Redox Reactions

Track oxygen and electrons追踪氧与电子的转移

Recognise oxidation and reduction without memorising a reaction list.

Complete this core task when your teacher assigns the topic. Use the short recall cards before class.按老师指定的知识点完成网页预习，周内用提示卡回忆；不是整章预习。

Two-lesson route

Lesson 1: oxygen transfer, electron transfer and oxidation numbers. Lesson 2: agents, colour changes and mixed practice. The three topic links below are reference sections, not three separate lessons.

Printable hint cards

Use a card when you need a starting step, then return to the question. Chapter 7 cards are on pages 2 of the collection. Print the relevant pages and cut out the cards you need.