Is Cooking an Egg a Chemical Change or Physical Change? [Answered!]

A chemical reaction happens while cooking. It refers to the process where the cooked material will not return to its previous state.

The substance that undergoes change chemically will lose its previous identity due to the transfer of heat.

The heat results in some changes to the original material and aids in the breakdown of bonds in the particles.

Since a cooked egg cannot be returned to its uncooked condition, the chemical change also cannot be reversed. So, whenever you’re trying to classify a material under physical or chemical change, ask yourself – Can I make it change back to raw egg *or other material or food? If not, then it’s a chemical change.

So, cooking an egg is considered a chemical change, not a physical change.

However, there is an exception to this rule – If you separate the egg yolk from the white first, then it’s physical. Think about it.

Why Is Cooking an Egg Irreversible?

Cooking an egg is irreversible because chemical bonds are broken and new ones are created, triggering the formation of new substances.

Yes! A lot of the bonds broken are what result in the egg’s proteins folding up into a globular shape.

The protein chains unfold and become entangled leading to the set effect. This is popularly referred to as denaturing.

Whether or not a change can be reversed has no bearing on whether it is chemical or physical.

The process of cooking an egg and reversing the process is almost impossible because of entropy effects but that simply isn’t true of all chemical reactions, and there are lots of physical changes which are hard to reverse.

Chemistry Of Cooking An Egg

The heat from the pot causes the egg’s protein to change permanently in appearance and texture via a process known as denaturing.

The egg liquid turns solid, and the “egg white” goes from being basically clear to becoming literally white.

Browning may also take place.

Is Frying An Egg Chemical Or Physical Change?

A chemical change results in the formation of new substances, and the changes that occur cannot be reversed (at least without other chemical changes). Frying an egg requires heat and the heat causes the egg’s protein to become solid, and the “white” of the egg goes from being basically clear to being literally white.

If left longer than it should, a frying egg will turn brown, then black. These are indicators of a chemical change.

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Chemical Equation of Frying an Egg

Sodium;oxypropyl] hydrogen phosphate


PubChem CID:

Molecular Formula: C37H7oNa0gP
Chemical Names: 169437-35-8 16:0-

18:1 PA Egg PA

POPA L-alpha-Phosphatidic Acid

(Egg,Chicken-Sodium Salt)

Molecular Weight: 696.9 g/mol
Dates: 07 Create: 2008-02-05


Modify: 2019-09-07

Is Cooking an Egg an Example Of A Physical Or Chemical Change, Explain Your Answer

Cooking an egg is an example of a chemical change because:

  • If it was the breaking of the egg that would be a Physical change, as everything about the egg would be the same (proteins, yolk).
  • The liquid component of the egg changes from liquid to solid and that is a chemical transition.
  • The chemical change that occurs is irreversible in nature.
  • The egg white or yolk proteins are heated at high temperatures, and they convert to other proteins, so cooking the egg is a chemical change.
  • Lastly, you cannot get back the raw egg from the cooked egg.

Is Cooking an Egg a Chemical Change

Physical Change Of An Egg

Breaking or cracking an egg is a physical change because when we break an egg, only the shape and position change, the components and the chemical of the egg still remain the same. We aren’t turning the egg chemicals into new chemicals. Since no new chemicals are produced, it is a physical change.

Is Cracking An Egg A Physical Or Chemical Change?

Cracking an egg is an example of irreversible physical change since the egg and the stuff inside do not change but the appearance or shape of the shell changes.

When no new chemicals are produced, it is a physical change.

Why is Cracking An Egg A Chemical Change?

The cracking of an egg is a physical change since the egg’s YOLK and WHITE f inside do not change but the shape or appearance of the shell changes. When no new chemicals are produced, it is a physical change.

Is Scrambling Eggs a Chemical Change?

 Scrambling egg first undergoes physical change – the egg is first cracked, and then whisked together.

Then a chemical change – heat is applied to the egg, and it changes from a liquid to a solid state.

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