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Question
Match the examples of changes in List I with the correct type of change in List II.
| List I | List II |
| 1. Burning of paper | A: Physical change |
| 2. The ringing of an electric bell | B: Chemical change |
| 3. Curdling of milk | |
| 4. Electric light is switched on | |
| 5. Melting of butter |
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Solution
| List I | List II |
| 1. Burning of paper | B: Chemical change |
| 2. The ringing of an electric bell | A: Physical change |
| 3. Curdling of milk | B: Chemical change |
| 4. Electric light is switched on | A: Physical change |
| 5. Melting of butter | A: Physical change |
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RELATED QUESTIONS
Classify the following as chemical or physical change:
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Solve this crossword by using the clues that follow.
Across
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.
5. This change is permanent and irreversible.
6. The process in which a solid directly changes into gaseous state.
Down
1. It is the change that takes place in case of swinging pendulum of a clock.
2. Occurrence of this is a non-periodic change as well as a natural change.
3. It is a physical change
Fill in the blank
Changes that occur in nature are called ______
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Fill in the blank.
The reaction in which energy is evolved is called
Give a reason why
Freezing of water is a reversible change while burning of a candle – an irreversible change.
Assertion: Burning of wood log to charcoal is a physical change.
Reason: The products formed of burning a piece of wood can be easily converted back to wood log.
Gas exists in three states as solid, liquid, and gas.
Water is the universal solvent. Why?
