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Irreversible Change

A substance u...

Question

A substance undergoes a change in which its molecules undergo changes. What kind of change is it - physical or chemical?

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Solution

When a substance undergoes a change in which its molecules undergoes changes it shows that it is a chemical change.

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Q. In which of these do the molecules of substances undergo changes–physical change or chemical change?

State one instance where water undergoes a physical change and one in which it undergoes a chemical change.

Q. A change in which a substance undergoes changes in its physical properties is called:

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 :

Q. Give instances for water undergoing a physical change and a chemical change.

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Irreversible Change

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