GCSE: OCR gateway: C3: Reacting masses

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  • C2
    • Rate of reaction
      • Explosions and Surface Area
        • Combustable powders cause explosions
          • Some powders react with oxygen to make large volumes of CO2 and water vapour
          • Owners of factories using combustable powders (flower) ensure powders cannot reach the atmosphere and that a spark being produced near the powders is small
          • As the surface area of a reactant is increased so is it's rate of reaction; more collisions per second
      • Catalysts and Rates of Reaction
        • Changes the rate of reaction and is unchanged at the end of the reaction
        • Only a small quantity of catalyst is needed to catalyse a large amount of reactants
          • Each catalyst is specific to a paticular reaction
    • Reacting masses
      • Relative Formula Mass
        • Work out the masses inside of the braket
          • Multiply the total by the number outside of the brackets
            • Work out the remaining number
              • Add the totals
                • 164
                  • 40 + 124
                    • Ca(62*2)
                      • Ca(14+(16*3))2
                        • Ca(NO3)2 Ca=40 N=14 O=16
              • 40 + 124
                • Ca(62*2)
                  • Ca(14+(16*3))2
                    • Ca(NO3)2 Ca=40 N=14 O=16
      • Conservation of Mass
        • Mass of reactants equal to products
      • Predicting the Yield of a Reaction
        • Write balanced symbol equation
          • Find atomic masses of the elements
            • Add units
              • Find amount needed to make 1g of product
                • Multiply up to the amount of reactant needed
                  • (80g*20g)/124g = 12.9g
                    • 80g/124g CuCO3 makes 1g of CuO
                      • 124g of CuCO3 makes 80g of CuO
                        • Add units
                          • Find amount needed to make 1g of product
                            • Multiply up to the amount of reactant needed
                              • (80g*20g)/124g = 12.9g
                                • 80g/124g CuCO3 makes 1g of CuO
                                  • 124g of CuCO3 makes 80g of CuO

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