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Why milk sours is chemical change ?

Sagot :

wsp23456

Answer:

Explanation:

So 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.
It is a chemical change as the lactose in the milk of is converted to lactic acid by microbes giving a sour taste
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