Filtration, evaporation and crystallisation sim
Stir, filter and then evaporate or crystallise to get salt or copper(II) sulfate back out of a mixture with sand, and see how much you recover.
Experimental techniques: separating mixtures · covers the O-Level, IGCSE, GCSE topic
Use it in your lessons
- Try it here: anyone can unlock 2 figures free, and a free account unlocks up to 5. Runs on a laptop, a Chromebook or a phone; nothing to install.
- Present it and share student links with the teacher plan, from US$5 a month, billed yearly.
- Put it on your own website or LMS for US$9, paid once, or every sim from US$29 a month.
Free guide: 12 practicals as sims, and how to run one in a lesson →
Need a version for your exact set-up? Have one made: US$49 a figure in an order of 5.
More chemistry sims
- Neutralising acid with lime simAdd weighed spatulas of calcium hydroxide or calcium oxide to dilute hydrochloric acid, stir, read the pH meter and plot pH against mass added; then lime a pot of acid soil.
- Preventing rust: barriers and sacrificial protection simEight treated iron nails rust over two weeks: paint, grease, plastic and tin as barriers, zinc and magnesium as sacrificial metals, copper making it worse. Scratch the coats, then protect a buried pipe with a magnesium block.
- Purity from melting and boiling points simMelt four unknown samples in capillary tubes in an oil bath and match them to data cards: pure substances melt sharply, impure ones lower and over a range. Then watch salty water boil above 100 °C and keep rising.
- Reactions of ethene simAdd bromine, hydrogen or steam across the C=C of ethene under the right conditions, name the product, and harden vegetable oil into margarine by adding hydrogen.
- Redox detective simRun six redox reactions, watch the oxidation numbers change and the electrons move, then tag what is oxidised, what is reduced, and the oxidising and reducing agents. All four definitions of redox, checked side by side.
- Water treatment and desalination simDrag a sample of river water through screening, sedimentation, filtration, carbon and chlorination, testing it after each stage; switch stages off to see why each one is there; then desalinate seawater two ways and treat sewage.