Explain why the curdling of milk is a chemical change.

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Solution

Chemical changes
These changes are permanent change and can not be reversed back.
Change in the chemical composition of a substance takes place.
These changes occurs due to chemical reactions.
Conversion of milk to curd
Conversion of milk to curd is a useful chemical change.
This conversion requires a tinch of Lactobacillus bacteria.
This conversion helps to increase the nutrient value of milk as well it becomes suitable to consume for Lactose intolerance peoples to digest it.
why the curdling of milk is a chemical change.
Milk contains casein protein, which reacts with lactic acid.
This Lactic acid causes formation of curd (semi-solid form of milk) .
It involves breaking down of chemical bonds in milk and replacing them with new bonds.
Curdling milk is thus a chemical change.

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What are chemical changes? With the help of an activity, explain that curdling of milk is a chemical change.

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(d) Curdling of milk

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