KEY EQUATIONS
Relative Atomic Mass (Ar) - top no. of the element e.g. Lithium Ar = 7
Relative Formula Mass (Mr) - total no. of atomic masses in a compound e.g. CO2 = 12+(2x16=32) Mr = 44
Percentage mass - Ar/Mr x 100
Moles - mass/mr
Percentage yield - actual/predicted x 100
Mass in reactions - balance equation, work out Mr, divide to get 1, multiply to get what you want
Empirical formula - list all elements, write down experiment masses, divide by Ar, nice ratio
CHROMATOGRAPHY
Paper - the higher the chemical moves up paper, the more its dissolved by solvent
Machines - Advantages = fast, accurate, sensitive
Gas - separates gases in column, measures retention time and how many gases
Mass spectrometry - measuring relative molecular mass
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