Question

Give two examples each for explaining
change in state and change in colour
during a chemical reaction.​

Answer 1

Answer:

Rusting of iron

Explanation:

Rusting is an example of a chemical change. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical property of iron is that it is capable of combining with oxygen to form iron oxide, the chemical name of rust.

Answer 2

Answer:

the following changes occurring during a chemical reaction :

1) Change of state of the reactants

2)Change of colour

3)Evolution of gas

4) Formation of precipitate

1) Change of state of the reactants:

Example:

Ammonia gas reacts with hydrogen chloride gas to produce solid ammonium chloride.

NH3 + HCl ==> NH4Cl

2)Change of colour

Example:

Wehne few pices of Fe are added to the blue copper sulphate solution, the colour of the solution fades

and turns into light green due to the formation of ferrous sulphate.

Fe + CuSO4 ===> FeSO4. + Cu