Alkenes & Polymers quiz

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

Alkenes

Alcohols

Alkanes

Hydrocarbons

Question 1 of 29

2. 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 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

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

Question 2 of 29

3. What is a fuel?

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 substance that contains chemical energy

A fuel is a liquid used in electrolysis

Question 3 of 29

4. What is the name of this molecule?

but-2-ene

pent-2-ene

prop-1-ene

but-1-ene

Question 4 of 29

5. Why are alkanes classified as saturated hydrocarbons?

They contain only single bonds

They do not react easily

They are toxic substances

They are usually solids at room temperature

Question 5 of 29

6. Why are alkenes classified as unsaturated hydrocarbons?

They contain multiple double or triple bonds

They contain only single bonds

They contain only hydrogen and carbon

They contain a double or triple bond

Question 6 of 29

7. What is crude oil?

A mixture of hydrocarbons

A mixture of alcohols

An oily liquid

A mixture of alkanes

Question 7 of 29

8. 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 8 of 29

9. Recall a use of bitumen

Fuel for lorries

Surfacing roads

Fuel for aeroplanes

Fuel for ships

Question 9 of 29

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

They are non-biodegradable

They explode when burnt

They produce toxic gases when burned.

They are not flammable

Question 10 of 29

11. What does the following diagram represent?

One repeat unit of polyoct-2-ene

The polymer oct-3-ene

ethylbutylethane

One repeat unit of polyoct-3-ene

Question 11 of 29

12. Name this molecule

but-2-ene

polybut-1-ene

2-methylpropene

butane

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

pent-2-ene

polypentene

pent-4-ene

pent-1-ene

Question 14 of 29

15. Write the chemical equation for the reaction between methane and bromine

C₂H₆ + Br₂ → C₂H₄Br₂ +H₂

CH₄ + Br₂ → CH₃Br +HBr

CH₄ + Br₂ → CH₂Br₂ +H₂

C₂H₆ + Br₂ → C₂H₅Br +HBr

Question 15 of 29

16. 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 16 of 29

17. What two things can be added together to produce a dibromoalkane?

An alkane, bromine and UV light

An alkene and hydrogen bromide

An alkane and bromine

An alkene and bromine

Question 17 of 29

18. What does volatile mean? Which fraction of crude oil is the most volatile?

If a substance is volatile it doesn\'t flow easily. Bitumen is the most volatile fraction of crude oil.

If a substance is volatile it evaporates easily. Bitumen is the most volatile fraction of crude oil.

If a substance is volatile it evaporates easily. Refinery gas is the most volatile fraction of crude oil.

If a substance is volatile it doesn\'t flow easily. Refinery gas is the most volatile fraction of crude oil.

Question 18 of 29

19. State the general formula for alkenes

CₙHₙ₊₁

CₙH₂ₙ

CₙHₙ

CₙH₂ₙ₊₂

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 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 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 20 of 29

21. What is the molecular formula for butane?

C₄H₁₀

C₂H₆

C₆H₁₄

C₄H₈

Question 21 of 29

22. 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 22 of 29

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

Shorter chain alkanes only

Shorter chain alkenes and hydrogen

Shorter chain alkanes and alkenes

Shorter chain alkenes only

Question 23 of 29

24.

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. There is another isomer called 1,2-dimethylethane.

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

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

Question 24 of 29

25. Explain why carbon monoxide is dangerous to humans

It is poisonous because it blocks blood flow

It is poisonous because it poisons the bloodstream

It is poisonous because it blocks surfaces for gas exchange

It is poisonous because it reduces the capacity of the blood to carry oxygen

Question 25 of 29

26. 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 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 double and single bonds

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

Question 26 of 29

27. What is a general formula?

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

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

Question 27 of 29

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

Silver nitrate

Bromine water

Benedict\'s reagent

Starch

Question 28 of 29

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

Carbon, carbon monoxide, carbon dioxide and water

Carbon monoxide, carbon dioxide and water

Carbon dioxide and water

Hydrogen, carbon monoxide and water

Question 29 of 29

Alkenes & Polymers quiz

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