Question 12

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.

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Solution

Melting of ice is also a change where solid changes into liquid state. Ice cream when not eaten quickly melts into a liquid.

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Melting of wax is a change where solid changes to a liquid state and this type of changes are called chemical changes.

Q. Assertion :The burning of a candle is both a physical and a chemical change. Reason: Burning of candle melts the wax and hence physical state of wax has changed from solid to liquid. Again the wax combines with the atmosphere oxygen and changes to carbon dioxide, heat and light.

We observe that some portion of wax (in a candle) melts and another portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change.
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

Amount of heat required to change a substance from its solid state to its liquid state at melting point is known as?

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Physical Change

Standard VII Chemistry

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Question 12 Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.

Melting of ice is also a change where solid changes into liquid state. Ice cream when not eaten quickly melts into a liquid.

Question 12

Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings.