Give an example of a reaction where the following are involved
(a) Heat
(b) Light
(c) Electricity
(d) Close contact
(e) Solution
(f) Pressure
(g) Catalyst
Give an example of a reaction where the following are involved:
(a) Evolution of heat
(b) Absorption of heat
(c) High pressure is required
How do the following help in bringing about a chemical change ? Explain each with a suit able example.
(a) pressure (b) Light
(c) catalyst (d) heat.
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.
Give one example of a decomposition reaction which is carried out :
(a) with electricity
(b) by applying heat