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Evaporation

A change that...

Question

A change that alters the composition of a substance is known as a chemical change.

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Solution

A chemical change is a permanent, not easily reversible change in which the identity of the substance is altered to produce one or more new substances.

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Fill in the blanks :

(a) The process of a liquid changing into a solid is called_______________

(b) A change which alters the composition of a substance is known as a _______________ change

(c) There is no change in the ____________of the substance during a physical change.

(d) The reaction in which energy is evolved is called_______________

The substance that undergoes chemical change is known as:

Q. Assertion :Physical change of a substance involves change in all properties and composition of its molecules Reason: The change of a substance with alteration of composition of its molecules without any change in its specific property is called physical change

What happens to the chemical composition of the original substance during a chemical change?

Q. Assertion :Catalyst is a substance which takes part in a chemical reaction, undergoes chemical change and alters the rate of a reaction Reason: Catalyst is a substance which does not take part in a chemical reaction, but changes the rate of reaction

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