1. © Nuffield Foundation 2013 Practical Work for Learning Combustion of iron wool

2. © Nuffield Foundation 2013 Learning outcome You will be able to use a scientific model to explain what happens to the mass of iron wool during combustion

3. © Nuffield Foundation 2013 What will happen when the iron wool combusts? Make your prediction. A B C

4. © Nuffield Foundation 2013 Iron is a solid

5. © Nuffield Foundation 2013 Draw diagrams to show the particles.

6. © Nuffield Foundation 2013 Iron is a solid. Oxygen is a gas. Iron reacts with oxygen in the air to form a new compound called iron oxide. During the reaction, the atoms of iron and oxygen combine together. Iron oxide is a solid. It can be seen on the surface of the iron wool. Because the oxygen has added to the iron, the iron wool is heavier than at the start. Explaining the change in mass