Balance

Adjust the coefficients in front of each species until the atom counts on both sides of the reaction are equal. Then take it further: identify the limiting reagent and predict the yield.

• Use the steppers to set each coefficient up or down
• Balance every element so the totals match left and right
• Find the limiting reagent that caps the reaction
• Work out the yield to complete the round

• Daily equation, the same one for everyone today
• New Practice for fresh equations

• Desktop: click the plus and minus steppers to set coefficients; a hint can reveal one
• Phone & tablet: tap the steppers to adjust coefficients

• Balance the most complex molecule first, then clean up single elements last
• Save free elements like oxygen and hydrogen for the final adjustments
• Whole-number ratios only, scale the whole equation down if everything is even

Balance is a chemistry puzzle about balancing equations, juggling limiting reagents and yield so atoms are conserved on both sides.

• Skills: balancing chemical equations, conservation of mass, limiting reagents, stoichiometry
• Best for: roughly grades 9–12 (ages 14+)
• For parents & teachers: a focused workout on a skill students often struggle with.

Adjusting coefficients until atom counts match on both sides is balancing a chemical equation, and it is conservation of mass written down.

Carrying on to the limiting reagent and the predicted yield is the original extension.

That second step is where the balanced equation earns its keep. Coefficients are ratios, so once they are right they tell you which ingredient runs out first — and the reactant you have least of in molar terms is rarely the one you have least of by weight.

Balance is a chemistry puzzle about balancing equations, limiting reagents and yield. It's an original, free browser game built in-house for PlayPendium.

A free, original browser game on PlayPendium. No download, no install.