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Slow Changes and Fast Changes

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Question

________________________ changes are usually reversible in nature.

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Solution

A change in which a substance undergoes a change in its physical properties is called a physical change.
A physical change is generally reversible.
Example : Melting, Freezing, Boiling.

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Q. Fill in the blanks to say whether the following changes are 'reversible' or irreversible':
1. A change which cannot be reversed is called ............................... .
2. Setting of cement is an example of a ............................... change.
3. Absorption of water by a sponge is an example of a ............................... change.
4. Cooking of food represents ............................... change.
5. Digestion of food is a ............................... change.

A sheet of paper is used to make a paper boat. This is a ___ change. (reversible/irreversible)

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 :

Question 4

Characteristic 1: properties of a substance change.

Characteristic 2: physical changes are reversible in nature.

Q. is building a wall a reversible change ?

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Slow Changes and Fast Changes

Standard VII Chemistry

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