Reaction Lab lesson plans
Each one is a class period with everything to run it: a teacher plan, a student worksheet, an exit ticket with answers, and the standards it meets. Students need no account, and a free class saves their work.
Reaction Lab: Where Did the Atoms Go?
Students put hydrogen and oxygen in a sealed flask on a scale and press React before balancing anything: an oxygen atom vanishes and the scale drops, which cannot happen. They fix the equation by adding whole molecules, follow one atom through the reaction, and then balance burning methane on their own.
FreeReaction Lab: The Equation That Lies
An unbalanced equation is a claim that atoms were made or destroyed. Students run burning methane unbalanced on purpose and read what it claims, balance it with whole molecules, then work three puzzles: the missing molecule, the picture that cannot be right, and an equation with the same total of atoms on each side that is still not balanced.
FreeReaction Lab: Lid On, Lid Off
Students run the zip bag lab on the app's kitchen scale: sealed, the reading holds; in an open cup it drops. A magnifier shows the particles. Then they switch to the particle view, take the lid off, and watch the carbon dioxide molecules leave the flask and the scale drop by exactly their mass. If your class can run the real bag lab, run it alongside.
FreeReaction Lab: Does Burning Destroy Matter?
Steel wool on a scale gets heavier when it burns, and a candle gets lighter. Students run both on the app's lab bench with a magnifier over them, find where the oxygen comes from and where the carbon dioxide and water go, then write back to a classmate whose lab notes say the scale must be broken.