Alkanes & Crude Oil quiz

1. Explain why carbon dioxide gas, CO₂, is a gas at room temperature

Carbon dioxide has a simple molecular structure with weak intermolecular forces that require little energy to overcome

Carbon dioxide has a giant covalent structure with many strong covalent bonds which require a lot of energy to overcome

Carbon dioxide has a giant covalent structure with many weak covalent bonds which require little energy to overcome

Carbon dioxide has a simple molecular structure with strong intermolecular forces that require a lot of energy to overcome

Question 1 of 22

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

Simple distillation

Crystallisation

Filtration

Fractional distillation

Question 2 of 22

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

carbon monoxide

refinery gases

oxides of sulfur

Oxides of nitrogen

Question 3 of 22

4. Name this molecule

but-2-ene

polybut-1-ene

butane

2-methylpropene

Question 4 of 22

5. Balance the following equation: WO₃ + H₂ → W + H₂O

WO₃ + 3H₂ → W + 6H₂O

WO₃ + 6H₂ → W + 3H₂O

WO₃ + 3H₂ → W + 3H₂O

2WO₃ + 3H₂ → 2W + 6H₂O

Question 5 of 22

6.

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. 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.

The student is wrong. There is another isomer called 1,2-dimethylethane.

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

Question 6 of 22

7. Recall a use for each of the 6 fractions obtained from the fractional distillation of crude oil

refinery gases=cooking; gasoline=fuel for planes; kerosene=fuel for cars; diesel=fuel for lorries; fuel oil=fuel for ships; bitumen=surfacing roads

refinery gases=cooking; gasoline=fuel for cars; kerosene=fuel for planes; diesel=fuel for ships; fuel oil=fuel for lorries; bitumen=surfacing roads

refinery gases=fuel for cars; gasoline=fuel for planes; kerosene=cooking; diesel=fuel for lorries; fuel oil=fuel for ships; bitumen=surfacing roads

refinery gases=cooking; gasoline=fuel for cars; kerosene=fuel for planes; diesel=fuel for lorries; fuel oil=fuel for ships; bitumen=surfacing roads

Question 7 of 22

8. Why are alkanes classified as saturated hydrocarbons?

They do not react easily

They are toxic substances

They are usually solids at room temperature

They contain only single bonds

Question 8 of 22

9. What is the molecular formula for hexane?

C₆H₁₀

C₆H₁₂

C₄H₈

C₆H₁₄

Question 9 of 22

10. 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 the atmosphere 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 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 each other to form acidic solutions

Question 10 of 22

11. What is crude oil?

A mixture of alkanes

A mixture of hydrocarbons

A mixture of alcohols

An oily liquid

Question 11 of 22

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

An electrolyte

A fuel

A fossil fuel

A coal

Question 12 of 22

13. Name the greenhouse gas released from burning hydrocabons

soot

methane

water vapour

carbon dioxide

Question 13 of 22

14. Why does incomplete combustion occur?

When the fuel is wet

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

Question 14 of 22

15. Explain the term hydrocarbon

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

A hydrocarbon is a molecule that comes from crude oil

Question 15 of 22

16. A pupil has tried to write down various ways of representing butane using: molecular formula, displayed formula, general formula, empirical formula and stuctural formula. However she has missed one out. Which one?

molecular formula

empirical formula

structural formula

general formula

Question 16 of 22

17. 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

When the petrol combusts the sulfur dioxide impurities are left behind

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

Question 17 of 22

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

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

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

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

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

Question 18 of 22

19. Explain the term homologous series

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

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

Question 19 of 22

20. 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 fewer attractions between them. These take less 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 more energy to overcome.

Question 20 of 22

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

Carbon monoxide, carbon dioxide and water

Hydrogen, carbon monoxide and water

Carbon, carbon monoxide, carbon dioxide and water

Carbon dioxide and water

Question 21 of 22

22. Describe the trend in viscosity of the main fractions in crude oil

Viscosity increases as boiling point decreases

Viscosity increases as the number of carbon atoms (chain length) increases

Viscosity increases as boiling point increases

Viscosity increases as the number of carbon atoms (chain length) decreases

Question 22 of 22

Alkanes & Crude Oil quiz

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