Question

what type of changes are observed during chemical reaction? ​

Answer 1

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Answer 2

Explanation:

1. the state of the reactants changes

2. the colour of the reactants may change

3. chemical composition of the reactants changes

4. evolution of heat may take place