Question

Burning toast is chemical change or physical change? Give reason.

Answer 1

Explanation:

Precisely because it is burning and that is a chemical reaction. In reality when we make toast we carbonize or partly carbonize the starch molecules in the bread. Water is driven off and the starches decompose to sugars which then caramelize, turning them brown.

Answer 2

Burning toast is a chemical change because of the following reason:

• Chemical change, as we know, entails the breaking and/or reformation of chemical bonds, resulting in the development of a molecule that differs from the previous one.
• When toast is burned, it is exposed to high temperatures, causing the starch held within it to convert to sugar.
• The change is seen in the colour of the bread, which turns brownish and has a different smell than before.
• Because of a chemical change in the bread molecules, these features are observed. It cannot be returned to its original state.
• Hence, it is a chemical transformation example.