IGCSE Chemistry (0620) — May–June 2023, Paper 51
3 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →Question 1 · 16 marks · Practical: titration
You are going to investigate the reaction between aqueous ammonia and two different aqueous solutions of copper(II) sulfate labelled A and B (different concentrations). Experiment…
Answer this question and get it marked →Question 2 · 18 marks · Practical: qualitative analysis
You are provided with solid E. Do the tests, recording all observations. Divide solid E into two approximately equal portions in two boiling tubes. Gently heat the first portion…
Answer this question and get it marked →Question 3 · 6 marks · Practical: salt preparation
Solid cobalt(II) oxide is a base which is insoluble in water. It reacts very slowly with cold dilute sulfuric acid to form a solution of cobalt(II) sulfate. Describe how to make…
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