Question

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.

How many chemical changes occurred in this scenario?

Answer 1

one

Step-by-step explanation:

The chemical change that occurred was the toasting of the bread. This caused the bread to be heated and cooked, using fire to change it into a new substance. This cannot be reversed because you cannot make toast back into bread. All of the other changes were physical changes and did not change the identity of the substance.

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Hope this helps!

Answer 2

One chemical change occurs.

Step-by-step explanation:

Changes in state does not necessarily mean a chemical change has taken place. For example, dissolving salt in water is classified as a chemical change because the ions are dissolving into the water, however dissolving glucose in water is not a chemical change because the entire molecule is polar, and no chemical change takes place.

Applying heat to bread to make toast is a chemical change. Cutting an apple is not a chemical change. Mixing lemonade powder into water is not a chemical change because it is the powder does not under go a change chemically.