Classroom mode
Run it in class
Why does red cabbage juice turn pink in lemon and green in soap?
Show of hands — before you project anything
Why can a color change be evidence about an otherwise clear liquid?
- A Way more than you'd guess
- B About what you'd guess
- C Way less than you'd guess
Count the votes out loud. Hold them to it — then watch.
Project it (fullscreen)
Discussion prompts
- Why can a color change be evidence about an otherwise clear liquid?
- What does the unchanged purple control cup add to the experiment?
- Why is cabbage indicator useful for broad comparisons but weaker than calibrated pH paper for an exact measurement?
Where it shows up in real life
- pH test strips used for swimming pools and aquariums
- universal indicator solution in a science classroom
- plant pigments whose appearance depends on their chemical surroundings
A prediction-first worksheet — no answer key.
zero prep · no login · any projector
Winding down at home? Family mode ·
Explore every question
Why does red cabbage juice turn pink in lemon and green in soap?
Predict — what do you think will happen, and why?
Talk about it
- Why can a color change be evidence about an otherwise clear liquid?
- What does the unchanged purple control cup add to the experiment?
- Why is cabbage indicator useful for broad comparisons but weaker than calibrated pH paper for an exact measurement?