Rates summary

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  • Created by: h98
  • Created on: 24-11-15 18:02
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  • RATES
    • change in concentration per unit time   (mol1dm-3)
    • factors affecting rate
      • surface area: larger surface area, more frequent and more successful collisions.
      • catalyst: speeds up rate of reaction without being used up, lowers Ea by providing and altering the pathway
      • temperature: higher temperature, more kinetic energy, more frequent and more successful collisions.
      • concentration: higher concentration, more frequent collisions, more successful collisions.
      • pressure: increase pressure, more particles per unit volume, more frequent and more successful collisions
    • order of reaction
      • first order: the rate of reaction is directly proportional to the concentration
      • second order: the rate of reaction is proportional to the square of the change in concentration
      • zero order: the rate of reaction is not affected by the change in concentration.
    • rate equations
      • rate = k [X][Y]2
      • [X] first order [Y]2second orderdo not include zero order int this equation
      • overall order: add the powers
    • concentration-time graphs
      • 1. label axis2.half life tells if its 1st order or not3.show minimum of 2 half lives4state the values of the half lives and the units
      • calculation rate:1. draw tangent following curve 2.dy/dx include units 3.initial rate=0 seconds4.must cross line at time=0 seconds5.label axis, include units
  • factors affecting rate
    • surface area: larger surface area, more frequent and more successful collisions.
    • catalyst: speeds up rate of reaction without being used up, lowers Ea by providing and altering the pathway
    • temperature: higher temperature, more kinetic energy, more frequent and more successful collisions.
    • concentration: higher concentration, more frequent collisions, more successful collisions.
    • pressure: increase pressure, more particles per unit volume, more frequent and more successful collisions
  • molar ratios:A+2B --> C+Dwhat is the rate of formation of the compound C if the rate of B is 10moldm-3?2:1 molar ratio, 10/2=5 moldm-3
    • RATES
      • change in concentration per unit time   (mol1dm-3)
      • order of reaction
        • first order: the rate of reaction is directly proportional to the concentration
        • second order: the rate of reaction is proportional to the square of the change in concentration
        • zero order: the rate of reaction is not affected by the change in concentration.
      • rate equations
        • rate = k [X][Y]2
        • [X] first order [Y]2second orderdo not include zero order int this equation
        • overall order: add the powers
      • concentration-time graphs
        • 1. label axis2.half life tells if its 1st order or not3.show minimum of 2 half lives4state the values of the half lives and the units
        • calculation rate:1. draw tangent following curve 2.dy/dx include units 3.initial rate=0 seconds4.must cross line at time=0 seconds5.label axis, include units

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