Science KS 3 Unit 9H Using Chemistry

In this unit pupils:

• find out more about how chemical reactions can be used as an energy source.
• consider how chemical reactions are used to make new materials.
• model chemical reactions as the rearrangement of atoms, and use the model to explain that matter is not lost.
• represent chemical reactions by word and/or symbol equations.

In scientific enquiry pupils:

• consider how the particle model and knowledge of gases helped change earlier ideas about burning.
• consider how scientists work together to develop a new product.
• make observations and measurements of temperature, mass and voltage.
• investigate changes in mass when magnesium burns.

This unit is expected to take approximately 7 hours.

OTHER RESOURCES

• secondary sources, eg video, CD-ROMs, illustrating the burning of a range of fuels, eg household waste in a power station
• equipment for making simple voltaic cells
• information about chemical heaters, eg meals for climbers, hand warmers for Arctic explorers
• secondary sources or artefacts illustrating a range of materials, eg textiles, plastics, pharmaceuticals, toiletries, processed foods
• case histories illustrating the development of a new product, eg vacuum cleaner, food product
• simulation software illustrating the rearrangement of atoms in chemical reactions
• secondary sources providing information about Priestley, Lavoisier and earlier ideas about burning