Question

Give an example of a chemical reaction for each of the following situations : (a) a change in color is observed (b) a gas is evolved (c) sound is produced

Answer 1

when hydrogen is burnt it gives pop sound
2h+o2-2h2o
for change in colour you can give a precipitation reaction
and for evolution of gas you can give acid + carbonate. .....ok

Answer 2

Answer:

(a) Reaction between copper sulphate and iron metal

(b) Reaction between Sodium hydrogen carbonate and acetic acid

(c) Burning of crackers produces a loud sound

Explanation:

(a) Reaction between copper sulphate and iron metal – blue solution of copper sulphate changes to green solution of ferrous sulphate.

(b) Reaction between Sodium hydrogen carbonate and acetic acid – carbon dioxide gas is evolved.

(c)Burning of crackers produces a loud sound.