Factors affecting rate of reaction.

Rate of reaction is increased when:

  • The temperature is increased
  • The concentration of a dissolved reactant is increased
  • The pressure of a reacting gas is increased
  • Solid reactants are broken into smaller pieces
  • A catalyst is used

Rate of reaction Graphs

Graph showing rates of reaction under changing conditions. At a lower temperature, lower concentration, or with larger pieces, the rate of reaction is slower than at higher temperatures, higher concentrations, or with smaller pieces (http://www.bbc.co.uk/schools/gcsebitesize/science/images/gcsechem_19.gif)

  • The steeper the line, the greater the rate of reaction.
  • Reactions are usually fastest at the beginning, when the concentration of reactants is greatest. When the line becomes horizontal, the reaction has stopped.
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