hh

• Rate of chemical reaction

  Reaction rates
• Collision Theory


  • Collision between reactant molecules may or may not result in a successful chemical reaction
  • Not all collisions between the molecules result in the formation of these products
• Temperature


  An increase in temperature typically increases the rate of reaction
• Nature of reactants


  • Reaction rate variation is dependent on which substances are reacting
  • Fast reactions include acid reactions, the formation of salts and ion exchange
  • Ionic compounds react faster than covalent compounds
  • Reactions that involve solids are slower compared to reactions in liquids
  • Reactions that involve gases are faster compared to reactions in liquid
• Surface area of reactants


  • Increased surface area exposes more particles to the other reactant
  • Greater chance of particles colliding, which leads to more successful collisions per second
  • The rate of reaction increases
• Concentration of reactants


  • Increase in the concentration of reactants increases the rate of reaction
  • Ions and molecules interact to form a new compound on increasing the concentration
• Catalyst


  • A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change
  • Examples: Kalburo or Calcium carbide