Alkanes & Crude Oil quiz

1. Describe the problems caused by acid rain

Acid rain stimulates plant life and life in lakes. It also corrodes limestone and some metals.

Acid rain damages plant life and life in lakes. It also corrodes limestone and some metals.

Acid rain damages plant life and life in lakes. It also corrodes limestone, marble and some metals.

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

Question 1 of 22

2. What is crude oil?

An oily liquid

A mixture of alcohols

A mixture of alkanes

A mixture of hydrocarbons

Question 2 of 22

3. 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 3 of 22

4. What do each of the following state symbols represent: (s), (l), (g), (aq)

(s) - solution. (l) - liquid. (g) - gas. (aq) - water

(l) - solid. (g) - liquid. (s) - gas. (aq) - aqueous (in solution)

(s) - solid. (l) - liquid. (g) - gas. (aq) - aqueous (in solution)

(s) - solid. (l) - liquid. (g) - gas. (aq) - water

Question 4 of 22

5. State the general formula of alkanes

CₙH₂ₙ₊₂

C₂ₙH₂ₙ₊₂

CₙHₙ₊₁

CₙH₂ₙ

Question 5 of 22

6. In car engines, sparks cause the formation of some gases which contribute to acid rain. What are these gases?

carbon monoxide

oxides of sulfur

Oxides of nitrogen

refinery gases

Question 6 of 22

7. 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 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.

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 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.

Question 7 of 22

8. What is the name of this molecule?

butane

pentane

ethane

propane

Question 8 of 22

9. What is a fuel?

A fuel is a substance that is used to power vehicles

A fuel is a liquid used in electrolysis

A fuel is a substance that contains chemical energy

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

Question 9 of 22

10. Why does incomplete combustion occur?

When there is an insufficient supply of water

When there is an insufficient supply of oxygen for complete combustion

When there is reduced fuel avaliable

When the fuel is wet

Question 10 of 22

11. How does sulfur dioxide form in car engines?

Petrol includes the impurity sulfur, and when the petrol combusts some sulfur dioxide is formed

Acid rain causes some sulfur impurities to get into the car engine, and when the petrol combusts some sulfur dioxide is formed

The metals the car is made from contain some impurities of sulfur and when the engine heats up, some sulfur dioxide is formed

When the petrol combusts the sulfur dioxide impurities are left behind

Question 11 of 22

12. Why is the boiling point of a larger molecule higher than that of a smaller molecule?

Larger molecules have fewer attractions between them. These take more energy to overcome.

Larger molecules have more attractions between them. These take less energy to overcome.

Larger molecules have fewer attractions between them. These take less energy to overcome.

Larger molecules have more attractions between them. These take more energy to overcome.

Question 12 of 22

13. Recall a use of diesel

Fuel for cars

Surfacing roads

Fuel for lorries

Fuel for ships

Question 13 of 22

14. Why is carbon dioxide, CO₂ harmful to the environment?

It is a greenhouse gas and may contribute to global warming

It competes with oxygen for uptake in plants preventing them from photosynthesising

It is very slightly coloured and blocks sunlight in the atmosphere if too much builds up

It is acidic and can change the pH of fresh and salt water when dissolved

Question 14 of 22

15. Which fraction of crude oil has the lowest boiling point?

Bitumen

Kerosene

Refinery gases

Fuel oil

Question 15 of 22

16. If a substance has a simple molecular structure, what physical state might it be at room temperature?

Gas or liquid

Solid or liquid

Any state

Solid

Question 16 of 22

17. Explain the term homologous series

A homologous series is a family of compounds with 1) the same general formula 2) similar chemical properties 3) trends in their physical properties

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) the same 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

Question 17 of 22

18. Recall the products of the complete combustion of alkanes

Carbon dioxide and water

Water and oxygen

Carbon and water

Carbon monoxide and water

Question 18 of 22

19. Why are alkanes classified as saturated hydrocarbons?

They contain only single bonds

They are usually solids at room temperature

They are toxic substances

They do not react easily

Question 19 of 22

20. 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 20 of 22

21. Name this molecule

methylbutane

1,1 dimethylpropane

methylpropane

but-2-ene

Question 21 of 22

22. Explain the term hydrocarbon

A hydrocarbon is a molecule containing only hydrogen and carbon

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule that is in a homologous series

Question 22 of 22

Alkanes & Crude Oil quiz

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