Question

i)Souring of milk is a physical or chemical change?
ii)Dissolving salt in water is a physical or chemical change?

Answer 1

Explanation:

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Answer 2

Answer:

(1.) chemical changes require a change on a molecular level that cannot be reversed because they form some new substance. Souring milk is not something you can reverse, and the process of it souring produces new molecules.

(2.) salt dissolving in water is usually considered to be a physical change, however the chemical species in salt solution (hydrated sodium and chlorine ions) are different from the species in solid salt.

Explanation:

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