A suite of GCSE science courses developed in partnership with the University of York

Amendments and supplementary information: Additional Science

All through these supplementary notes, remember that you must carry out your own risk assessment and take suitable precautions.

C5 Chemicals of the natural environment

Activity AC5.7 'Salts crystallizing from solution'
The requirements list says to use 60 g magnesium sulfate and 2 g potassium chromium sulfate per 100 ml. This should be 6 g magnesium sulfate.

Activity AC5.18 'Electrolysis of lead bromide'
This diagram shows how to set up the experiment.
>>Download Lead bromide electrolysis (237 KB)

P6 Wave model of radiation

Activities AP6.3 'How a transverse wave moves' Ap6.4 'How a longitudinal wave moves', AP6.7 'How does changing frequency affect wavelength?' and AP6.12 'Ripples in multimedia waves' all make use of Multimedia Waves. This software is available from:
Cambridge Science Media
. Email: sales@csmedia.demon.co.uk

Activity AP6.23 A closer look at the spectrum
This demonstration involves the dispersion of white light, and detection of infra-red beyond visible red in the spectrum. Critical apparatus items are:

  • Filament light source. This must run hot enough to produce infra-red. Use either an intense light source or an OHP.

If you are using an OHP, use books or some other opaque objects to make a narrow gap of only about 1 mm as the light source. A narrow gap will improve definition in each part of the spectrum, including the infra-red. (Clamp the prism to a lab stand in front of the OHP mirror, in the path of the light beam.)

  • High dispersion prism
  • Filter to absorb the visible light but transmit infra-red
    e.g. black perspex 962 from The Plastic Shop
    OR the inside from an unwanted floppy disk.
  • Camera which is sufficiently sensitive to infra-red

Related experiments

In class
Students use their camera phones to "see" the output from an IR remote control.

At home
Students can use a TV remote as an infra-red source and a camera phone as infra-red detector, trying things around at home - black plastics and any other unusual materials, such as:

  • paper (try increasing the number of sheets one by one)
  • glass, e.g. a drinking glass
  • water (find a container that the beam will pass through and then fill it with water)
  • lots of different plastics, e.g. a plate, plastic bags, transparent plastic, black plastic, a CD
  • metals, e.g. a tin, aluminium foil, a foil-type crisp packet
  • the back disk from an old unwanted floppy disk (break open the case to remove it)
  • a leaf
  • wood
  • stone


To access CLEAPSS leaflet PS67 Practical Activities in the New Science GCSEs
Go to the CLEAPSS members' area on the CLEAPSS website. The username and password you will need is on your CLEAPSS Science Publications CD-ROM.

If you discover any difficulties not mentioned by CLEAPSS, please contact Emma Palmer who will either resolve the issue or forward it to CLEAPSS.