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

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2. What is crude oil?

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3. Explain the term homologous series

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4.

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?

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5. Recall a use of refinery gases

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6. Why can nitrogen react with oxygen in a car engine?

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7. Explain why carbon monoxide is dangerous to humans

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8. State the general formula of alkanes

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9. Name this molecule

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

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

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12. Write the chemical equation for sulfur dioxide dissolving in water to form acid rain

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13. Explain why nitrogen gas, N₂, is a gas at room temperature

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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?

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15. Explain the term hydrocarbon

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

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

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18. How does sulfur dioxide form in car engines?

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19. What does volatile mean? Which fraction of crude oil is the most volatile?

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20. Why are alkanes classified as saturated hydrocarbons?

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21. What is the molecular formula for propane?

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

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