Question

Give two examples of each of the following changes occurring during a chemical reaction.

1) Change of state of the reactants
2) Change of colour
3) Evolution of a gas
4) Formation of a precipitate​

Answer 1

1. NH4+HCL=NH4CL
2. Fe+CuSO4=FeSO4+Cu
3. Zn+H2SO4=ZnSO4+H2
4. AgNO3+NaCl=AgCl+NaNO3.

Answer 2

Answer:

Give one example each of a chemical reaction characterised by

1.Evolution of a gas.

2.Change in colour.

3.Formation of a precipitate.

4.Change in temperature.

5.Change in state.