1. Which of the following is a suitable base to use in indigestion tablets?

a) Copper oxide
b) Ammonia
c) Sodium hydroxide
d) Calcium carbonate

2. What gas is released when a metal carbonate reacts with an acid such as hydrochloric acid?

a) Ethene
b) Carbon dioxide
c) Water vapour
d) Hydrogen

3. How would you test for carbon dioxide gas?

a) It explodes with a pop when a lighted splint is placed near a test-tube full of it
b) It turns universal indicator blue
c) It turns limewater milky or chalky
d) It relights a glowing splint

4. In the reaction between a hydrochloric acid solution and a metal carbonate once the acid has been no more bubbles of carbon dioxide will be observed..

5. In the reaction between hydrochloric acid and carbonate the copper chloride will be formed along with water and carbon dioxide gas.

6. Why is powdered limestone added to some lakes and rivers?

a) As a fertiliser to encourage plant growth
b) To increase the pH of the water
c) To decrease the pH of the water
d) As a food source for aquatic organisms

7. Why might some toothpastes contain metal carbonate compounds?

a) To produce carbon dioxide gas which helps to keep your teeth clean
b) To act as a mild abrasive material and to neutralise acids present in the mouth
c) To make the toothpaste more acidic which helps to clean teeth more efficiently
d) To give the toothpaste a salty taste

8. Why is a base such as calcium carbonate suitable for use in indigestion tablets and toothpastes?

a) It is non-toxic and eliminates any excess acids in the body
b) It is a corrosive base that is excellent at neutralising excess acid
c) It has a salty taste which most people find very pleasing
d) It is a strong alkali and neutralises acids present in the body very quickly

9. When a base dissolves in water it will form an .

10. Why might baking soda be helpful in relieving the pain associated with bee stings?

a) Bee stings contain acids and baking soda contains a base which will neutralise the acidic sting
b) Bee stings contain an alkali and the baking soda contains an acid which will neutralise the alkaline sting
c) Baking soda produces a cooling effect on the skin surface which helps reduce the pain from the sting
d) Baking soda is effective at killing bacteria and helps reduce the swelling asociated with bee stings