H2 Chemistry Notes: CORE IDEA 3, Topic 9 - Chemical Equilibria

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11 Feb 2025, 00:00 Z

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Azmi·Senior Chemistry Specialist

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Q: What does H2 Chemistry Notes: CORE IDEA 3, Topic 9 - Chemical Equilibria cover?
A: Master equilibrium constants, Le Chatelier shifts, and quantitative problem-solving for Core Idea 3 (Chemical Equilibria) in the 2026 H2 Chemistry syllabus.

Equilibrium mastery blends conceptual understanding with algebraic manipulation. This note covers $K_{c}$ , $K_{p}$ , reaction quotient reasoning, and Le Chatelier justifications tailored for the 2026 exam style.

Supplement with practice resources from https://eclatinstitute.sg/blog/h2-chemistry-notes.

Status: SEAB H2 Chemistry (9476, first exam 2026) syllabus and Chemistry Data Booklet last checked 2026-01-13 (both PDFs last modified 2026-01-13). Core Idea 3 Topic 9 remains assessed across Papers 1–3.

Stage	$\ce{N2O4}$	$\ce{NO2}$
Initial	$C$	$0$
Change	$-x$	$+2x$
Equilibrium	$C - x$	$2x$

Stage	$\ce{SO2}$	$\ce{O2}$	$\ce{SO3}$
Initial	$0.200$	$0.200$	$0.200$
Change	$-2x$	$-x$	$+2x$
Equilibrium	$0.200 - 2x$	$0.200 - x$	$0.200 + 2x$

H2 Chemistry Notes: CORE IDEA 3, Topic 9 - Chemical Equilibria

1 Defining Equilibrium Constants

2 Reaction Quotient Q

3 Le Chatelier's Principle

4 ICE Table Method

5 Worked Example

6 Industrial Applications

6.1 Haber Process $\ce{N2 + 3H2 \leftrightharpoons 2NH3}$

6.2 Contact Process $\ce{SO2 + 1/2O2 \leftrightharpoons SO3}$

7 Common Misconceptions

8 Quick Drills

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