Question

2. When two substances are brought in contact, there may be a physical or a chemical change, depending on
the conditions. Give two examples to prove this statement.
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Answer 1

Answer:

For example,Fire is in contact with Paper,It's a chemical change here but if Paper is contacted with water,It's a physical change,Here,Because the Paper can be dried again,But chemical change is irreversible because burned paper can't get in its original form.

Answer 2

Answer:

Fire is in contact with Paper,It's a chemical change here but if Paper is contacted with water,It's a physical change,Here,Because the Paper can be dried again,But chemical change is irreversible because burned paper can't get in its original form....

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