Making of curd from milk is a physical change.How?

Making of curd from milk is a chemical change.The bacteria Lactobacillus when added to milk converts it into curd.The bacteria breakdown the lactose in milk to lactic acid.This increases the acidity of milk due to which the milk protein casein coagulates as curd.This process is known as fermentation and requires a temperature of 35 - 40 degree Celcius.

The chemical reaction involved is:

C12H22O11 (lactose) + H2O (water) → 4 CH3CHOHCOOH (lactic acid)

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making curd from milk is chemical change because after making the milk curd we cannot make it milk again

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Making of Curd is not a physical change, it is a chemical change. Since in physical change no new item is formed only the shape or size changes. But in a chemical change a new item is formed. When milk is changes to curd, we cannot change it back to milk, so a new item has formed.

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Yes, Aditya Nandy is absolutely right.

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making of curd from milk is a chemical change making of curd is not a physical change

because we cannot make curd milk again

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making curd from milk is chemical change because after making the milk curd we cannot make it milk again

Making of Curd is not a physical change, it is a chemical change. Since in physical change no new item is formed only the shape or size changes. But in a chemical change a new item is formed. When milk is changes to curd, we cannot change it back to milk, so a new item has formed.

making of curd from milk is a chemical change making of curd is not a physical change

 

because we cannot make curd milk again

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