Test pairs of ingredients for making bread, to find out which ones make gas, which causes dough to rise.
Science content (2016 curriculum):
Biology: Features, Adaptations of Living Things (K, 1, 3, 7)
Chemistry: States of Matter, Properties of Materials (K-7)
Chemistry: Chemical Changes (2, 7)
Science topic (2005 curriculum connection):
Life Science: Plant Growth and Changes (grade 3)
Physical Science: Chemistry (grade 7)