Question

How can you differentiate between physical and chemical changes?

Answer 1

Explanation:

Physical changeChemical changeOnly physical changes like odour, physical state, density, volume etc. changed and chemical properties remain unchangedThe chemical composition and chemical properties undergo a changeNo new substance is formed in a physical change.A new substance is formed in a physical change.Very little or no energy in the form of heat, light or sound is usually absorbed or given out in a physical changeA chemical change is always accompanied by absorption or evolution of energyIt is a temporary changeIt is a permanent changeThe original form of substance can be regained by simple physical methodOriginal substance cannot be obtained by simple physical methodIt is reversibleIt is irreversible

Answer 2

Physical changes:

Physical changes only change the appearance of a substance, not its chemical composition. A process that does not cause a substance to become a fundamentally different substance.
Some examples of physical change are freezing of water, melting of wax, boiling of water, etc. A few examples of chemical change are digestion of food, burning of coal, rusting, etc
Physical changes only change the appearance of a substance, not its chemical composition.

Chemical changes:
Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions. A process involving the breaking or making of interatomic bonds and the transformation of a substance (or substances) into another. The “ingredients” of a reaction are called reactants, and the end results are called products. A process that causes a substance to change into a new substance with a new chemical formula is known as a chemical reaction .

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