###### Worksheets and lesson ideas to challenge students aged 11 to 16 to think hard about balancing equations (GCSE and Key Stage 3)

*This video is an excellent introduction to the importance of stoichometry when reacting substances. A sufficient BANG is only produced when one part oxygen is mixed with two parts hydrogen. Students must have a good understanding of why we need to balance chemical equations before we introduce coefficients and mole ratios.*

#### How to balance chemical equations

GCSE and Key Stage 3 activity on how to balance chemical equations. Students balance simple equations involving concrete examples, such as wheels and cars, by adding coefficients before the object. This activity helps make the jump to more abstract chemical equations easier. Try it before you balance chemical equations – it will hopefully help students understand why we need to balance equations in the first place. (PDF)

#### Conservation of mass

GCSE activity on conservation of mass using the hydrogen balloon demonstration. Students think about why chemists balance equations. The activity uses the combustion of hydrogen as an example and links to the video above. Combustion of hydrogen gas is an engaging demonstration that will provide the ‘hook’ to introduce the more abstract concept of balancing equations. (PDF)