Chemistry worries about atoms and their structure - following general trends in the periodic table. Alkane or alkene is the question ;) This page will contain all the gcse revision notes needed, specific to the IGCSE Edexcel Specification.

States of Matter
Diffusion and Dilution
Elements, Mixtures and Compounds
Separating Techniques
Atomic Structure
Arrangement of Electrons
Chemical Bonding
Structure and Properties of Ionic Bonding
Structure and Properties of Covalent Bonding
Metallic Bonding