Rate Equations | IAL Chemistry Unit 4

A complete, ready-to-teach lesson on rate equations for Pearson Edexcel International A Level Chemistry, Unit 4 (WCH14). See how the orders in a rate equation show up on graphs, how to find them from initial rates, and how they tell you which species are in the rate-determining step.

Every diagram is redrawn as editable PowerPoint shapes and builds click by click, so you can talk through each stage. Detailed teacher notes on every slide mean it works for your own teaching, a cover lesson or a new colleague.

What’s included (29 slides):

• Learning objectives slide
• Watch it: 9 step-by-step diagram slides with click-by-click builds and a caption on each
• Try it: “Find the rate equation” activity table, with a separate answer slide
• Check it: 4 quick multiple-choice questions for mini-whiteboards, with answers and explanations
• Exam tip slide: where students most often lose marks
• 6 exam-style questions (13 marks), each followed by a full mark scheme with examiner notes
• Key fact plenary slide
• Teacher notes on every slide: starter, questions to ask at each click, common misconceptions, stretch and support, plenary and homework

By the end of the lesson, students can:

• Write a rate equation and define the order with respect to a reactant
• Recognise zero, first and second order from concentration–time and rate–concentration graphs
• Use the initial-rates method to find orders, then calculate k and its units
• Link the rate equation to the rate-determining step of a mechanism

Fully editable .pptx; also opens in Google Slides and Keynote. Original resource written for the Edexcel IAL specification; not endorsed by Pearson.