Question
Differentiate between physical and chemical change.
Sl. No. | DifferentiatinProperty | Physical Change | Chemical Change |
1. | Explanation | In a physical change, the molecules are rearranged while their actual composition remains same. | In a chemical change, the molecular composition of a substance completely changes and a new substance is formed. |
2. | Example | Some example 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. |
3. | Reversibility | Physical change is easily reversible i.e original substance can be recovered. | Chemical change is irreversible i.e. original substance cannot be recovered. |
4. | Formation of new substance | In physical change, no new substance is formed. | A chemical change is always accompanied by one or more new substance(s). |
5. | Type of Change | Physical change is a temporary change. | Chemical change is a permanent change. |
6. | Energy Production | In a physical change, no energy is produced. | In a chemical change, energy is produced (heat, light, sound, etc.) |
7. | Absorption of Energy | Physical change involves very little to no absorption of energy. | During chemical reaction, absorption and evolution of energy takes place. |
8. | Affects | Physical change affects only physical properties i.e. shape, size, etc. | Chemical change both physical and chemical properties of the substance including its composition. |
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