C5
- Created by: 11APhillips
- Created on: 30-11-15 18:47
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- C5
- Moles, % composition and empirical formula
- No of moles = Mass/Molar Mass
- % composition = amount in element/amount in compound * 100
- Empirical formulae = Most simple way of writing
- Quantitative analysis
- No of moles = concentration * volume
- 1mol/dm3 - 0.1mol/dm3 = take 100cm3, add 900cm3 of water.
- Food Labels, working out amount of salt
- Titrations
- Acid + alkali = salt + water
- No of moles of acid = no of moles of alkali
- Gas Volumes
- No of moles = vol of gas dm3)/24
- Equilibria
- Balance of reactant and product
- Temperature - Moves equilibrium towards reactantPressure - equilibrium towards the productCatalyst - doesn't affect
- Contact process
- S+o2 = S02/ 2S02+02 = 2S03 / S03 = H20 = H2SO4.
- Strong and weak acids
- Strong acid = HCl
- Total ionisation of atoms HCl ->H++cl-
- Weak acid = CH3COOH
- Part ionisation (reversable)
- Strong acid = HCl
- Ionic equations and precipitation
- 1 - Filter off barium sulphate
- 2. Dry and clean
- Moles, % composition and empirical formula
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