GCSE Chemistry Revision Notes (all the hard stuff)

Chemistry Electrolysis -Anode - + - non-metal (anions) -Cathode - - - metal (cations) -In an aqueous solution with a reactive metal (Al or G1, G2 element) hydrogen is given at the cathode instead of the metal --> in order to extract the metal solution must be molten, not dissolved -Less reactive metals can be extracted with Carbon -In an aqueous solution with a complex non-metal ion (eg SO4, NO3), O2 is given at …showed first 75 words of 458 total…

…showed last 75 words of 458 total…energy than the products (energy is given out as heat during the reaction). Opposite is true for an endothermic reaction. - Breaking bonds requires energy. It is endothermic. - Making bonds gives out energy. It is exothermic. Activation energy is the energy needed for a reaction to start. It is lowered with a catalyst. Fermentation (Anaerobic respiration) Glucose --> Ethanol (alcohol) + carbon dioxide C6H12O6 --> 2 C2H5OH + 2 CO2