Formula Builder & Practice
Learn, practise and test ionic and molecular formulae. Build ionic compounds by balancing charges and practise common molecular formulae.
Open Formula BuilderFree online tools for chemistry learners. Each resource helps develop chemical reasoning while checking calculations, formulae and key concepts.
Learn, practise and test ionic and molecular formulae. Build ionic compounds by balancing charges and practise common molecular formulae.
Open Formula BuilderCalculate relative formula masses and explore conversions between mass, moles, gas volume at r.t.p. and solution concentration.
Open calculatorWork through reacting-mass and limiting-reactant calculations using balanced equations, mole ratios and clearly displayed working.
Open calculatorCalculate atom economy from a balanced equation and see how efficiently reactant atoms become part of the desired product.
Open calculatorModel acid-base and redox titration calculations, including mole ratios, concentrations, volumes and step-by-step reasoning.
Open calculatorExplore weak-acid equilibria, buffer calculations and pH. The calculator shows the reasoning behind each stage of the calculation.
Open calculatorCompare single and multiple solvent extractions and see how the partition coefficient determines the amount extracted.
Open calculatorCalculate ion flight time, kinetic energy, flight distance and related quantities. Compare isotope flight times using clearly displayed standard-form working.
Open calculatorPlot Arrhenius data to determine activation energy and pre-exponential factor. Explore how changing temperature affects reaction rate.
Open calculatorClick any element from H to Kr to display its full electronic configuration and orbital-box diagram. Explore electron pairing, unpaired electrons and the Cr and Cu exceptions.
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