H2 Chemistry Notes: Topic 8 — Reaction Kinetics

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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: Topic 8 - Reaction Kinetics cover?
A: Nail rate laws, experimental determination of orders, Arrhenius analysis, and catalysis narratives for Core Idea 3 (Reaction Kinetics).

Kinetics questions test both experimental planning and mathematical fluency.

This guide summarises rate-law theory, data analysis routines, and catalytic mechanisms tailored to the 2026 examination format.

Further practice resources sit at 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. Core Idea 3 Topic 8 is assessed across Papers 1–3.

Quick revision box

What this topic tests: Rate laws, order determination, Arrhenius relationships, and catalyst reasoning.
Top mistakes to avoid: Treating coefficient as order by default; poor graph interpretation; superficial catalyst explanations.
20-minute sprint plan: 5 min order-method recap; 10 min initial-rate/graph questions; 5 min catalyst and Arrhenius explanation.

1 Rate Laws and Orders

General rate law for reaction aA + bB -> products:

$\text{rate} = k [A]^m [B]^n$

Overall order	Rate expression	Units of k
0	rate = $k$	$\pu{mol.L-1.s-1}$
1	rate = $k [A]$	$\pu{s-1}$
2	rate = $k [A]^2$	$\pu{L.mol-1.s-1}$

Type	Example	Mode of action
Homogeneous	$H^+$ catalysing ester hydrolysis.	Forms intermediates in same phase.
Heterogeneous	$\ce{V2O5}$ in Contact process.	Adsorption weakens bonds, increasing reaction rate.
Enzyme	Catalase breaking down $\ce{H2O2}$ .

H2 Chemistry Notes: Topic 8 — Reaction Kinetics

Quick revision box

1 Rate Laws and Orders

1.1 Units of Rate Constant

2 Determining Orders Experimentally

2.1 Initial Rates Method

2.2 Continuous Monitoring

3 Arrhenius Equation

4 Mechanisms and Rate-Determining Step (RDS)

5 Catalysis

6 Worked Example

7 Practical Contexts

8 Common Missteps

9 Quick Drills

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