Read through the lesson and accompanying resources on iron and sulfur which brings together well-established practical work with the use of the particle model to explain what is happening. Students begin by looking at the properties of iron, sulfur and a mixture of the two. They draw particle diagrams to represent the elements and may also examine three-dimensional models.

The reaction between iron and sulfur is demonstrated and the product is examined.

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Students are told the product iron sulfide consists of equal numbers of iron and sulfur atoms chemically joined (combined). They are asked to model the change in a role play.