Lesson Notes By Weeks and Term v4 - SHS 2

Lesson Video

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Performance objectives

• Define key terms like rate constant and order of reaction.
• Construct rate equations from experimental data.
• Analyse graphs to determine the order of reactions.
• Solve problems involving rate equations and half-life.
• Explain the rate-determining step.

Lesson summary

Welcome, future scientists! Today, we delve into a fascinating aspect of chemical reactions called Chemical Kinetics. It's not just about *what* happens in a reaction, but *how fast* it happens. Think about how quickly a piece of paper burns compared to how slowly an iron gate rusts. Why does powdered kenkey spoil faster than the solid ball? Why do doctors tell you to take medicine every 8 hours? The answers lie in understanding the rate of reactions. This knowledge is crucial for controlling processes in industries, from making medicines to producing fertilizers for our cocoa farms.

Lesson notes

A. The Rate Equation (Rate Law)

For a general reaction: `aA + bB → cC + dD`

The rate of the reaction is often related to the concentration of the reactants by an equation called the rate equation or rate law.

Rate = k[A]ˣ[B]ʸ

Evaluation guide

• Construct rate equations from experimental data, analyze graphs to deduce the
• order of reactions and solve problems involving the rate expression.
• Collaborative Learning:
• In mixed gender group where applicable, distinguish between the terms rate constant and