Is boiling an egg a chemical change?

Answer 1

Boiling an egg is and is not a chemical change, depending on how you are chemically defining the egg.

Some chemicals inside the egg will undergo various chemical reactions, driven by the heat of the boiling. These reactions will involve the formation of new chemicals with new empirical formulas and the destruction of old ones.

Other chemicals, particularly proteins, will undergo changes in their conformation or secondary and tertiary structures. While their empirical formulas will remain unchanged (or largely unchanged), the new structures may have different chemical properties than the old ones.

The only way in which the egg does not undergo a chemical change is if you are referring to the empirical formula of the egg as a whole. No atoms leave or enter the egg, so the atomic composition of the egg remains unchanged.

Answer 2

No. Water boiling, is a physical change and not a chemical change because the simplest way to put it is that physical change is something you can reverse such as melting or freezing of ice, where as chemical change is not reversible. But you can reverse the evaporation which eventually becomes water again (rain). So water boiling is in fact a physical change.

Answer 3

Even though it may appear so, boiling water does not involve a chemical change. It is merely changing the state of the substance.

Answer 4

It is off course a physical change. Because you change its state of matter.

Answer 5

no it is a physical change, because if you cool it you still have what you started with.

Answer 6

No. Boiling is a physical change.

Answer 7

No, when boiling water is to make steam it is physical because it still has water molecules, and you can get it back into water droplets if it is cool (cold) enough.