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 an example where change in physical state occurs by change in pressure
Does the physical state of a substance always change during a chemical change? Give one example in favour and one example against the statement with proper reasoning.
The interconversion of a substance from one state of matter to another is an example of ___ change (physical/chemical).