The following examples involve a change in the state by the action of _______ .
Give an example of each of the following chemical changes.
(a) A reaction involving.
(i) Change of state.
(ii) Formation of the precipitate.
(b) An exothermic and an endothermic reaction involving carbon as one of the reactants.
(c) A reaction where the colour change is noticed.
State the types of change involve when there is a change of energy by giving a proper example.