Give an example of a reaction where the following are involved:
(a) Evolution of heat
(b) Absorption of heat
(c) High pressure is required
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.
what is a decomposition reaction ? Give an example of a decomposition reaction. Desctribe an activity illustrate such a reaction by heating.
(a) What is meant by a substitution reaction? Give an example (with equation) of the substitution reaction of an alkane. (b) How is soap made? Write a word equation involved in soap making.