

CₙH₂ₙ

CₙH₂ₙ₊₂

CₙHₙ₊₁

C₂ₙH₂ₙ₊₂

Question 14 of 29

15. Name this molecule

butane

polybut-1-ene

2-methylpropene

but-2-ene

Question 15 of 29

16. What is the name given to the type of reaction that occurs when ethane reacts with bromine under UV light

Decomposition

Addition

Synthesis

Substitution

Question 16 of 29

17. Why are alkenes classified as unsaturated hydrocarbons?

They contain only hydrogen and carbon

They contain only single bonds

They contain multiple double or triple bonds

They contain a double or triple bond

Question 17 of 29

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

An electrolyte

A coal

A fossil fuel

A fuel

Question 18 of 29

19. What is the molecular formula for pentane?

C₅H₁₀

C₅H₁₂

C₃H₈

C₂H₆

Question 19 of 29

20. Explain the term saturated

A molecule that is poisonous

A molecule that will not react with anything

A molecule that is usually a solid at room temperature

A molecule containing only single bonds

Question 20 of 29

21. Recall the names of the main fractions obtained from crude oil, in order of lowest boiling point first

Refinery gases, gasoline, diesel, kerosene, fuel oil and bitumen

Refinery gases, gasoline, naptha, diesel, fuel oil and bitumen

Refinery gases, gasoline, kerosene, diesel, fuel oil and bitumen

Refinery gases, gasoline, diesel, naptha, fuel oil and bitumen

Question 21 of 29

22. What is the name of this molecule?

but-2-ene

pent-2-ene

prop-1-ene

but-1-ene

Question 22 of 29

23. When bromine is added, what happens to an alkene?

The sample turns from orange to colourless.

Nothing (the sample remains orange)

The sample turns from brown to orange.

The sample turns from colourless to orange.

Question 23 of 29

24. 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 correct and deserves a tuck-shop voucher.

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

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

Question 24 of 29

25. What is meant by the term viscosity?

The viscosity of a fluid is how easily it evaporates. Refinery gases evaporate easily, they have high viscosities

The viscosity of a fluid describes how easily it flows. Water has a high viscosity, it flows very easily. Crude oil has a lower viscosity than water, it does not flow very easily.

The viscosity of a fluid describes how easily it flows. Water has a low viscosity, it flows very easily. Crude oil has a higher viscosity than water, it does not flow very easily.

The viscosity of a fluid is how easily it evaporates. Refinery gases evaporate easily, they have low viscosities

Question 25 of 29

26. Write a chemical equation for the cracking of decane

C₁₀H₂₀ → C₂H₄ + C₈H₁₈

C₁₀H₂₀ → C₂H₄ + C₈H₁₆

C₁₀H₂₂ → C₂H₄ + C₈H₁₈

C₁₀H₂₂ → C₂H₄ + C₈H₁₆

Question 26 of 29

27. Why does incomplete combustion occur?

When there is an insufficient supply of oxygen for complete combustion

When there is reduced fuel avaliable

When there is an insufficient supply of water

When the fuel is wet

Question 27 of 29

28. 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 that comes from crude oil

A hydrocarbon is a molecule containing only hydrogen and carbon

Question 28 of 29

29. 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?

structural formula

molecular formula

empirical formula

general formula

Question 29 of 29

Alkenes & Polymers quiz

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