Simple different types of chemical reaction. I've uploaded this after spending a lot of time looking for a resource relating to simple reactions. You could carry out a demo of these reactions alongside the lesson

These are a series of powerpoints I used to teach Topic 2 - Compounds WJEC to my year 10 class

Powerpoint to aid DNA extraction

First three lessons on diet and healthy eating year 8

Set of lesson power points for acid/alkali topic. Revision game can be a bit excitable. I usually split the whiteboard into team one and team two. Each pupil gets a card. The number on the card is the team they are in. I read a definition, if they have the key word they must beat the other team to the board, and correctly spell the key word.