Question

when two substance 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:

Example for physical change=salt in water

Example for chemical change=curd in milk

Explanation:

the ice is put in contact with the hot iron ball, then the ice melts so, there is the physical change. the curd and milk are put in together to form more curd so, it is the chemical change.