Energy

[Arman M 1A]

Why is energy of an isolated system always constant at equilibrium?

[Kate Chow 4H]

Energy is always constant in an isolated system at equilibrium based on the principle of conservation of energy and the fact that in an isolated system, energy cannot be exchanged.

[004932366]

I am not sure by what you mean by the energy of an isolated system being constant at equilibrium specifically, but the definition of an isolated system is a system that cannot exchange either matter or energy with its surroundings. There can be energy transformations within an isolated system, but there is not change in the total energy level. Because there is no change in the total energy level of an isolated system, we say that energy in an isolated system is conserved. This energy conservations is stated in the first law of thermodynamics.

[Charles Gu 1D]

An isolated system does not allow matter or energy to be exchanged so it will be at equilibrium.

[Abby-Hile-1F]

Since neither energy nor matter can be exchanged in an isolated system, the energy cannot change and will remain constant.

[Aiden Atoori 1C]

A reaction has reached equilibrium when the reaction has stopped progressing, so that the amount of reactants that have turned into products remains constant, and the amount of reactants left over stays constant. The equilibrium constant is the ratio of products to reactants when the reaction has reached equilibrium.