For a reaction to take place between two particles, they must collide with enough energy to break bonds
Factors that affect the rate of chemical reactions
Increasing temperature
Increasing concentration
Increasing pressure
Increasing s.a. of solid reactants
Using a catalyst
Increasing temperature
Increases speed and therefore K.E. of the reacting molecules, increasing the number of collisions and the number of molecules that have enough energy to react
Increasing concentration
Increases the number of collisions, however, over time the amount of reacting molecules will decrease and cause a decrease in the concentration
Increasing pressure
More molecules so more collisions between reacting molecules
Increasing the s.a. for solid reactants
The larger the s.a., the more of the solids particles are exposed and free to collide
Using a catalyst
Increases rate of reaction by lowering the activation energy, without chemically affecting the reaction
Endothermic reaction is the one where the products have more energy than the reactants
