Question

It has a definite composition and unique set of properties

Answer 1

Answer:According to this definition a chemical substance can either be a pure chemical element or a pure chemical compound. But, there are exceptions to this definition; a pure substance can also be defined as a form of matter that has both definite composition and distinct properties.

Explanation:

Answer 2

Pure substance has a definite composition and unique set of properties.

Explanation:

• Pure substances and mixtures are the classification of matter.
• Only one kind of particle is present in a pure substance.
• The example for pure substance is gold.
• If two or more kinds of particles are combined together in a definite proportion by weight, then it is also called as pure substances.
• For example, sodium chloride has fixed number of particles and fixed proportion, hence it is a pure substance.
• The homogeneous materials are called pure substances.