Purity and mixtures

Pure substance

Either a single element or a single compound

Mixture

A combination of two or more substances that are not chemically combined

Formulation

A mixture that has been designed for a specific purpose

Melting/boiling point of pure substances

a single defined temperature

Melting/boiling points of mixtures

a range of temperatures

Melting point of pure water

0 °C

Boiling point of pure water

100 °C

Examples of formulations

Paint, processed food, fuels, cleaning products, cosmetics

Test for purity

Test melting/boiling point

Nanoparticles

lumps of substance that are 1

Nanoparticles in formulations

Useful in formulations as you can use less

Test if water is pure

test if boiling point is exactly 100 °C