What is meant by a substance?

Answer:

A substance is a matter that has definite properties and composition. Every pure compound and element is a substance.

Water, H₂O, is a pure substance, a compound made of hydrogen and oxygen. Every pure substance is homogeneous. Pure substances can be divided into two categories – elements and compounds.

• Elements are made up of the same types of atoms. Example gold and silver
• Compounds are made up of different types of atoms joined together by chemical bonds. An example is carbon dioxide.

Properties of Substance

• A substance is a pure single form of matter.
• It cannot be separated into other kinds of matter by any physical process.
• The substance must be composed of atoms and molecules.
• The substance must have a particular amount of weight, mass and volume.

Few examples of substance are

1. Sugar
2. Sodium chloride.
3. Iron.

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