Chemistry Equations 3.0 / 5 based on 2 ratings ? ChemistryWriting balanced equationsIGCSEEdexcel Created by: Emilia PriceCreated on: 19-05-13 14:52 Atomic Number Number of protons in the nucleus of an atom of an element. 1 of 16 Mass Number number of protons + number of neutrons in the nucleus of an atom of an element. 2 of 16 Relative Atomic Mass total mass of 100 atoms/100 3 of 16 Relative Formula Mass total sum of all the relative atomic masses of all the atoms present in the formula 4 of 16 Mass of one mole relative atomic mass expressed in grams 5 of 16 Calculating mass from amount mass of substance = amount x Mr 6 of 16 Calculating amount from mass amount in moles = mass of substance/Mr 7 of 16 Calculating volume of gas from amount of gas volume of gas (in dm ) = amount x 24 8 of 16 Calculating amount of gas from the volume of gas amount of gas (in moles) = volume of gas x 24 9 of 16 Empirical Formula Amount of atoms = mass/Ar = (no/1) 10 of 16 Calculations involving concentrations of solutions amount of dissolved substance (in mol) = volume of solution x concentration of solution (mol/dm )/1000 11 of 16 Percentage Yield yield obtained/theoretical yield x 100 12 of 16 Electrolysis Calculations quantity (in coulumbs) - current (amperes) x time 13 of 16 Percentage of oxygen air percentage of oxygen = volume of oxygen used/volume of air at start x 100 14 of 16 Measuring heat energy change during reactions of solutions heat given out = mass of solution x specific heat capacity of solution x temperature rise 15 of 16 Rate of reaction rate = change of concentration of reactant/time 16 of 16
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