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Reversible and Irreversible Change

New substance...

Question

New substances are formed by
(a) physical change
(b) chemical change
(c) both of these
(d) none of these

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Solution

(b) chemical change
New substances are formed by chemical change.

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Similar questions

Q. Statement 1: No New substance is formed during a physical change.

Statement 2: New substances are formed during chemical changes.

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

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 :

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Reversible and Irreversible Change

Standard VII Chemistry

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