PORTAGE LEARNING CHEM 104 MODULE
ONE TO SIX EVALUATION BANK 2026
COMPLETE ANSWERS GRADED A+
⩥ What are the 4 important principles of equilibrium?.
Answer: 1) All reactions eventually reach equilibrium
2) All species are present at equilibrium
3) Equilibrium is dynamic (though no observable changes)
4) Le Chatelier's principle - but will never return exactly to initial
equilibrium concentration
⩥ Define LeChatelier's principle.
Answer: When a chemical system at equilibrium is disturbed, it returns
to equilibrium by counteracting disturbance
⩥ How do gases affect position of equilibrium?.
Answer: Change in pressure of gas in the system will cause a shift
Addition of gas not in system has no effect
⩥ How does temperature affect equilibrium?.
Answer: Temp = stress
, Heat considered a reactant in endothermic reactions and a product in
exothermic reactions
⩥ How do catalysts affect equilibrium?.
Answer: They have no effect
⩥ How does the addition of a solvent (ex. water) affect equilibrium?.
Answer: Causes a decrease in concentration of all aqueous solutions -
shifts to side with greatest amount of aqueous solutions
⩥ What is the equilibrium constant (Keq/Kc/Kp)?.
Answer: - Products over reactants, raised to power of respective
coefficients in balanced chemical equation
- Has no units
- Solids and pure liquids not included
- Always positive, but can be large or small
⩥ What is the magnitude of Kc?.
Answer: Measures yield of reaction at equilibrium
⩥ Describe the directionality of Kc.
Answer: Kc > 1 = product-favored
Kc < 1 = reactant-favored
ONE TO SIX EVALUATION BANK 2026
COMPLETE ANSWERS GRADED A+
⩥ What are the 4 important principles of equilibrium?.
Answer: 1) All reactions eventually reach equilibrium
2) All species are present at equilibrium
3) Equilibrium is dynamic (though no observable changes)
4) Le Chatelier's principle - but will never return exactly to initial
equilibrium concentration
⩥ Define LeChatelier's principle.
Answer: When a chemical system at equilibrium is disturbed, it returns
to equilibrium by counteracting disturbance
⩥ How do gases affect position of equilibrium?.
Answer: Change in pressure of gas in the system will cause a shift
Addition of gas not in system has no effect
⩥ How does temperature affect equilibrium?.
Answer: Temp = stress
, Heat considered a reactant in endothermic reactions and a product in
exothermic reactions
⩥ How do catalysts affect equilibrium?.
Answer: They have no effect
⩥ How does the addition of a solvent (ex. water) affect equilibrium?.
Answer: Causes a decrease in concentration of all aqueous solutions -
shifts to side with greatest amount of aqueous solutions
⩥ What is the equilibrium constant (Keq/Kc/Kp)?.
Answer: - Products over reactants, raised to power of respective
coefficients in balanced chemical equation
- Has no units
- Solids and pure liquids not included
- Always positive, but can be large or small
⩥ What is the magnitude of Kc?.
Answer: Measures yield of reaction at equilibrium
⩥ Describe the directionality of Kc.
Answer: Kc > 1 = product-favored
Kc < 1 = reactant-favored
