Alkanes & Crude Oil quiz

1. Name the greenhouse gas released from burning hydrocabons

soot

carbon dioxide

methane

water vapour

Question 1 of 22

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

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 weak intermolecular forces that 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 2 of 22

3. Recall a use of refinery gases

Fuel for lorries

Cooking

Fuel for cars

Fuel for aeroplanes

Question 3 of 22

4. How does sulfur dioxide form in car engines?

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

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 4 of 22

5. What is crude oil?

An oily liquid

A mixture of alcohols

A mixture of hydrocarbons

A mixture of alkanes

Question 5 of 22

6. Why are alkanes classified as saturated hydrocarbons?

They are usually solids at room temperature

They do not react easily

They are toxic substances

They contain only single bonds

Question 6 of 22

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

Viscosity increases as boiling point increases

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

Viscosity increases as boiling point decreases

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

Question 7 of 22

8. Name this molecule

butane

methyl propane

dimethyl ethane

prop-1-ene

Question 8 of 22

9. 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. 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 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. Smaller molecules condense high up in the tower. Larger molecules condense low down in the tower. Then the fractions are collected.

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 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

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

Question 10 of 22

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

(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)

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

Question 11 of 22

12. A student has been asked to draw all the alkene isomers of C₄H₈ and draws the following. Which of the following statements about the student's diagram is correct?

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylpropene. However, the student has forgotten to also draw cyclobutane.

The student is wrong because the molecules labelled 1 and 2 are the same molecule, so not different isomers

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylbutene.

The displayed formulae are correct, and the names are: 1) but-1-ene 2) but-2-ene and 3) methylpropene.

Question 12 of 22

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

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Question 13 of 22

14. 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 the fuel is wet

When there is reduced fuel avaliable

Question 14 of 22

15. Explain the term hydrocarbon

A hydrocarbon is a molecule that comes from crude oil

A hydrocarbon is an organic molecule

A hydrocarbon is a molecule containing only hydrogen and carbon

A hydrocarbon is a molecule that is in a homologous series

Question 15 of 22

16. What is the name of this molecule?

ethene

ethanol

ethane

methane

Question 16 of 22

17. 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 17 of 22

18. Why is the melting point of a smaller molecule lower than that of a larger molecule?

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

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

Question 18 of 22

19. 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?

general formula

molecular formula

empirical formula

structural formula

Question 19 of 22

20. What is a fuel?

A fuel is a substance that contains chemical energy

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, when burned, releases heat energy

Question 20 of 22

21. Explain the term isomerism

Atoms with the same number of protons but different numbers of neutrons

Compounds with the same empirical formula but different molecular formulas

Molecules with the same molecular formula but with a different structure

Solutions with the same ratio of ions but different concentrations

Question 21 of 22

22. What is produced when nitrogen reacts with oxygen?

nitrates

nitrogen oxides

nitrifying compounds

nitrogen and water

Question 22 of 22

Alkanes & Crude Oil quiz

Related Posts:

Share This Story, Choose Your Platform!