Reaction

• Rate of reaction

  The speed of a chemical reaction. Some are very fast and some are very slow
• The rate of a reaction has something to do with what is happening in a microscopic level
• Why are some reactions faster than others?

  • Reaction takes place when particles collide with a certain amount of energy
  • The minimum amount of energy needed for the particles to react is called activation energy
• Collision theory


  - For chemical reaction to occur, reactant particles must collide with sufficient energy and proper orientation

  - not all collision between molecules will result in the formation of product

  - the reactant molecule should be in correct orientation when they collide
• Factors affecting the rate of reaction

  • Temperature
  • Surface area of reactants
  • Concentration of
  • Presence of a catalyst
• Temperature


  The higher the temperature the faster the rate of reaction
• Surface area of reactants

  The smaller the pieces the larger the surface area. Therefore more collisions and more chances of reactions
• Concentration of reactants


  At the higher concentration, there are more particles in the same amount of space. Therefore particles are most likely to collide
• Presence of a catalyst


  It is a substance that changes the rate of reaction without being used up in a reaction. They never produce more product, they just speed up the reaction
• Importance of a catalyst


  • Products can be made more easily
  • Time and money are saved
  • Reduce the need for higher temperature, saving fuel and reducing pollution