C1.3 Air and Combustion

 3%

Question 1 of 34

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

Question 1 of 34

Question 2 of 34

2. 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.

Question 2 of 34

Question 3 of 34

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

Question 3 of 34

Question 4 of 34

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

Question 4 of 34

Question 5 of 34

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

Question 5 of 34

Question 6 of 34

6. Mention the method of preventing rusting

Question 6 of 34

Question 7 of 34

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

Question 7 of 34

Question 8 of 34

8. Mention THE USES of oxygen

Question 8 of 34

Question 9 of 34

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

Question 9 of 34

Question 10 of 34

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

Question 10 of 34

Question 11 of 34

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

Question 11 of 34

Question 12 of 34

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

Question 12 of 34

Question 13 of 34

13. 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

Question 13 of 34

Question 14 of 34

14. 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.

Question 14 of 34

Question 15 of 34

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

Question 15 of 34

Question 16 of 34

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

Question 16 of 34

Question 17 of 34

17. Removal of oxygen from a substance is called?

Question 17 of 34

Question 18 of 34

18. 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.

Question 18 of 34

Question 19 of 34

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

Question 19 of 34

Question 20 of 34

20. 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

Question 20 of 34

Question 21 of 34

21. 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?

Question 21 of 34

Question 22 of 34

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

Question 22 of 34

Question 23 of 34

23. Define Rusting

Question 23 of 34

Question 24 of 34

24. Mention the application of reduction and oxidation

Question 24 of 34

Question 25 of 34

25. 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

Question 25 of 34

Question 26 of 34

26. Mention the part of air that supports combustion.

Question 26 of 34

Question 27 of 34

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

Question 27 of 34

Question 28 of 34

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

Question 28 of 34

Question 29 of 34

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

Question 29 of 34

Question 30 of 34

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

Question 30 of 34

Question 31 of 34

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

Question 31 of 34

Question 32 of 34

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

Question 32 of 34

Question 33 of 34

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

Question 33 of 34

Question 34 of 34

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

Question 34 of 34