Relative Atomic Mass - the mass of an atom compared with that of the carbon-12 isotope which has a mass of exactly 12, and is a weighted mean of the mass numbers., Percentage Yield - Actual Yield/ theoretical yield x 100, Moles - Mass/ Mr, Mass - Moles x Mr, Reasons we don't get 100% yield - side reactions/ reaction isn't complete/ loss by mechanical transfer/ reversible reactions/ during separating techniques, Empirical Formula - Simplest whole number ratio of atoms of each element in a compound, Molecular Formula - actual number of atoms of each element in a molecule, Water of Crystallisation - Water that is chemically bonded to the crystal structure, Hydrated - solid crystals contain water of crystallisation, Dehydrated - Means the removal of water of crystallisation, Anhydrous - Does not contain water of crystallisation, Degree of hydration - the number of moles of water of crystallisation chemically bonded in 1 mole of a compound. CuSO4.5H2O, Desiccant - drying agent, Why is it important to keep lid on? - No loss of solid, Why is it important to lift the lid now and again? - Allow some air in,

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