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Physical and Chemical Changes

Which of the ...

Question

Which of the following are the properties of a chemical change?

A

Generally irreversible

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B

Chemical composition of the substance changes

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C

New substance is formed

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D

All of these

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Solution

The correct option is D
All of these

Chemical change is defined as any change that results in the formation of new chemical substances. It involves making or breaking of bonds between atoms, which results in changing the chemical composition of a substance. They are generally irreversible. For example, rusting of iron (iron oxide forms) and gasoline burning (water vapour and carbon dioxide is formed).

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Q. The physical property of a substance can be measured without changing its chemical composition. Which of the following are physical properties?

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. Sate which of the following pertains to- chemical changes.
a] substance retains its identity
b] The change is permanent
c] No new substance is formed.
d] is easily reversible
e] Produces one or more new substance in its composition.
f] The change is temporary
g] The composition and properties of the original substance are not altered.

Q. Which of these is a chemical change?

(a) A substacne with different chemical properties is formed.
(b) A substance in a different state but similar chemical properties is formed.
(c) The molecules of the substances do not undergo any change.
(d) A substance with a different shape and size but similar chemical properties is formed.

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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