Question

Write down the observations which indicate the occurence of a chemical reaction .

Answer 1

Answer:

The observations which indicates the occurrence of chemical reactions are following -

1. Change in state

2. change in colour

3. evolution of a gas

4. Change in temperature

I hope it will help you.

thanks

Answer 2

Answer:

Explanation:THERE WILL BE HEAT RELEASED COLOUR CHANGE EVALUTION OF GAS