Alkenes & Polymers quiz

1. 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?

polychloroethene

polychloroethane

chloroethene

polytetrachloroethene

Question 1 of 29

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

If a substance is volatile it evaporates easily. Refinery gas 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 doesn\'t flow easily. Bitumen 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 2 of 29

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

Shorter chain alkanes and alkenes

Shorter chain alkenes and hydrogen

Shorter chain alkenes only

Shorter chain alkanes only

Question 3 of 29

4. What is the name of this molecule?

ethane

methane

methanol

methyl

Question 4 of 29

5. Write the word equation for the reaction between methane and bromine

methane + bromine → bromomethane + hydrogen bromide

methane + bromine → bromomethane + hydrogen

methane + bromine → dibromomethane + hydrogen

methane + bromine → dibromomethane + hydrogen bromide

Question 5 of 29

6.

What is the functional group of an alkene?

>C-NH₂< (A carbon to nitrogen bond)

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

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

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

Question 6 of 29

7. Why are alkenes classified as unsaturated hydrocarbons?

They contain multiple double or triple bonds

They contain a double or triple bond

They contain only hydrogen and carbon

They contain only single bonds

Question 7 of 29

8. 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 8 of 29

9. State the names and molecular formulae of the first 5 alkanes

methane (CH₄), ethane (C₂H₆), propane (C₃H₈), butane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), tritane (C₃H₈), tetrane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), tritane (C₃H₈), butane (C₄H₁₀), pentane (C₅H₁₂)

methane (CH₄), ethane (C₂H₆), propane (C₃H₈), quatane (C₄H₁₀), pentane (C₅H₁₂)

Question 9 of 29

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

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

Question 10 of 29

11. Recall a use of gasoline

Fuel for aeroplanes

Fuel for lorries

Fuel for cars

Cooking

Question 11 of 29

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

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

Question 12 of 29

13. 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?

Decomposition

Electrolysis

Cracking

Hydrolysis

Question 13 of 29

14. Explain the term saturated

A molecule that is poisonous

A molecule that will not react with anything

A molecule containing only single bonds

A molecule that is usually a solid at room temperature

Question 14 of 29

15. Name this molecule

butane

propane

pentane

pent-1-ene

Question 15 of 29

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

polytetrachloroethene

chloroethane

polychloroethene

chloroethene

Question 16 of 29

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

Nothing (the sample remains orange)

The sample turns from brown to orange.

The sample turns from colourless to orange.

The sample turns from orange to colourless.

Question 17 of 29

18. What is the molecular formula for ethene?

C₂H₄

C₂H₆

C₄H₈

C₄H₁₀

Question 18 of 29

19. Why does incomplete combustion occur?

When there is an insufficient supply of water

When the fuel is wet

When there is reduced fuel avaliable

When there is an insufficient supply of oxygen for complete combustion

Question 19 of 29

20. What is a substitution reaction?

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

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

Question 20 of 29

21. 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 1-methyl-1-ethylbutane.

The student is wrong. The correct name is 3-methylhexane.

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

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

Question 21 of 29

22. State the general formula for alkenes

CₙHₙ

CₙH₂ₙ

CₙH₂ₙ₊₂

CₙHₙ₊₁

Question 22 of 29

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

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

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 23 of 29

24. What is crude oil?

An oily liquid

A mixture of alkanes

A mixture of hydrocarbons

A mixture of alcohols

Question 24 of 29

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

A coal

An electrolyte

A fuel

A fossil fuel

Question 25 of 29

26. 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 26 of 29

27. Explain what a monomer is

Monomers are the small molecules released in a polymerisation reaction

Monomers are the long chain molecules produced in a polymerisation reaction

Monomers are the products of cracking long chain alkanes

Monomers are the many small molecules (such as ethene) which add together to make a polymer

Question 27 of 29

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

Crystallisation

Filtration

Simple distillation

Fractional distillation

Question 28 of 29

29. Explain the term hydrocarbon

A hydrocarbon is an organic molecule

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

Question 29 of 29

Alkenes & Polymers quiz

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