Question

With the help of an activity demonstrate how do we know that the chemical reaction has taken place?

Answer 1

Eg: Cl2+2Na---->2NaCl. By adding universal indicators we can identify the colour of reactants and products and know whether reactants are formed or not

Answer 2

1. By evolution of a gas

2. By change in colour

3. By change in temp.

4. Formation of precipitate

5. By change in state