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Question
Classify the following as a physical or a chemical change.
Butter getting rancid
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Solution
Chemical change
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An earthquake is a .................. change.
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Dissolving of a solid in liquid is a physical change.
Solve this crossword by using the clues that follow-
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1. Energy in the form of sunlight is absorbed by the green plants in this process.
4. The reddish-brown substance formed over iron in the presence of oxygen and moisture.
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2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change.
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The process of a liquid changing into a solid is called ________
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| 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. |
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A physical change is generally____________.
