For example the air is a homogeneous mixture made of mainly nitrogen gas (about 78%) and oxygen (about 21%) and some other gases in small amounts (about 1%). Air is considered a solution which is based on homogeneous mixture of nitrogen and oxygen mainly.

Also brass is considered as an alloy (homogenous mixture) made of copper (in access amount) and zinc (in limited amount). Steel also considered as another alloy made of iron (in access amount) and carbon (in limited amount).

Oceans are made of hard water which contains higher content of Magnesium and Calcium ions. Oceans are considered homogeneous mixtures and hence solutions.

In this chapter we will learn more about solutions: types, concentrations, solubility and properties.

The table below summarizes the different solute and solvent types with examples

Solute	Solvent	Type of solution	Example
liquid	liquid	liquid	alcohol – water
solid	liquid	liquid	salt – water
gas	liquid	liquid	oxygen – water
gas	gas	gas	air = oxygen – nitrogen
gas	solid	solid	hydrogen – Palladium
liquid	gas	gas	water in air
solid	gas	gas	smog
liquid	solid	solid	Alloy -Mercury Zinc
solid	solid	solid	Alloy- Copper and Zinc

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