Reactions & Redox

Practise balancing chemical and redox equations with molecule models, assign oxidation numbers rule by rule, and predict which metals displace others in salt solutions from standard electrode potentials.

12 interactive Chemistry simulations on reactions & redox.

Conservation of Mass and the Laws of Chemical Combination – Open and Closed Systems Chemistry · Reactions & Redox A virtual lab on a balance: burn magnesium, react calcium carbonate with hydrochloric acid and form a precipitate in... Ages 13–14
Physical and chemical changes – evidence bench Chemistry · Reactions & Redox A virtual test bench with seven changes: melting ice, dissolving salt, boiling water, burning steel wool, rusting... Ages 13–14
Balancing redox equations – the electron balance method Chemistry · Reactions & Redox Step by step: assign oxidation numbers to each element, find which ones gain or lose electrons, write the oxidation... Ages 15–16
Balancing chemical equations – coefficients, molecule models and practice game Chemistry · Reactions & Redox Use the up/down buttons in front of each formula to set coefficients until the number of atoms is the same on both... Ages 13–14
Limiting Reactant and Percentage Yield – Stoichiometry with Particles Chemistry · Reactions & Redox Choose a reaction (2H₂ + O₂ → 2H₂O, N₂ + 3H₂ → 2NH₃, CH₄ + 2O₂ → CO₂ + 2H₂O, Fe + S → FeS), set the amounts of the... Ages 15–16
Empirical formula lab – magnesium oxide, water of crystallisation and combustion analysis Chemistry · Reactions & Redox A virtual practical for finding formulas from experimental masses. Burn magnesium in a lidded crucible and heat to... Ages 16–17
Reactions in solution bench – precipitation, acid–base, redox and net ionic equations Chemistry · Reactions & Redox Mix any two of fifteen ionic solutions, predict the outcome with the solubility rules, then see what happens: a... Ages 16–17
Metals in salt solutions – predicting reactions from standard electrode potentials Chemistry · Reactions & Redox Dip a strip of Mg, Zn, Fe, Cu or Ag into CuSO₄, AgNO₃, FeSO₄ or ZnSO₄ solution. Students predict whether a reaction... Ages 17–18
2H₂ + O₂ → 2H₂O – sparking a hydrogen explosion Chemistry · Reactions & Redox A mixture of H₂ and O₂ gas in a flask does not react at room temperature. Click Ignite (or tap the flask): the spark... Ages 13–14
Redox colour tests – KMnO₄ and KI, vanadium oxidation states and Fe²⁺ titration Chemistry · Reactions & Redox Tests screen: add acidified KMnO₄ (purple → colourless) or acidified K₂Cr₂O₇ (orange → green) drop by drop to... Ages 15–16
Molar Volume of a Gas – Measure It and Use pV = nRT Chemistry · Reactions & Redox A virtual lab: react weighed magnesium or calcium carbonate with excess hydrochloric acid, or heat copper(II)... Ages 13–14
Oxidation Numbers – Practice with the Rules Chemistry · Reactions & Redox Choose a compound or ion (KMnO₄, H₂SO₄, NH₄⁺, Fe₃O₄, K₂Cr₂O₇, H₂O₂, NaH, SO₄²⁻…), enter the oxidation number of each... Ages 15–16