A pure substance contains only one element or compound and has definite chemical and physical properties, while a mixture contains two or more substances and its properties may vary depending on concentrations. An element cannot be broken down chemically, elements are the basic building blocks of matter, and compounds are made of two or more chemically combined elements. Mixtures can be either homogeneous solutions that are uniform in composition, or heterogeneous mixtures where substances can later be separated as the mixture is not uniform.

1. Pure Substance vs
Mixture

2. What is What?
Pure Substance- is matter that contains only
one element or compound and has definite
chemical and physical properties.
Mixture- is matter that contains two or more substances.
The physical and chemical properties of a mixture may vary
depending on the relative concentrations of the substances
contained within it.

3. What is What?
Elements- is a material which cannot be broken down or
changed into another substance using chemical means.
Elements may be thought of as the basic chemical building
blocks of matter.
Compounds- Compounds are substances made up of two or more
materials (elements) that are chemically combined.

4. What is What?
Mixtures
Homogeneous substances (solutions) are completely uniform in their
composition. A solution is defined as a homogeneous mixture of molecules of
two or more substances.
In a heterogeneous or mechanical mixture, the substances are physically
mixed but they can later be separated. The mixture is not uniform in its
composition.