A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?

Question

A chemistry class is experimenting with iodine to see which common white powder items will react and make the iodine change color. Which item listed will have a chemical reaction with iodine?
A. baking soda
B. cornstarch
C. salt
D. powdered sugar

GPT-4o mini · Answer

B. cornstarch

Iodine reacts with starch to produce a blue-black color, indicating a chemical reaction. The other items listed—baking soda, salt, and powdered sugar—do not cause a color change when mixed with iodine.