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Chemical Reactions

Which of the ...

Question

Which of the following statements is correct about a chemical change?

A

The change is temporary and reversible

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B

No new products are formed

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C

The chemical change is always accompanied with the liberation or absorption of energy

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D

There is no change in weight of substance

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Solution

The correct option is C
The chemical change is always accompanied with the liberation or absorption of energy

The chemical change is always accompanied with the liberation or absorption of energy. Others are characteristics of a physical change.

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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. A chemical change is always accompanied by the formation of new chemical compound(s).

Q. Which of the following is not a feature of chemical change?

(I) Original substance can be obtained by simple physical methods.
(II) It is a temporary change.
(III) The new substances formed have properties different from those of the reacting substances.

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. Q. With reference to physical and chemical change consider the following statements:Which of the above given statements is/are correct?

1 and 2 only
1 and 3 only
3 only
1,2 and 3

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