Toms Chemistry revision 0.0 / 5 ? ChemistryAcids, bases and saltsGCSEEdexcel Created by: tbailey20Created on: 26-03-18 09:59 Moles = mass/Mr 1 of 19 Percentage = (mass of component/total mass) x 100% 2 of 19 Rf= distance moved by a spot/distance moved by solvent 3 of 19 Distance moved by the spot= Rf x distance moved by solvent 4 of 19 Distance moved by solvent = Rf x distance moved by the spot 5 of 19 Atomic number = number of protons in the nucleus of an atom of an element 6 of 19 Mass number = number of protons + number of protons in the nucleus of an atom of an element 7 of 19 Mass of substance (in grams)= amount x Mr 8 of 19 Volume of gas (in dm3) = amount x 24 9 of 19 Volume of gas (in cm3)= amount x 24000 10 of 19 Amount if gas (in moles)= volume of gas (in dm3) / 24 11 of 19 Amount if gas (in moles)= volume of gas (in cm3) / 24000 12 of 19 Amount of dissolved substance (in moles) = (volume of solution (in cm3) x concentration of solution (in mol/dm3) / 1000 13 of 19 Percentage yield = Yield obtained / theoretical yield x 1000 14 of 19 Quantity (in coulombs) = Current (in amperes) x Time (in seconds) 15 of 19 Quantity (in coulombs) = Q=IR 16 of 19 Percentage of oxygen = volume of oxygen used / volume of air at start x 100 17 of 19 Heat given out = mass of solution x specific heat capacity of solution x temperature rise 18 of 19 Rate = change of concentration of reactants / time 19 of 19
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