CAIE IGCSE Chemistry 0620/62 May/June 2023 – Alternative to Practical model answers: apparatus ID & safety, rate experiment data/analysis, temperature control, accuracy improvements, and titration tips.  Includes gas tests (CO₂ → limewater), flame/ion tests, and a worked composition-by-residue procedure (e.g., SiO₂ from polish) with clear, exam-style reasoning.