C1.5 Water and Hydrogen

1. Which metal reacts explosively when placed in water and forms a silvery ball that moves rapidly and a purple flame?

2. Hydrogen gas is less dense than air hence it can be collected by upward delivery or downward displacement of air

3. Why can’t Magnesium be used for the Lab preparation of hydrogen gas in reaction with dilute acids?

4. What happens when hydrogen gas is passed over heated copper (II) oxide and heated Lead (II) oxide and heated Iron (II) oxide?

5. Mention the uses of hydrogen

6. How does water react with metals?

7. Mention the properties of Hydrogen gas

8. What products are formed when a candle burns in air?

9. When organic matter such as hydrocarbons burns in air carbon (IV) oxide and water are produced True or False

10. During the production of hydrogen gas by adding Zinc granules to hydrochloric acid, why is the wet hydrogen gas passed through anhydrous calcium chloride?

11. How does a metal react with steam?

12. Which of the following statement about Hydrogen is CORRECT?

13. Why are Potassium, Sodium, Lithium, and Calcium not used for Lab preparation of hydrogen gas in reaction with dilute acids?

14. What is observed when water is passed through white anhydrous copper (II) sulphate?

15. Why is Aluminum not used for Lab preparation of hydrogen gas in the preparation of hydrogen gas in reaction with dilute acids?

16. What happens when Hydrogen burns in air?