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Give two examples for each of the following cases:
(a). Physical changes which are reversible.
(b). Physical changes which are not reversible.
(c). Chemical changes.
(a). Physical changes which are reversible.
(b). Physical changes which are not reversible.
(c). Chemical changes.
(a). A physical change is a change in which a substance changes its physical properties, such as shape, size, state of substance, colour, etc. It is commonly reversible, and no new substance is formed.
Examples:
(b). A substance cannot revert to its original state; its chemical properties change, and all chemical changes are irreversible.
Examples:
(c). A chemical change occurs when a substance undergoes a change in its chemical properties. New substances are produced.
Examples:
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