Question

1.Give an example of a chemical reaction for each of the following situations:
(a) A change in colour is observed.
(b) A gas is evolved.
(c) Sound is produced.
2.Complete the following reaction
Ca (OH)2 + CO2 → ………………

Answer 1

1=reaction between baking soda and vinegar

2=acid based test  using indicator,starch test, reaction between copper ,water

and carbon dioxide

3=acid based reaction

ca(oh)2+ co2=

answere is hots