This is part of a lectorial (lecture tutorials) series on 5129 Combined Science (chemistry component) of the Cambridge International Ordinary Level (O Level). The curriculum is similar to any 14-16 years old single science/pure chemistry curriculum for the GCSE, IGCSE 0653 or the SEAB O Level Science 6092 chemistry. You/anyone else can track what you need/want to find through this Google Document link. So share that link, channel widely with others and subscribe. Follow me @ptet.chemistry on FB, IG, Twitter and Telegram to get connected. https://bit.ly/3yXV7w5 I am available for one-on-one private online tutoring (O/IGCSE/A/IB/any level of chemistry) for $40 an hour, contact at (+673)8656158 to arrange session. Thank you for watching, and I hope it helps. Problem 1 0:00 Problem 2 5:22 Problem 3 15:50 Problem 4 18:08 Introduction 0:00 Filtration 6:59 Evaporation 9:40 Crystallisation 11:18 Distillation 15:27