C1.3 Air and Combustion

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1. Name the method used to prevent rusting where a more reactive metal such as Zinc or Magnesium is attached to the iron structure so that the more reactive metal can corrode instead of iron.

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2. The presence of water and oxygen are necessary for iron to rust. True or False

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3. When most reactive metals such as Potassium, Sodium, Calcium, and Manganese burn in oxygen they form Metal oxides i.e. Sodium + Oxygen = Sodium oxide True or False

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4. What is the difference when a substance burns in air and when it burns-in Oxygen?

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5. Mention the application of reduction and oxidation

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6. Mention the experiment used to determine the proportion of air that supports combustion.

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7. Which of the following statement about burning a candle in an enclosed gas jar to determine the proportion of air that supports combustion is TRUE?

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8. When you heat copper in the presence of air it turns from what color to which one

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9. Mention the part of air that supports combustion.

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10. Mention the causes of experimental error in the burning candle experiment which makes its result not the same as the theoretical value of the percentage of oxygen in the air.

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11. Mention the possible sources of error in heating copper in a fixed volume of air experiment.

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12. When a metal oxide loses oxygen it is said to have been

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13. Name the 2 common methods of preparing oxygen in the laboratory.

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14. Why is sodium hydroxide preferred to water in the burning candle experiment?

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15. Removal of oxygen from a substance is called?

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16. What is the theoretical percentage of nitrogen in the air?

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17. When most reactive metals such as Potassium, Sodium, Calcium, and Manganese burn with Nitrogen they form Metal Nitrides i.e. Sodium + Nitrogen = Sodium Nitride True or False

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18. When a metal gains oxygen from another metal oxide it is said to have been

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19. Mention THE USES of oxygen

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20. How do elements compete for combined Oxygen? E.g. how comes Magnesium removes combined oxygen in Copper (II) oxide to form Magnesium Oxide. Mg + CuO= MgO + Cu.

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21. A substance such as Manganese (IV) oxide that alters the rate of the chemical reaction is known as:

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22. Which of the following is not a deliquescent substance?

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23. Mention the gases produced during the fractional distillation of liquefied air.

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24. The reaction in which elements combine with oxygen is referred to as:

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25. Substances that absorb moisture from the air to form a solution are called?

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26. Air is a mixture of gases such as oxygen, nitrogen, and carbon (IV) oxide and water vapor. True or False

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27. Explain the reason behind why gaseous substance when they burn in oxygen, their product has a decrease in mass i.e. carbon + oxygen + carbon (IV) oxide

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28. Which part of the air slows down the rate of burning?

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29. What happens when non-metallic elements such as Sulphur, Carbon and Phosphorous burn-in Oxygen? They form Oxides

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30. Define Rusting

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31. What is the theoretical percentage of carbon (IV) oxide in the air?

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32. Mention the method of preventing rusting

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33. Is there a change in mass when a substance burns in air? e.g. magnesium burning with oxygen to give magnesium oxide

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Question 34 of 34

34. What is the theoretical percentage of oxygen in the atmosphere?

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