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Pure Substance
If a substance is made up of only one type of
constituent particles (fixed composition of constituents).
Element
It is basic form of matter which cannot be broken down into simpler substances by chemical reactions.
Compound
A substance made of elements chemically combined with one another in a fixed proportion.
Mixtures
When more than one kind of pure substances are mixed together to form a substance it is called ________.
Homogeneous
It's a mixture in which the constituents are uniformly distributed throughout without any clear boundary of separation between them.
Heterogeneous
It's a mixture that does not have uniform composition, i.e. it has visible boundaries of separation.
Solution
It's a homogeneous mixture of two or more
substances.
Solvent
The component of solution that dissolves the other
component (present in large amount).
Solute
The component of the solution that is dissolved in the solvent (present is lesser quantity).
Alloys
Mixture of 2 or more metals or a metal and a nonmetal, they can't be separated by simple physical means.
Suspensions
Its a heterogeneous mixture in which the solute
particles do not dissolve, but remain suspended in the medium.
Colloidal solution
Its a mixture which is actually heterogeneous but looks like homogeneous as particles are uniformly spread throughout the solution.
Tyndall Effect
The scattering of light by colloidal particles.
Note 
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