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Physical and Chemical Changes

Arvind tried ...

Question

Arvind tried a mischief and placed a hot bottle in cold water. The bottle cracked immediately. Is there any change? If so, is it chemical?

A

Physical change

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B

Chemical change

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C

Both physical and chemical change occured

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D

Cannot be ascertained

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Solution

The correct option is A
Physical change

When Arvind placed the hot bottle in cold water, it underwent sudden shrinkage of the outer layer and that resulted in cracks appearing in the bottle.

This is a physical change as no new substance was created.

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Similar questions

Q. (a) Give the main difference between physical changes and chemical changes.
(b) Which of the following are chemical changes and which physical ? Give reason.
(i) a glass bottle breaking
(ii) coal burning in air
(iii) making a cake
(iv) wool being knitted into a sweater

Q. Assertion :A physical property can be identified without bringing any chemical changes. Reason: Chemical changes takes place through chemical reactions.

An example in which both physical and chemical change occurs?

Q. Matter undergoes a change. The changes are of two types: Physical and chemical change.

A physical change is a change that involves only a change in the physical state of matter. Its chemical properties remain the same. Usually increasing the temperature or applying pressure or both bring about a physical change. On reversing the condition, that is reducing the temperature or reducing the pressure or both, the original state of matter is restored. In other words, physical changes are reversible.

A chemical change is a change that involves a change in the chemical composition of matter. A new substance is formed. In a chemical change, new chemical and physical properties of the substance are formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance.

In a chemical change, the properties that change are :

Give reason:

(a)Freezing of water to ice and evaporation of water are physical changes.

(b)Burning of a candle is both a physical and a chemical change.

(c)Burning of paper is a chemical change.

(d)Cutting of a cloth piece is a physical change, though it cannot be reversed.

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