IGCSE Chemistry - Chromatography (12.3) скачать в хорошем качестве

IGCSE Chemistry - Chromatography (12.3)

Cambridge IGCSE Chemistry - The Complete Course: 🎓 Complete Teaching Resource (including past exam questions and mark schemes organised by chapter): https://www.tes.com/teaching-resource... 🎓 Student resource (PDF only): https://www.tes.com/teaching-resource... 🎓 All the videos (the complete library on Patreon):   / igbiocomplete   Cambridge IGCSE Chemistry (0620/0971) Chapter 12 - Experimental techniques and chemical analysis Topic 12.3 - Chromatography For exams from 2025 (core and extended) As always this video follows the Cambridge syllabus exactly and contains absolutely everything you need to know for your final exam! Other lessons in this chapter: 12.1 - Experimental design:    • IGCSE Chemistry - Experimental design (12.1)   12.2 - Acid–base titrations: https://www.patreon.com/posts/igcse-c... 12.4 - Separation and purification: https://www.patreon.com/posts/igcse-c... 12.5 - Identification of ions and gases:    • IGCSE Chemistry - Identification of ions a...   My other channels:  ‪@igpecomplete‬  ‪@ocrpecomplete‬ Timestamps: 0:00 Intro 0:29 Chromatography of coloured substances 1:30 Interpreting chromatograms 2:43 Chromatography of colourless substances (extended) 3:06 Calculating Rf (extended) Core content: 1) Describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solvent 2) Interpret simple chromatograms to identify: (a) unknown substances by comparison with known substances (b) pure and impure substances Extended content: 3) Describe how paper chromatography is used to separate mixtures of soluble colourless substances, using a suitable solvent and a locating agent (knowledge of specific locating agents is not required) 4) State and use the equation for Rf: Rf = distance travelled by substance / distance travelled by solvent