Question

a chemical change may occurs by one of the following changes.a) Evolution of gas b) change of colourc) absorption of energy d) evolution of heate) change of smellGive an example for each

Answer 1

The formation of a gas is a clue tochemical changes. The bubbles of gasthat you observed form when an antacid is dropped into water is an example of change. Another clue thata chemical change has occurred is the formation of a solid.