chemical recations

• Types of chemical reactions

  • Exothermic reactions (release energy to surroundings)
  • Endothermic reactions (absorb energy from surroundings)
  • Neutralisation reactions (between acids and bases or acids and alkalis)
  • Thermal decomposition reactions (use thermal energy to break one substance down into others)
• Conditions that can alter the rate of chemical reactions

  • Catalysts
  • Surface area
  • Temperature
  • Concentration
  • Size of reaction vessel
• How reactions rely on particles colliding

  1. Particles colliding in correct alignment (orientation)

  2. Particles colliding with enough energy (activation energy)

  3. More frequent collisions between particles = faster reaction
• Increasing concentration


  Increases number of particles in reacting substances, more likely to collide and react, increasing rate of reaction
• Increasing surface area


  Increases rate of reaction because reactions only happen at the surface, where particles can come into contact
• Increasing temperature


  Increases rate of reaction because particles have more kinetic energy, move around faster, collide more frequently
• Decreasing size of reaction vessel


  Particles in reaction will be closer together, collide and react more frequently
• Catalyst


  Substance that increases the rate of reaction without being used up in the reaction
• whats a catalyst


  substance that increases the rate of reaction without being used up in the process