Alkanes & Crude Oil quiz

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

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

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

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

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

Question 1 of 22

2. 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) 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 2 of 22

3. What is the molecular formula for ethane?

C₂H₄

C₃H₈

C₂H₆

C₄H₈

Question 3 of 22

4. 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 4 of 22

5. What is meant by the term viscosity?

The viscosity of a fluid describes how easily it flows. Water has a low viscosity, it flows very easily. Crude oil has a higher viscosity than water, it does not flow very easily.

The viscosity of a fluid describes how easily it flows. Water has a high viscosity, it flows very easily. Crude oil has a lower viscosity than water, it does not flow very easily.

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

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

Question 5 of 22

6. Why does incomplete combustion occur?

When the fuel is wet

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

Question 6 of 22

7. Name this molecule

2-methylhexane

heptane

hex-2-ene

1,1 dimethylpentane

Question 7 of 22

8. A student names this molecule 2-ethylpentane. Which of these statements is true about the student's naming of the molecule?

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

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.

Question 8 of 22

9. What is a general formula?

A formula to show the relative quantity of different types of atom for a molecules in a homologous series. Eg CₙH₂ₙ₊₂ for alkanes

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

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

Question 9 of 22

10. What is a fuel?

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

A fuel is a substance that contains chemical energy

A fuel is a liquid used in electrolysis

A fuel is a substance that is used to power vehicles

Question 10 of 22

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

WO₃ + 3H₂ → W + 6H₂O

WO₃ + 3H₂ → W + 3H₂O

2WO₃ + 3H₂ → 2W + 6H₂O

WO₃ + 6H₂ → W + 3H₂O

Question 11 of 22

12. What is crude oil?

A mixture of alcohols

An oily liquid

A mixture of alkanes

A mixture of hydrocarbons

Question 12 of 22

13. Name the greenhouse gas released from burning hydrocabons

water vapour

methane

carbon dioxide

soot

Question 13 of 22

14. What is produced when nitrogen reacts with oxygen?

nitrates

nitrogen and water

nitrifying compounds

nitrogen oxides

Question 14 of 22

15. 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 simple molecular structure with strong intermolecular forces that 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 giant covalent structure with many strong covalent bonds which require a lot of energy to overcome

Question 15 of 22

16. Recall a use of fuel oil

Fuel for lorries

Fuel for aeroplanes

Fuel for ships

Surfacing roads

Question 16 of 22

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

Simple distillation

Filtration

Fractional distillation

Crystallisation

Question 17 of 22

18. How does sulfur dioxide form in car engines?

Petrol includes the impurity sulfur, 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

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

Question 18 of 22

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

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

C₃H₈ + 10O₂ → 3CO₂ + 8H₂O

C₃H₈ + 5O₂ → 3CO₂ + 8H₂O

C₃H₈ + 10O₂ → 3CO₂ + 4H₂O

Question 19 of 22

20. 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 less energy to overcome.

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 more energy to overcome.

Question 20 of 22

21. Why are alkanes classified as saturated hydrocarbons?

They are usually solids at room temperature

They are toxic substances

They contain only single bonds

They do not react easily

Question 21 of 22

22. Describe the problems caused by acid rain

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

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.

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

Question 22 of 22

Alkanes & Crude Oil quiz

Alkanes & Crude Oil quiz

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