Rates

• If rate is proportional to the concentration of reactant squared, reaction is second order 

   
• Reaction is first order 

  If rate is proportional to concentration of reactant
• Zero order

  • rate is not affected by concentration of reactant at all
• 2nd order example

  • concentration of reactant doubled
  • rate x4
• 1st order example

  • concentration of reactant doubled
  • rate doubled
• 0 order example

  • concentration of reactant doubled
  • rate doesn't change
• rate equation includes constant (k), concentration of reactants and order as their powers
• 1st order reactions have constant half lifes
• 2nd order reactions don't have constant half lifes
• in rate concentration graphs

  • 0 order reactants give a horizontal line
  • 1st order reactants give a sloping line
  • 2nd order reactants give a curved line