Reactor
Wire atoms together into the molecule the round demands — every bond must respect valence — then nudge an equilibrium in the direction it asks for.
How to play
Rounds alternate between two challenges. In build rounds you assemble a target molecule from loose atoms; in equilibrium rounds you tip a reversible reaction the required way using levers, applying Le Chatelier's principle.
- Click two atoms on the grid to bond them, respecting each element's valence.
- Right-click a bond to split it if you wired the wrong connection.
- A build is complete when the formula matches and every atom's valence is satisfied.
- In equilibrium rounds, toggle levers (concentration, temperature and more) to shift the reaction toward the goal.
Controls
- Desktop: left-click two atoms to bond, right-click a bond to split, click levers to shift equilibrium; Daily/Practice and New in the bar.
- Phone & tablet: tap two atoms to bond and tap levers — note that splitting a bond uses right-click, so a mouse is handy for build rounds.
Tips & strategy
- Count remaining valence before bonding — carbon wants four links, oxygen two, hydrogen one.
- Build the carbon skeleton first, then cap the dangling bonds with hydrogen.
- For Le Chatelier rounds, remember that adding a reactant or removing a product drives the reaction forward, and heat behaves like a reagent for endothermic reactions.
What you'll learn
Reactor blends molecule construction with equilibrium reasoning, grounded in real valence rules and conservation.
- Skills: chemistry, chemical equilibrium, valence, conservation of mass
- Best for: roughly grades 10–12 (ages 15+)
- For parents & teachers: chemical equilibrium and bonding.
About Reactor
Reactor blends molecule construction with equilibrium reasoning, grounded in real valence rules and conservation of mass. It's an original, free browser game with a six-round run plus daily and practice modes.
A free, original browser game on PlayPendium — no download, no install. Browse all games →
