GCSE science chemistry unit C5
- Created by: charlie
- Created on: 02-05-13 21:38
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- C5
- the mole
- 6.023x10^23
- one mole=R.A.M
- no. of moles= mass(g)/relative formula mass(Ar or Mr)
- R.A.M compared to carbon-12
- compared to 1/12 of the atom
- equilibrium
- reached when P=R at same rate
- shift to right- Pincrease Rdecreases
- shift to left- Pdecreases Rincreases
- change by
- not catalyst
- temp
- if exo. E will try and make end. VICE VERSA
- pressure
- if inc. E will try and dec. move to less moles VICE VERSA
- concen.
- inc. R then E moves right VICE VERSA
- reactants
- limiting reactant
- when used up
- excess reactant
- limiting reactant
- acids
- strong
- HCL
- H+ disassociate fully at once
- ionise completely in water
- better conductor
- higher concen. in acid- more charge
- HCL
- weak
- CH3COOH
- only few H+ released
- E on left
- same concen. slower rate of reaction
- low collision frequency
- H+ concen. dec. E shifts to allow H+ released
- drip feed
- only few H+ released
- CH3COOH
- both react with..
- Mg gives H2
- CaCO3 gives CO2
- amount of products the same
- concen. the same- no. of molecules the same
- strong
- pH of solution
- how many H+ in it
- contact process
- makes sulphuric acid
- compromised temp (450)
- pressure
- 2 moles R 3 moles P
- E already on right
- no need to increase
- 2 moles R 3 moles P
- catalyst
- V2O5
- Haber process
- high pressure
- low temp. (200)
- empirical formula
- rations
- C2H6=CH3
- gas vol.
- gas syringe
- stiff
- accurate to one cm^3
- upturned cyclinder/ burette
- nearest o.1 cm^3
- H2, CL2 and NH3 dissolve in water
- mass of gas produced
- release gas into room
- most accurate
- gas syringe
- titration's
- amount acid to neutralise alkali
- changes colour
- universal indicator
- range
- litmus
- red-purple
- phenolphthalein
- clear-pink
- universal indicator
- changes colour
- amount acid to neutralise alkali
- precipitation reactions
- solution+solution=insoluble substance (precipitate)
- test for sulphate ions
- add dilute HCl+BaCl2
- white precip. of barium sulphate
- original was sulphate
- white precip. of barium sulphate
- add dilute HCl+BaCl2
- test for halide ions
- add dilute HNO3+lead nitrate
- chloride ions
- white precip.
- bromide ions
- cream precip.
- iodide ions
- yellow precip.
- chloride ions
- add dilute HNO3+lead nitrate
- ions in molten/solution
- free to move and form precip.
- high collision freq- quick reaction
- free to move and form precip.
- preparing insoluble salts
- wanted ions in solution
- mix solutions- leaving precip.
- filer through funnel
- rinse with distilled water washing away soluble salts
- scrape salt and dry
- rinse with distilled water washing away soluble salts
- filer through funnel
- mix solutions- leaving precip.
- wanted ions in solution
- the mole
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