Question

WRITE THREE EXAMPLES OF THE FOLLOWING

1. Reversible changes
2. Irreversible changes

Answer 1

Answer:

reversible - melting of ice , boiling water

irreversible- cooking of food,rusting of iron

Answer 2

Answer:

Reversible changes

1. A reversible change is a physical change that can be undone. A final     substance can be converted back to the original substance without creating any new material. Freezing, melting, dissolving, boiling, evaporating and condensing are reversible changes.

Irreversible change

2. Irreversible changes are permanent changes that cannot be undone. Cooking, baking, frying, burning, mixing, rusting, heating are examples of irreversible changes.

Explanation:

Reversible changes

1. Melting: Melting is when solid converts into a liquid after heating. Example of melting is turning of ice into water.

2. Freezing: Freezing is when a liquid converts into a solid. Example of freezing is turning of water into ice.

3. Boiling: Boiling is when a liquid converts into a gas.

Irreversible changes

1. When you burn a piece of paper, first the paper changes colour then it bursts into flame and gives off a lot of heat and smoke. Soon it ends up as black

2. When you heat a raw egg to make a cooked egg, the fried egg cannot be changed back to a raw egg again.

3. You cannot change a baked cake back into its ingredients.

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