SCH4U CHEMISTRY 12 EXAM 2025/2026 QUESTIONS AND ANSWERS 100% PASS

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SCH4U CHEMISTRY 12 EXAM 2025/2026 QUESTIONS AND ANSWERS 100% PASS

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SCH4U CHEMISTRY 12 EXAM 2025/2026 QUESTIONS AND ANSWERS 100% PASS

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SCH4U CHEMISTRY 12 EXAM 2025/2026
QUESTIONS AND ANSWERS 100% PASS

Rate of forward reaction decreases and the rate of reverse reaction increases - ANS As a
system approaches equilibrium...

1. Consistent observable properties

2. Closed system - ANS Characteristics of equilibrium

Reactants and products are all the same states - ANS Homogeneous equilibrium

Reactants and products are different states - ANS Heterogeneous equilibrium

Reaction is still occurring at microscopic level even though it appears to have completed -
ANS Dynamic equilibrium

Suniv = Ssys - Ssur - ANS 2nd law of thermodynamics

Solid->liquid
Liquid->gas
Solid dissolving

Temp increasing - ANS Processes that increase entropy

1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED

, G=Hsys-T(Ssys) - ANS Gibbs free energy equation

Not spontaneous - ANS G>0

Spontaneous - ANS G<0

Reaction is at equilibrium - ANS G=0

- at all temps - ANS -H and +S

+ at all temps - ANS +H and -S

- at low temp - ANS -H and -S

- at high temps - ANS +H and +S

[Products] over [reactants]
Only uses equilibrium [ ]

*Coefficients are used at exponents* - ANS Kc expression

Products favoured - ANS Kc>1

At equilibrium - ANS Kc=0

Reactants favoured - ANS Kc<1

Ignore change in concentration - ANS If Kc>500

2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED

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