Substance


 
 
Concept Explanation
 

Substance

Substance :

A substance is matter that has definite properties and composition.The substances existing around us may be pure or impure. A pure substance consists of a single material. All its constituents have similar properties. An impure substance consists of two or more material. Mixture is a type of impure substance.

Matter: Anything that occupies space and has mass is called matter. Everything in this universe is made up of matter. Matter is made up of extremely small particles called atoms. For example, smallest piece of copper, gold or silver or any other element is called atom. An atom cannot be broken down into simpler substances by any physical or chemical methods.

A substance which is made up of two or more elements combined chemically in fixed proportion is called compound. Compound exist as molecules like water, carbon dioxide etc.

Case of water: Water is made up of hydrogen and oxygen. Water consists of atoms of hydrogen and oxygen. The smallest particle of water is one molecule of water. It contains two atoms of hydrogen and one atom of oxygen.

Sample Questions
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Question : 1

Substance is a kind of matter that cannot be separated into other kinds of matter by __________________________ .

Right Option : B
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Question : 2

Which of the following represents a substance

Right Option : A
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Question : 3

Which of the following are correct :

(a) Anything that occupies space and has mass is called matter.

(b) Matter is made up of extremely small particles called atoms.

Right Option : C
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