Purity and Formulations + Chromatography

What is a pure substance?

something that contains one compound or element

What is meant by melting point?

temperature at which a solid turns into a liquid

What is a boiling point?

temperature at which a liquid turns into a gas

What property can be used to distinguish between a pure substance and a mixture?

melting and boiling points

How can melting points and boiling points distinguish between pure substances and mixtures?

pure substances have specific and sharp melting points but mixtures can have a range

What is a formulation?

a mixture designed as a useful product

What are examples of formulations?

• fuels

• cleaning agents

• paints

• medicines

• alloys

• fertillisers

• food

How is a formulation made?

by mixing components in carefully measured quantities to ensure it have the required properties

What is Paper Chromatography used for?

to separate substances that have different solubilities in a given solvent

What does a single spot on a chromatogram indicate?

That the substance is pure