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प्रश्न
Differentiate between a physical change and a chemical change with reference to – Energy change taking place during the respective change.
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उत्तर
| Physical change | Chemical change |
| Generally, energy is neither absorbed nor released during the change. | Generally, energy is either absorbed or evolved during change. |
| Example: Melting of ice, melting of the wax. | Example: Change of milk into curd and burning of a candle. |
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Dissolving common salt in water.
Tick the most appropriate answer
2. Melting of ice is a
- reversible change
- irreversible change
- chemical change
- none of these
Write short answer.
Name two reversible changes.
True or false
In a physical change no net energy change is involved.
Fill in the blank.
There is no change in the _____________of the substance during a physical change.
Given reason:
Cutting of a cloth piece is a physical change, though it cannot be reversed.
Select the correct answer from the choice given below to complete the sentence
The energy required for completion of a physical change is ______________ when the change is reversed.
Natural changes which take place in nature on their own, are beyond the control of human being.
Give two examples for the following case:
Physical changes which are reversible
Adding sugar to milk is a physical change.
