STPM Chemistry Form 6 Notes – Chemical Equilibrium (Part 4 – Final)

by BerryBerryTeacher

in Berry Reference (Notes)

Welcome back to Berry Berry Easy for the final post on Chemical Equilibrium for STPM Chemistry (Tingkatan 6). In this last part, you’ll combine all that you have learnt earlier and apply it in a variety of conditions. It might seemed a lot, but we are thoughtful enough to present it to you in table form for easy referencing. In this part, you’ll focus on ‘Factors affecting the rate of reaction, rate constant, equilibrium constant and composition of equilibrium mixture’ and ‘Perturbations and shifts’ under the main topic of Chemical Equilibrium.

(Tips: The one single tip for this part is berry berry simple and unambigious. MEMORISE the TABLES below! That’s all. You’ll need to have in the back of your head, the entire table shown below. That’ll help you greatly in understanding the overall chapter of chemical equilibrium. So, please attempt to memorise and of course, understanding the contents within the tables.)

STPM Chemistry Form 6 Notes – Chemical Equilibrium (Part 4 – Final)

Factors affecting the rate of reaction, rate constant, equilibrium constant and composition of equilibrium mixture

Factor Rate of reaction Rate constant (k) Equilibrium constant (Kc, Kp) Composition of equilibrium mixture
Increase in temperature Endothermic:↑ Exothermic: ↓ Endothermic: Yield of the product↑ Exothermic: Yield of the reactant↑
Decrease in temperature Endothermic:↓ Exothermic: ↑ Exothermic: Yield of the product↑ Endothermic: Yield of the reactant↑
Increase in pressure X X  
Decrease in pressure X X  
Catalyst X X

Note: ↑ increases & ↓ decreases

Perturbations and Shifts

Applied Stress System’s adjustment Direction of shift
Add reactant Remove reactant To the right
Add product Remove product To the left
Decrease volume Decrease gas volume To the side with fewer molecules
Increase volume Increase gas volume To the side with more molecules
Decrease temperature React to generate heat To the exothermic direction
Increase temperature React to absorb heat To the endothermic direction

We’re done with the moderately difficult chapter of Chemical Equilibrium which is berry berry important in exams and real life application. Whatever you have learnt in this series of notes, is applicable up to university level, so don’t just learn for the sake of exams.

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February 8, 2011
February 9, 2011

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