Sugar-Water Rainbow in a Straw

Colored layers stack. Ask students to predict what will happen. Layer different sugar concentrations in straw/tube. Key idea: More dissolved sugar makes a denser solution. Ask: Which color has the most dissolved sugar? Safety and cleanup: No tasting; label solutions. https://www.google.com/search?q=%22Sugar-Water+Rainbow+in+a+Straw%22+science+demonstration+experiment