GCSE: OCR gateway: C3: Rate of reaction

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  • C2: Rate of reaction
    • Reaction rates
      • How much of the product has been formed over a fixed period of time
      • Reaction fast at start and then slows down as the reactants are used up
      • Ways  of measuring rates of reaction
        • g/s + g/min: when measuring the mass of a product formed
          • g/s for fast reactions
          • g/min for slow reactions
        • cm3/s + cm3/min when measure the volume of gas produced
          • cm3/s for fast reactions
          • cm3/min for slower reactions
    • Calculating the rate of reaction
      • Worked out with graph gradient
        • Choose part of the graph where there's a straight line
          • Measure the value of y and x
            • Divid y by x
              • Add units
    • Limiting reactants
      • Reactant not in excess and used up at end of reaction
      • Directly proportional to amount of product formed
      • Reactions occur when particals collide together
        • If no of reacting particals of one reactant is limited the no of collisions of particals by that reactant are limited
    • Rate of reaction
      • Reaction has finished
        • Graph: horizontal line
        • Table: numbers stop changing
      • Faster reaction
        • Graph: steepest line
        • Table: larger change in readings
    • Reacting partical model
      • Chemical reactions occur when particals collide
      • Rate of reaction = collisions per second with reacting particals
      • Rate of reaction increase
        • Temperature: Particals gain more kinetic energy and move around more quickly so there are more collisions per second
        • Pressure: particals closer together so more collisions per second
        • Concentration: particals more crowded so more collisions of reacting particals
      • For a successful collision each particals must have enough energy to react

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