Rate of chemical change 2

Explaining the rate of chemical reaction
1. Need successful reactions
  1. Particles hitting into each other with enough force
2. The number of successful collisions is a small percentage of the total number of collisions taking place in a given time
3. Collision frequency
  1. Number of successful collisions per second
  2. High the frequency the higher the rate of reaction
Factors affecting rate of reaction
1. Temperature
  1. Higher temp increases the mean velocity of the particles
  2. Higher collision frequency because faster particles more successful reactions
  3. Higher collision frequency high reaction rate
2. Concentration of the reactants
  1. Increasing concentration increases amount of reactants in the same volume
  2. More particles higher collision frequency
  3. High collision frequency high reaction rate
3. Surface area
  1. Increasing surface area allows more of the reactants to collide with each other with enough energy
  2. Higher collision frequency higher rate of reaction
Catalyst
1. Increase rate of reaction but remain chemically unchanged at the end of the reaction
2. Many catalyst only work on certain reaction
3. It works by creating a surface on which the reaction molecules can collide with each other-this reduces the energy needed for a collision to be successful
4. More particles will have the minimum amount of energy required, increasing the collision frequency
Using catalyst lowers cost of industrial reaction and preserves the worlds resources

Resource summary

	Created by danielberthaur over 10 years ago