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In this activity, learners make a black box device that serves as an excellent analogy to Rutherford's famous experiment in which he deduced the existence of the atomic nucleus.

Electrolysis is the breakdown of water into hydrogen and oxygen. This Exploratorium activity allows learners to visualize the process with an acid-based indicator.

In this activity, learners make different shapes that hold exactly one mole of gas (air).

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.