“Review” for Topic 5 and 6

Enthalpy level diagram

energy given out, ∆H is negative activation energy energy necessary to get the reaction going REACTION CO-ORDINATE ENTHALPY energy given out, ∆H is negative reactants products

energy necessary to get the reaction going activation energy energy necessary to get the reaction going REACTION CO-ORDINATE ENTHALPY Energy taken in and now stored in the bonds. ∆H is positive products reactants

Enthalpy level diagram

Increased Temperature Maxwell-Boltzmann energy distribution curves With a Catalyst

the reactant concentration changes with time in a typical chemical reaction

2NO2(g)  2NO(g) + O2(g) product product reactant the reactant and product concentration changes with time in a typical chemical reaction