4. Mention two chemical changes.
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Digestion of food
Formation of curd
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Examples of chemical changes are burning, cooking, rusting, and rotting.
Examples of physical changes are boiling, melting, freezing, and shredding.
Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical reaction.
Examples of Chemical Changes
A new compound (product) results from a chemical change as the atoms rearrange themselves to form new chemical bonds.
Burning wood
Souring milk
Mixing acid and base
Digesting food
Cooking an egg
Heating sugar to form caramel
Baking a cake
Rusting of iron
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