Rate Laws: Describe how concentration affects reaction rate. Zero order: rate = k. First order: rate = k[A]. Second order: rate = k[A]².

Half-Life: Time for [A] to decrease to half its value. Only constant for first-order reactions (t₁/₂ = 0.693/k).

Arrhenius Equation: k = A×e^(-Ea/RT). Shows that rate constant increases exponentially with temperature.

Activation Energy (Ea): Minimum energy needed for reaction. Higher Ea = slower reaction, more temperature sensitive.