A solution is a type of the homogeneous mixture which is composed of two or more substances. The specie which is dissolved into the another substance is known as solute and in which it is dissolved is known as a solvent.
A compound is the substance which is formed when two or more elements are bonded together chemically. Thus, Water is a compound.
Soda, salt water, orange juice and coffee are homogeneous mixtures. Soda consists of gas which is dissolved in it. Orange juice is also a solution as it contain pulp or other biomolecules dissolved in it. Coffee is made up of milk which have solutes dissolved in it. Salt water is also a solution.
Octet rule is a chemical rule that shows elements in main group bond so that each atom have 8 valence electrons in the outmost shell which make them to have similar electronic configuration with Noble gases This is important because the sharing of electrons make atoms to have full shell. Atoms with electrons not up to 8 react with more stable compound.
