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Essential ICSE Chemistry for Class 7
4. Giving one example of each kind, show that a change in energy takes place when a physic
chemical change occurs.
5. What is respiration? Explain.
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In my school there is not chemistry in 7th
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4. Physical Change - When solid dry ice vaporizes, carbon dioxide molecules absorb energy. Meanwhile, when liquid water vaporizes it releases energy. Chemical change - When a paper is burnt it releases energy in the form of heat and light.
5. Respiration is the movement of oxygen from the outside environment to the cells within tissus, and the transport of carbon dioxide in the opposite direction.
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