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प्रश्न
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
उत्तर
| Physical change | Chemical change |
| Changes are temporary and reversible. | Change is permanent and irreversible |
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संबंधित प्रश्न
Fill in the blank
change in which the substance can be brought back to its original state is called a ............... change.
Distinguish between the following.
Physical change and chemical change
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Differentiate between the following change with a suitable example.
Natural and man-made change.
Give three reasons why melting of wax, is considered a physical change while burning of a candle, a chemical change.
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Give a reason why – Addition of zinc nitrate to water is a physical change but, the addition of zinc to dilute nitric acid is a chemical change.
Distinguish physical and chemical changes.
Classify the following as physical or chemical properties
The composition of a sample of steel is 98% iron, 1.5% carbon and 0.5% other elements.
Give two examples for each of the following cases:
Physical changes which are not reversible.
Give an example of a physical change in which the color of the substance changes.
