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प्रश्न
Classify the following as a physical or a chemical change.
Burning of paper
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उत्तर
Chemical change
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संबंधित प्रश्न
Classify the following as chemical or physical change:
Melting of butter in a pan
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
Write short answer.
Give two examples of periodic changes
Write true or false
Cutting of paper into pieces is a chemical change.
True or false
Is melting of ice a reversible change?
Ice kept in a beaker, slowly melts and turns into water. The water in the beaker on solidification is freezing turns back to ice. Give four reasons why the change from ice to water and water back to ice is considered a physical change.
Match the examples of changes in List I with the correct.
| List I | List II |
| 1. Expansion of a steel rod on heating | A: Physical change |
| 2. Rotting of eggs | B: Chemical change |
| 3. Milk turning sour | |
| 4. Tarnishing of copper | |
| 5. Separation of naphthalene from a mixture of naphthalene and sodium chloride. |
Name the following:
The final product of the physical change involved during the ‘melting of a piece of wax’.
When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.
Analogy:
Melting of ice: Physical change.
Popping of popcorn: ______.
