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Physical and Chemical Changes

Matter underg...

Question

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 :

A

Chemical only

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B

Physical only

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C

Both chemical and physical

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D

Neither chemical nor physical

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Solution

The correct option is C Both chemical and physical
In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. Because chemical change involves a change in the chemical composition of matter, and a new substance is formed.

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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 of applying pressure or both brings about a physical change. On reversing the condition, i.e., 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, the chemical and physical properties of the substance is formed. In a chemical change, the chemical and physical properties of the substance formed will be different from the original substance. When zinc carbonate is heated and cooled, the change(s) that are observed are :

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. Changes, in which new substances with different properties are formed, are called

(a) physical changes
(b) chemical changes
(c) irreversible changes
(d) reversible changes

Q. During the change of state of matter, both physical and chemical properties of matter changes.

Q. The following are the observations of changes that have taken place. Align them to either chemical change or a physical change.

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