Question

Corrent and rewrite the following statements :
wooden part of the bullock cart wheel is heated to fit in the iron part.
2
Cooking is a reversible change.
3. On heating solids contract
Conversion of cow dung to bio-gas is a physical change.​

Answer 1

Answer:

Correct answers:

1. Iron Part of the bullock cart wheel is heated to fit in the wooden part.
2. Cooking is an irreversible change.
3. On heating solids expand.
4. Conversion of cow dung to bio-gas is a chemical change.

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Answer 2

The correct statements and explanations are as follows:

Incorrect statement: 1. wooden part of the bullock cart wheel is heated to fit in the iron part.

Correct statement: 1. Iron part of the bullock cart wheel is heated to fit in the wooden part.

Explanation:

• A bullock cart has iron tires on its wooden wheels.
• The tyre is constructed with a slightly smaller diameter than the wheel to guarantee a tight fit.
• The tyre initially becomes heated, causing it to expand.
• The wheel is then fitted with the heated tire.

Incorrect statement: 2. Cooking is a reversible change.

Correct statement: 2. Cooking is an irreversible change.

Explanation:

• Other alterations are irreversible:
• There is no way to return to the beginning.
• We refer to these as irreversible alterations. Cooking is a permanent alteration.
• A fried egg cannot be changed back into a raw egg.

Incorrect statement: 3. On heating solids contract.

Correct statement: 3. On heating solids expand.

Explanation:

• The kinetic energy of the atoms in solids increases with heating.
• Because of this, solid atoms vibrate more apart, which causes them to grow larger.

Incorrect statement: 4. Conversion of cow dung to bio-gas is physical change.

Correct statement: 4. Conversion of cow dung to bio-gas is chemical change.

Explanation:

• Biogas production involves a chemical transformation.
• Because many gases from cow dung and other animal waste are released in biogas plants.
• Biogas is created when these gases interact chemically.

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