Amino Acids & Chromatography | A level Chemistry Exam Question Walkthrough

This video is a full A Level Chemistry exam question walkthrough, taking you through the reasoning, mark‑earning points, and practical chemistry examiners expect. The walkthrough uses colour‑coded annotations: purple for exam‑marking points, and red/blue for the thinking‑out‑loud development, so you can clearly see what earns marks and what helps you understand the chemistry. This walkthrough is suitable for AQA, Edexcel and OCR, and fully relevant to Cambridge International AS/A Level Chemistry, Edexcel International A Level (IAL), IB Chemistry HL/SL, AP Chemistry, CBSE/ISC Class 12 Chemistry, Sri Lankan A Levels, African A Level systems, and Grade 12 Chemistry worldwide. 📄 Download the full exam question https://drive.google.com/file/d/1Df5HVZB3NW7ksvznElHtoGojJF85GZS-/view?usp=drive_link 📄 Links directory for all YouTube videos https://drive.google.com/file/d/1s3I5prjbJRR1U1lcKpXO9TQpQMaVoP66/view ⭐ What this walkthrough covers • Drawing the structure of a peptide from amino acid residues • Understanding skeletal formulae of amino acids • Hydrolysing peptides and identifying the products • Common problems during chromatography • Why amino acids separate on a chromatogram • Developing the chromatogram using ninhydrin • Calculating Rf values accurately • Mark‑earning wording vs supporting explanation • Links to AQA Required Practicals and OCR PAGs • How to structure answers for full marks ⭐ Chapters 00:00 Intro & Socials 00:05 Drawing the Structure of a Peptide 03:16 How to Use this Walkthrough 03:32 The Skeletal Formula of Amino Acids 05:25 Hydrolysing Peptides 06:57 Problems during Chromatography 09:29 Why Amino Acids Separate 11:09 Developing the Chromatogram 12:35 Calculating Rf Values ⭐ How this was made This walkthrough was created using slide‑based explanations, with colour‑coded annotations to separate exam‑marking points from the thinking process. You can pause, rewatch, and build your own written answers from the structure shown. ⭐ Connect with Us 📸 Instagram: @chemistrytutor123 🎵 TikTok: @chemistrytutor123 📧 Email: thechemistrytutor123@gmail.com ⭐ Hashtags #ALevelChemistry #ChemistryRevision #ExamWalkthrough #InternationalAlevel #IBChemistry #APChemistry #CBSE #ISC #Grade12Chemistry #EdexcelIAL #CambridgeInternational #AQA #OCR #Edexcel