GCSE Chemistry Revision Notes (all the hard stuff)

Chemistry Electrolysis -Anode - + - non- surface (anions) -Cathode - - - solelyoy (cations) -In an aqueous root with a thermolabile coat (Al or G1, G2 section) henry is given at the cathode kind of of the metal --> in companionship to extract the metal reply mustiness be molten, non dissolved -Less reactive metals move be extracted with speed of light -In an aqueous solution with a complex non-metal ion (eg SO4, NO3), O2 is given at the anode 4OH- + 4e- -->2H2O + 2O2 -Active electrodes (made of metal) - the anodes departure is the cathodes gain table sodium chlorides equations Note: An alkali is a unintellectual that will dissolve in water All metal oxides are bases. some(a) are alkalines. A Salt is all metal compound that can be made from acids Usually defecates the take a hop metal+halogen H+ (aq) Ions make a solution acidic. Acid + Base --> Salt + water HCl + KOH --> KCl + H2O Acid + carbonate --> Salt + water + Carbon dioxide 2HCl + MgCO3 --> MgCl2 + H2O + CO2 Acid + metallic element --> Salt + Hydrogen HCl + Li --> LiCl + H Precipitation Salt Solubility -Cl alcohol-soluble (except with Pb, Ag) -SO4 Soluble (except with Ba, Ca, Pb) -NO3 Soluble Li-, Na-, K- -All soluble A precipitation repartee takes the form AB (aq) + CD (aq) --> AD (s) + CB (aq) Ions C and B do not vary state. These are the spectator ions.

Testing salinitys Type of salt (ion)         Test         Precipitate colour Cl         AgNO3          etiolated (AgCl) Br         AgNO3         Cream (AgBr) I         AgNO3         Pale yellow(prenominal) (AgI) SO4         BaNO3         White (BaSO4) Flame Tests Li - Red Na - Yellow K - Purple Ca - Brown Ba - Green Cu - Turquoise R Y PB          T G RYP BG T Other test for Cl: Bleaches... If you want to get a full essay, order it on our website: Orderessay

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