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

Answer 1

B. Cornstarch

Step-by-step explanation:

Iodine reacts with some substances and changes color as a result of the reaction. Out of the items listed:

B. Cornstarch will react with iodine and produce a blue-black color. This reaction is due to the presence of starch, which reacts with iodine to form a complex molecule called iodine starch.

A. Baking soda, also known as sodium bicarbonate, does not react with iodine and will not cause a color change.

C. Salt, also known as sodium chloride, does not react with iodine and will not cause a color change.

D. Powdered sugar, also known as sucrose, does not react with iodine and will not cause a color change.