Question

which of the following is not a chemical change?

Digestion of food

Melting of wax

Curdling of milk

Rusting of iron

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Answer 1

Answer:

Melting of wax

Explanation:

Melting of wax is a reversible process.

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Answer 2

Answer:

Digestion of food—

Mechanical digestion occurs in the mouth, stomach, and small intestine. Food is chemically changed in digestion when new, smaller substances are formed. These chemical changes are examples of chemical digestion. Chemical digestion begins in the mouth when enzymes in saliva begin to break down carbohydrates.Therefore digestion of food is a chemical change

Melting of wax—

The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes.

curding of milk—

when curd is formed from milk ,milk loss its properties and new thing( curd ) is formed . the change is permanent in nature as milk cannot be formed from curd now that's why curdling of milk is a chemical change.

rusting of iron—

As the rust forms on the surface of the iron, it flakes off to expose more iron, which will continue to rust. Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change. A chemical property describes the ability of a substance to undergo a specific chemical change.

Explanation:

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