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Answer:
Q- 7 -->chemical change is the permanent change . Because it is irreversible . And physical changes is the property that changes according to temperature , pressure and force .
Q8 - changes where chemical properties follows not physical changes .
Q8 - Rusting only took place when it find a favourable conditions like , moisture in air ( presence of H2O molecules) .
Answer:
ANSWER:1 Chemical change is the permanent change.
2 Chemical change is a process in which the change will remain permanent like burning of paper, boiling of egg , etc.
3 The reaction between moisture and air is required for the rusting of iron.
Explanation:
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