Change flower petal colours with acid/base and use red cabbage as an acid/base indicator.
Science content (2016 curriculum):
Biology: Features, Adaptations of Living Things (K, 1, 3, 7)
Chemistry: Atoms, Molecules (3-7)
Chemistry: Chemical Changes (2, 7)
Curriculum connection (2005 science topic):
Life Science: Plant Growth and Changes (grade 3)
Physical Science: Chemistry (grade 7)