Frying an egg physical or chemical change?

Answer 1

There are both physical and chemical changes happening in both frying eggs or baking a cake. These are not simple reactions, many complex events happen inside these foods during cooking.

A few examples:

• polymerizations and crosslinkings are happening in the eggs - chemical change
• proteins and sugars combine causing browning of the cake - chemical change
• baking soda or baking powder in the cake gives off carbon dioxide - chemical change
• carbon dioxide forms bubbles causing the cake to rise - physical change
• water is evaporating from both the eggs and the cake - physical change
• etc.

Answer 2

Frying an egg is a chemical change because the protein in the egg white becomes denatured as it turns white and solid, which is not reversible by physical means.

Answer 3

Chemical.