Alkanes & Crude Oil quiz

1. What is the name of this molecule?

ethane

butane

pentane

propane

Question 1 of 22

2. Explain why carbon monoxide is dangerous to humans

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

It is poisonous because it blocks surfaces for gas exchange

It is poisonous because it poisons the bloodstream

It is poisonous because it blocks blood flow

Question 2 of 22

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

A fossil fuel

A fuel

A coal

An electrolyte

Question 3 of 22

4. Explain the term hydrocarbon

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

A hydrocarbon is an organic molecule

Question 4 of 22

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

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

Question 5 of 22

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

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

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

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

It is a greenhouse gas and may contribute to global warming

Question 6 of 22

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

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

Question 7 of 22

8. What is crude oil?

A mixture of alkanes

A mixture of alcohols

An oily liquid

A mixture of hydrocarbons

Question 8 of 22

9. What is produced when nitrogen reacts with oxygen?

nitrogen oxides

nitrogen and water

nitrates

nitrifying compounds

Question 9 of 22

10.

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. 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.

The student is wrong because she makes no reference to the numbers of protons and neutrons in the molecules.

Question 10 of 22

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

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

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

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

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

Question 11 of 22

12. State the general formula of alkanes

CₙH₂ₙ₊₂

C₂ₙH₂ₙ₊₂

CₙHₙ₊₁

CₙH₂ₙ

Question 12 of 22

13. 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) 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) 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

Question 13 of 22

14. 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?

empirical formula

structural formula

general formula

molecular formula

Question 14 of 22

15. Name this molecule

methyl propane

dimethyl ethane

prop-1-ene

butane

Question 15 of 22

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

Solid or liquid

Solid

Gas or liquid

Any state

Question 16 of 22

17. Explain the term saturated

A molecule that is poisonous

A molecule that is usually a solid at room temperature

A molecule containing only single bonds

A molecule that will not react with anything

Question 17 of 22

18. How does sulfur dioxide form in car engines?

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

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

When the petrol combusts the sulfur dioxide impurities are left behind

Question 18 of 22

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

Fuel oil

Kerosene

Refinery gases

Bitumen

Question 19 of 22

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

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

Question 20 of 22

21. 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 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. 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.

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.

Question 21 of 22

22. Describe how nitrogen oxides and sulfur dioxide contribute to acid rain

Nitrogen oxides created in hot car engines and sulfur dioxide released when fossil fuels are burned combine with water in lakes and seas to form acidic solutions

Nitrogen oxides created in hot car engines and sulfur dioxide released when fossil fuels are burned combine with water in the atmosphere to form acidic particles

Nitrogen oxides created in hot car engines and sulfur dioxide released when fossil fuels are burned combine with each other to form acidic solutions

Nitrogen oxides created in hot car engines and sulfur dioxide released when fossil fuels are burned combine with water in the atmosphere to form acidic solutions

Question 22 of 22

Alkanes & Crude Oil quiz

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