Question

State True (T) or False (F) against the following sentences :
1. Every change can be classified as either physical or chemical.
2. Tearing of paper is irreversible. It is, therefore a chemical change.
3. Some changes can occur even when the interacted substances are not in contact.
4. Metals expand on heating,
5. Burning of candle wax is a reversible change.
6. Cooking is an irreversible change.
7. Solids contract the least while gases contract the most.​

Answer 1

Answer:

1 true

2 false

3 false

4 true

5 true

6 true

7 false

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4

Answer 2

Answer:

1.True

Reason : Sometimes a change in a substance may result in the formation of new substance and sometimes may not. Depending on this, every change can be classified as either physical or chemical.

2.False

Reason : Tearing of paper is irreversible but not a chemical change as we cannot get the original paper back in its original for and a new substance is not formed.

3.True

Reason : Sometimes a change in a substance may result in the formation of new substance and sometimes may not.

4.True

Reason : Metal expands when heated. Length, surface area and volume will increase with temperature. The scientific term for this is thermal expansion.

5.False

Reason : Burning of a candle is an irreversible change that proceeds only in one direction. It is because original candle cannot be recovered from the burnt candle.

6.True

Reason : when we heat raw food materials, we get cooked food. The cooked food cannot be converted back into raw food. So, the cooking of food is an irreversible change.

7.True

Reason : All states of matter expand when heated and contract when cooled. Gases expand most when heated and solids the least because gas particles are already far apart and are much freer to move.

Explanation:

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