REACTION PROFILES + REACTION ENERGY CHANGES

When do chemical reactions occur

when reacting particles collide with each other and with sufficient energy

What is activation energy

the minimum amount of energy that particles must have to react

What do reaction profiles show

the relative energies of reactants and products, activation energy, overall energy change

What occurs during a chemical reaction

energy must be supplies to break bonds in reactants, energy is released when bonds in the products are formed

How can energy needed to break bonds/energy released when bonds are formed be calculated

bond energies

What is the overrall energy change of the reaction

(sum of energy needed to break bonds in reactions) minus (sum of energy released when bonds in the products are formed)

What is the difference is energy in exothermic reactions

energy released from forming new bonds is greater than energy needed to break bonds

What is the difference is energy in endothermic reactions

energy needed to break existing bonds is greater than the energy released from forming new bonds