SCH4U Unit 3: Equilibrium Review exam fully
solved & updated 2025-2026(latest version verified
for accuracy)
What is equilibrium? - answer--A state the rates of the forward and
reverse reactions are equal
What are the 4 conditions of equilibrium? - answer--1. Rates of forward
and reverse reactions are the same
2. macroscopic properties (pH, temp, conc.) are constant
3. No input or escape of any component (closed system)
4. Equilibrium can be achieved from either direction
Homogenous vs heterogenous equilibriums - answer--Homogenous: all
reactants and products are the same state
Heterogenous: all reactants and products are not the same state
, What is favourability? - answer--when something has a natural
tendency to occur more likely than others. favourability is necessary for
a reaction to establish equilibrium
What are the 3 factors of favourability? - answer--Enthalpy,
temperature, and entropy
How does enthalpy impact favourability? - answer--Exothermic
reactions are more favoured because they have lower activation energy
requirements. however, some endothermic reactions can still occur
spontaneously
How does temperature impact favourability? - answer--Endothermic
reactions are more favourable at higher temperatures. Exothermic
reactions are more favourable at lower temperatures.
What is entropy? How does entropy impact favourability? - answer--
Entropy is the measure of energy that spreads out in a reaction. Entropy
is directly proportional to disorder/chaos in a reaction. Disorder and
solved & updated 2025-2026(latest version verified
for accuracy)
What is equilibrium? - answer--A state the rates of the forward and
reverse reactions are equal
What are the 4 conditions of equilibrium? - answer--1. Rates of forward
and reverse reactions are the same
2. macroscopic properties (pH, temp, conc.) are constant
3. No input or escape of any component (closed system)
4. Equilibrium can be achieved from either direction
Homogenous vs heterogenous equilibriums - answer--Homogenous: all
reactants and products are the same state
Heterogenous: all reactants and products are not the same state
, What is favourability? - answer--when something has a natural
tendency to occur more likely than others. favourability is necessary for
a reaction to establish equilibrium
What are the 3 factors of favourability? - answer--Enthalpy,
temperature, and entropy
How does enthalpy impact favourability? - answer--Exothermic
reactions are more favoured because they have lower activation energy
requirements. however, some endothermic reactions can still occur
spontaneously
How does temperature impact favourability? - answer--Endothermic
reactions are more favourable at higher temperatures. Exothermic
reactions are more favourable at lower temperatures.
What is entropy? How does entropy impact favourability? - answer--
Entropy is the measure of energy that spreads out in a reaction. Entropy
is directly proportional to disorder/chaos in a reaction. Disorder and
