Chemistry
State the observations seen, when milk in a dish is kept aside for a few hours or more. Is the change which occurs - a physical change or a chemical change. Give reasons.
Phy & Chem Changes
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Answer
When milk in a dish is kept aside for a few hours or more, it forms curd. On keeping aside longer, the curd does not change back to milk, hence it is an irreversible change.
New substances are formed. The original substance is milk, and the final product is curd. As the change is irreversible and new substance is formed, hence, it can be concluded that it is a chemical change.
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