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प्रश्न
Fill in the blank.
When a candle burns, wax melts. Melting of wax is a ________ change.
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उत्तर
When a candle burns, wax melts. Melting of wax is a physical change.
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संबंधित प्रश्न
Tick the most appropriate answer.
4. Chemical changes involve
- change in shape.
- change in size.
- change in molecular composition.
- none of these
A physical change is temporary. Explain.
State four differences between physical and chemical changes.
State whether the following is physical or chemical changes.
heating a mixture of iron filings and sulphur—
True or false
Is melting of ice a reversible change?
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
The rusting of an iron object is called :
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.
A change in which matter undergoes a change but the total mass of the substance is unaltered is a ______ change.
Water is the universal solvent. Why?
