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?

baking soda

powdered sugar

salt

cornstarch

1) corn starch

2) the indicator will change the color of the substance
3) it will bubble and foam
4) the test was inconclusive because the student forgot to add heat

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To determine which item will have a chemical reaction with iodine, we need to consider the properties of each substance and whether they are likely to react with iodine.

Let's start with baking soda (sodium bicarbonate). Baking soda is a mild alkaline substance, which means it can react with acids. However, it doesn't typically react with iodine. Therefore, it is unlikely to cause a color change in iodine.

Next is powdered sugar (sucrose), which is a type of carbohydrate. Sucrose is not known to react chemically with iodine, so it is also unlikely to cause a color change.

Salt (sodium chloride) is a common compound that is made up of sodium and chlorine ions. Like baking soda and powdered sugar, salt does not typically react with iodine to produce a color change.

Lastly, we have cornstarch. This item is a complex carbohydrate and is unlikely to undergo a chemical reaction with iodine.

Based on the properties of the substances, none of the listed items—baking soda, powdered sugar, salt, or cornstarch—are expected to have a chemical reaction with iodine to cause a color change.