Laws of Thermodynamics

[narek kurkjian 2I]

Can somebody please explain and simplify the Three Laws of Thermodynamics?

[Harry Forbeck 2A]

The 1st Law basically says the energy cannot be created nor destroyed in a system. Specifically, is says that in an isolated system, the amount of energy will not change
The 2nd law is one to do with entropy - in the textbook, "The entropy of an isolated system increases in the course of any spontaneous change." Basically, if a reaction needs no energy input, the entropy will increase.
the 3rd law is what we went over in the last lecture. the textbook says "The entropies of all perfect crystals approach zero as the absolute temperature approaches zero." which essentially means that when temp = 0, there is no entropy/disorder in the system.

[Ishika Gupta 3E]

The 1st law says that energy cannot be created or destroyed. The 2nd law says that the total entropy of the system and its surroundings has to increase with spontaneous reactions. The 3rd law says that the entropy of a pure crystalline structure at T = 0 K is 0, meaning there is no disorder.

[Kelly Tang 1B]

Hello! The first law of thermodynamics deals with the conservation of energy, which means that energy cannot be created nor destroyed. We work with ΔU = q + w in this case. The second law basically states that total entropy (system + surroundings) increases with spontaneous reactions. This means that as energy continuously transforms, disorder increases because there will always be energy that is lost as unusable. The third law states that the entropy of a perfect crystal at absolute zero temperature is 0. This is because there is no movement at 0K, so there is no disorder/entropy.

[Saba Honarvar 3A]

Hi!
The first law is Delta U = Q - W and is basically the law of how energy cannot be created or destroyed and the conservation of energy.
The second law is stating that the state of entropy of the entire universe, as an isolated system, will always increase over time. In other words, if a reaction needs no energy to be inputted the entropy will increase. It also states that changes in the entropy can never be negative.
The third law is stating that the entropy of a system approaches a constant value as the temperature approaches absolute zero. So this would mean that if the temperature where to be 0, there is no entropy and disorder.
Hope this helps!

[Shiraz Becker 2A]

Here is the simplified way I remember the laws of thermodynamics:
1st Law: energy cannot be created or destroyed (deltaU = q + w)
2nd Law: in any spontaneous process there is an increase in entropy in the universe
3rd Law: a perfect crystal has zero entropy at zero kelvin