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Physical Change

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Question

_______ results in formation of a new substance.

A

Physical change

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B

Chemical Change

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C

Both a and b

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D

None of the above

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Solution

The correct option is D Chemical Change
Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms.

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Q. A physical change is always characterised by the formation of a new substance.

Q. Assertion: Tearing of paper is a physical change, although it cannot be reversed.
Reason: Chemical change is a reaction involving the change in chemical properties or composition, resulting in the formation of a new substance.

Q. State whether true or false :
A chemical change refers to a change which is permanent in nature and results into the formation of new substance which is different from the original substance.

Statement 1: When baking soda is added in lemon juice, then a chemical change occurs.

Statement 2: A change in which new substance is formed, is known as a physical change.

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 :

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