1. Distinguish between the following pairs.
1. Physical and chemical changes
2. Endothermic and exothermic changes
3. Desirable and undesirable changes
4. Reversible and irreversible changes
5. Periodic and non-periodic changes
6. Slow and fast changes
7. Natural and man-made changes
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1. Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.
2. An exothermic process releases heat, causing the temperature of the immediate surroundings to rise. An endothermic process absorbs heat and cools the surroundings.”
3. Desirable change: The changes which are desired(need) to be change are called as desirable changes. Undesirable change: The changes which are not desired to change is called undesirable changes.
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