Rates of reaction

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  • RATES OF REACTION
    • RATE = how FAST a reaction goes (speed)
      • to measure the change over a period of time
    • Graph
      • The curve is steepest at the start so the reaction is fastest then (its rate is greatest
      • The slope keeps changing until the curve flattens out which tells us that the rate of the reaction keeps changing
      • The curve becomes less steep as time passes, showing that the reaction is slowing down
      • The slope of the curve tells you how fast the reaction is going
      • When the curve goes flat, it means that the reaction has stopped. The reaction rate is zero
    • Average rate of reaction (in cm   per min or sec) = total volume of gas collected (in cm  ) divided by total time taken (in min or sec)
    • Ways to change the rate of reaction
      • by changing the particle size
      • using a catalyst
        • for example using manganese oxide
        • Catalysts in industry
          • When making ammonia, iron (a catalyst) is used.
          • Reduces fuel bills
      • by changing the temperature
        • If you increase any of these the rate will increase, and if you decrease them then the rate will decrease
          • by changing the concentration
          • by changing the particle size
      • by changing the concentration

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