ACT Preparation / Unit 20 ACT 1923 short lesson, about 20 seconds
Comparing Experiments
Captions available
The idea
When a passage gives several experiments, the difference between them is often one change in procedure. Identifying that change explains why their results differ.
In practice
Experiment 2 repeats experiment 1 with salt water instead of fresh, so any change in results traces to the salt.
Where people slip
Read each new experiment's description for the one thing that is new.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
Something wrong in this lesson? Flag it · Sources for ACT Preparation