you are here:home> advanced skills teachers> key stage 4 Please choose an topic from the menu below by clicking on the appropriate icon to open in Word or Pdf format. Alternatively, save the Word or Pdf documents to your machine by right-clicking (or control-click if using a Mac) the icons and selecting save as. # Topic Word Pdf 4.1a Atomic structure and the periodic table 4.2a Useful products from organic sources 4.3a Earth and atmosphere 4.4a Useful products from metal ores, rocks and air 4.5a Quantitative chemistry 4.6a Chemical reactions 4.7a Rates of reaction/reactions involving enzymes 4.8a Energy transfer in reactions 4.9a Circuits and electric charge 4.10a Forces and motion 4.11a Waves: Electromagnetic spectrum 4.12a Waves: Sound and ultrasound 4.13a The solar system and the wider universe 4.14a Energy transfer 4.15a Electromagnetic effects 4.16a Radioactivity