Redox detective sim
Run 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.
Redox: oxidation and reduction · 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
- 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.
- Bioleaching and phytomining simGrow plants on low-grade ore, burn them and dissolve the ash, or let bacteria leach a column of ore week by week, then get the copper out with scrap iron or electrolysis and weigh it.
- Earth's early atmosphere simDrag a timeline from 4.6 billion years ago to today and watch the oceans, algae, plants, limestone and coal appear; once the oceans form, carbon dioxide falls and oxygen rises; record readings and graph them.
- Methane and chlorine in UV light simShine a UV lamp on methane and chlorine in a graduated tube over water: with no UV nothing happens; with it the chlorine fades, oily drops form, the water rises, and CH₃Cl, then CH₂Cl₂, CHCl₃ and CCl₄ build up.
- Nanoparticles: surface area to volume simDrag a slider to cut a cube into smaller and smaller cubes, record the surface area and volume, and plot SA:V against 1/a to see why nanoparticles behave differently.
- Ozone layer and CFCs simOpen a CFC valve under a model atmosphere, let the years pass, and watch chlorine atoms thin the ozone layer and the UV index at the ground climb; then close the valve and see how slowly it recovers.