SCH4U – Rates Question and answers
verified to pass 2025
Rate of reaction - correct answer Usually obtained by measuring the rate at
which a product is formed or the rate at which reactant is consumed over a
series of time intervals
Average rate of reaction - correct answer Rate of consumption overtime is the
absolute value of the slope of the secant (range of time)
Instantaneous rate of reaction - correct answer Rate of consumption where
the slope of the curve is at that point
(specific time)
Five factors that control the speed of a chemical reaction - correct answer
Chemical nature of reactants, concentration of reactants, temperature,
presence of catalyst, surface area
Collision theory - correct answer The rate of a reaction depends on the
frequency and the proportion of collisions that convert reactants and products.
Effective collision has the correct orientation and kinetic energy
Activation energy (Ea) - correct answer The minimum energy required for an
effective collision. Serves 2 purposes-
1: to overcome electrostatic repulses and forces
2: to weaken the bonds of the reactants
Activated complex - correct answer An unstable arrangement of Adams at the
maximum potential energy point in the change from reactants to products
verified to pass 2025
Rate of reaction - correct answer Usually obtained by measuring the rate at
which a product is formed or the rate at which reactant is consumed over a
series of time intervals
Average rate of reaction - correct answer Rate of consumption overtime is the
absolute value of the slope of the secant (range of time)
Instantaneous rate of reaction - correct answer Rate of consumption where
the slope of the curve is at that point
(specific time)
Five factors that control the speed of a chemical reaction - correct answer
Chemical nature of reactants, concentration of reactants, temperature,
presence of catalyst, surface area
Collision theory - correct answer The rate of a reaction depends on the
frequency and the proportion of collisions that convert reactants and products.
Effective collision has the correct orientation and kinetic energy
Activation energy (Ea) - correct answer The minimum energy required for an
effective collision. Serves 2 purposes-
1: to overcome electrostatic repulses and forces
2: to weaken the bonds of the reactants
Activated complex - correct answer An unstable arrangement of Adams at the
maximum potential energy point in the change from reactants to products
