
Differentiate between physical and chemical changes.
Answer
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Hint: Everyday, we come across so many different changes in our surroundings. These changes may have one or more substances involved. Essentially the difference between a physical reaction and a chemical reaction arises due to a difference in composition.
Complete step by step answer:
Note:
Chemical changes require specific techniques to reverse back or prevent them from happening. For example, rusting of iron can be prevented by applying a layer of zinc or chromium on iron substance.
Complete step by step answer:
Physical changes | Chemical changes |
When a substance undergoes a physical change, its composition remains the same but there is rearrangement of molecules. | When a substance undergoes a chemical change, there is an entire change in its molecular composition, which results in the formation of new substances. |
A Physical change is accompanied by change in physical properties of the substance, i.e. shape, size, color, state, etc. | Chemical change is accompanied by change in both physical and chemical properties of the substance, including its composition. |
Physical changes are reversible in nature, i.e., original substance can be recovered. | Chemical changes are irreversible in nature, i.e., original substance cannot be recovered. |
Physical changes do not have formation of new substances. | Chemical change leads to formation of new substances. |
Examples- Freezing of water, melting of wax, boiling of water, cutting of paper into pieces, etc. | Examples- Rusting of iron, burning of coal, burning of magnesium ribbon, etc. |
Note:
Chemical changes require specific techniques to reverse back or prevent them from happening. For example, rusting of iron can be prevented by applying a layer of zinc or chromium on iron substance.
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