Question

1. you slice a loaf of bread into thin pieces. later, one slice is toasted in the toaster until it browns and hardens. what clues show that the toasting of the bread involves a chemical change?

Explanation:

A chemical change results in a new substance being formed. When bread is toasted and turns brown, new compounds are created due to the Maillard reaction between amino - acids and reducing sugars in the bread. This is not just a physical change like cutting the bread into slices. The browning and development of a different flavor and texture are indications of new substances being formed.

Answer:

The browning of the bread and the development of a different flavor and texture are clues that the toasting involves a chemical change.