melting of wax is a physical reaction, because the same amount of wax exists before and after the change.
- physical reaction is a change from one state (solid or liquid or gas) to another without a changing in the chemical composition.
- It alters the form, shape or appearance of a material but does not convert the material into a new substance. examples Freezing Water, Sanding a piece of paper, Bending a paper clip, Mixing oil and vinegar etc
- both physical and chemical changes obey the law of conservation . It also entails that the mass of a substance present before a reaction should be equal to the mass obtained after the reaction.
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