This is a simulation, not a quiz. You answer by trying things and watching what happens.
Our question
What controlled comparison will help you distinguish an observable material change from a change in position or arrangement?
Getting the simulation ready…
1Change one thing
2Say what will happen, then run it
3Finish: say what you found
What counts as evidence
Select the measured comparison that directly addresses the prediction.
Name the changed condition, cite one result, and connect it to this goal: Distinguish an observable material change from a change in position or arrangement.
Your controlled comparison, measured result, revised model, and transfer claim become inspectable scientific evidence.
First Reaction: predicted what should change before this action: Add H₂ molecules to the flask.