Catalysts and Energy of Reactions

exam 2, chem 116, WVU spring '26

Catalysts don’t affect the [ ] of the reaction, but they do lower the [ ]

overall energy, activation energy

K

rate constant

K changes with __

temperature

Endothermic

positive ΔH, products have more energy than reactants

Exothermic

negative ΔH, products have less energy than reactants

Once Ea is reached, the reaction can __

yield products or keep the reactant the same (more energy needed)

Ea

minimum amount of energy needed for the reaction to take place

Catalysts don’t affect the __ of the reaction

heat

Reaction rate [ ] as the reaction proceeds because [ ] reactants are available

decreases, less

First degree reaction

if A doubles, rate doubles

Second degree reaction

if A doubles, rate is squared (= 4)

0 degree reaction

rate is independent of concentration