Question

How are the following changes difference from each other?
i)Changing of milk into curd
ii)Hot milk becoming cold milk

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Answer 1

Answer:

first -chemical change

second-physical change

Explanation:

in first reaction change of composition

in second reaction do not change composition

Answer 2

Changing of milk into curd

answer:

           Milk is converted into curd or yogurt by the process of fermentation. Milk consists of globular proteins called casein. The curd forms because of the chemical reaction between the lactic acid bacteria and casein. During fermentation, the bacteria use enzymes to produce energy (ATP) from lactose.

Hot milk becoming cold milk

answer:

                Hot milk becoming cold is due to the change in temperature. No change takes place in the chemical state.

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