Question

5.
Give an example of a physical change that cannot be reversed.
What kind of change is observed when copper
utensils appear to be

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Answer 1

Answer:

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Explanation:

Many physical changes can be reversed, like water freezing to form ice. But some physical changes cannot, such as an egg being cracked or wood being ground into sawdust. Chemical properties are characteristics of a substance that can only be observed during a reaction.

When a copper utensil is exposed to air or comes in contact with the same, a reaction takes place between copper,and gases and moisture present in the air which results in the formation of a mixture of copper compounds which imparts a green colour to the surface of the metal.