Chap 3 Booklet
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difference between relative molecular mass, relative formula mass and relative atomic mass
molecular .covalent compounds .sum of relative atomic masses of all atoms of all atoms in a molecule .e.g H2O = 18 formula .Ionic compounds .sum of the relative atomic masses of all the ions in a formula unit of the compound .e.g NaCl = 58.5 Atomic mass .applies to individual atoms .Cl = 35.5
Explain anhydrous, hydrated, water of crystallization
Anhydrous .substance contains no water Hydrated .contains water molecules within its crystal structure Water of Crystallization .water molecules that are part of the crystal structure of a hydrated compound
techniques
Measuring mass .calibrate the balance and other very obvious stuff Measuring volumes .read the meniscus