Virtual versions of real O-Level Science (Chemistry) Practical Tests. Do the experiment on the bench, but — just like the real exam — you record every observation and calculation in the laboratory notebook, and it's marked like the actual paper.
Epsom salt: find x in MgSO₄·xH₂O by heating, then identify the ions in mixture B. Observations are recorded by completing dropdown sentences — great scaffolding for a first attempt.
The same practical, but you write every observation in your own words — the notebook marks them offline against the real mark scheme's points and tells you what's missing. Exam-realistic.
Qualitative analysis: identify the three ions in salt S by wet tests, a zinc reduction (with a hydrogen "pop" test) and a manganate(VII) redox test. Observations recorded via dropdown sentences.
The same qualitative-analysis practical, but you write every observation in your own words — auto-marked offline against the real mark scheme's points.
Heat solid A (zinc carbonate) and watch it turn yellow when hot, white when cold; test the gas with limewater; then identify the ions in B and C and describe a separation technique.
The same thermal-decomposition + qualitative-analysis practical, written in your own words and auto-marked against the real mark scheme.
Identify the ions in solution P, then run a real burette titration against purple KMnO₄ — drag the tap, watch the self-indicating end-point, and calculate the Fe²⁺ concentration. Optional redox titration curve.
The same QA + redox-titration practical, with observations written in your own words and the calculations auto-marked.
Identify the two acids in W, then run an iodine clock — measure the reagents, add X to start the stopwatch, and time the blue-black as you change the concentration. Then calculate the rates.
The same QA + rate practical, with observations written in your own words and the rate calculations auto-marked.