Course Introduction This course covers C3.1: Introducing Chemical Reactions, which is part of Module C3: Chemical Reactions.  This is examined on Paper 3 of the GCSE OCR Combined Science A Course. This course contains no quiz for the calculations section - examples are included throughout the notes instead.  Make sure to attempt the questions yourself before looking at the solutions!

Tests for Gases: Oxygen: Relights a glowing split   Carbon dioxide: Turns limewater milky   Chlorine: Has a bleaching effect   Hydrogen: Causes lighted splint to make 'popping' noise