3.9 - 3.16 Rates of reaction paint must not dry too quickly 3.9 - 3.16 What is rate? How fast a chemical... https://www.mychem.co.uk/index.php/igcse-chemistry/physical-chemistry/rates-of-reaction Any measurable factor which changes as a reaction proceeds can be used to measure the rate. The gradient of graphs give a reading for the reac...