Justin is making a snack. He toasts a piece of bread and spreads peanut butter and jelly on it. Then he cuts an apple into several slices and adds these to his plate. Next, Justin mixes a scoop of lemonade powder into a glass of water, mixes it, and adds ice.

Question

How many chemical changes occurred in this scenario?

one
two
three
four

Answer 1

In the scenario described, there are several processes occurring, but we need to identify which of them involve chemical changes.

1. Toasting the bread involves a Maillard reaction and the changes to the composition of the bread when it is heated, which is a chemical change.
2. Spreading peanut butter and jelly on the bread does not involve a chemical change; it is a physical change as the substances retain their properties and do not alter chemically.
3. Cutting an apple does not change its chemical structure; it's a physical change.
4. Mixing lemonade powder into water and adding ice also primarily involves dissolving the powder (a physical change), although if there is any chemical reaction occurring, it’s minimal. But typically, this is not classified as a significant chemical change.

From this analysis, there is one chemical change (toasting the bread). Therefore, the answer is one.