Rates of reaction topic 7

• When do reactions occur

  When particles colliding and rate of reaction are increased when frequency and/or energy of collision is increased
• Catalyst is substance that:

  • Increase rate of reaction
  • Don't alter products of reaction
  • Is unchanged chemically and in mass at end of the reaction
• What amount of mass of catalyst needed to increase rate of reaction


  Small mass
• When using graphs for rate of reaction what do you plot when anylasing?


  Graph of moss or volume of product against time
• On graph what does gradient =


  Rate of reaction
• Steeper the line = greater rate of reaction
• Fast reactions finish sooner then slow reaction. What happens to fast reactions line


  Becomes horizontal
• What are enzymes?


  Biological catalysts which can control reactions in cell