Enthalpy vs Entropy

[JaylinWangDis1L]

This might be a dumb question but I just realized I don't actually know the difference between enthalpy and entropy. Can someone explain it to me :')

[Isabelle Hales 1J]

Hi! Enthalpy describes the amount of heat released or absorbed at a constant pressure. Entropy, on the other hand, is a measure of the likelihood that the system will be in a particular state. If there are more possible states for the system to be in, the entropy increases. (In high school, I remember hearing that entropy is equivalent to disorder if that is helpful). Also, it is important to keep in mind that enthalpy is a state property while entropy is an extensive property (depends on the number of particles). Hope this helps!

[805295074]

Another helpful idea I learned is that entropy is "the chaos in the universe" and we do work (exerting energy) to put it back in order.

[Kayle Lim 2C]

The straightforward definition of both would be

Enthalpy: the amount of heat gained or released by a system (denoted by H)
Entropy: the amount of disorder or randomness in a system (denoted by S)

Both enthalpy and entropy contribute to the Gibbs free energy equation! Units for enthalpy are usually kilojoules per mole and units for entropy are usually joules per Kelvin.

https://www.youtube.com/watch?v=E5m5H9F ... orRestrepo
^^ I found this video to be really helpful to understanding what "chaos" and "randomness" actually mean as the video compares the differences of enthalpy and entropy by describing water in its form of ice and liquid. I hope this helps !

[Morgan Gee 3B]

Enthalpy is represented by H and is heat. Heat is defined as energy either entering or leaving a system. When an object cools down, that object is losing energy in the form of heat, meaning that enthalpy is negative. Entropy is represented by S and can be called disorder. This has to do with degeneracy and microstates as they can be used to calculate S. Some examples of increasing entropy would be increasing temperature or producing more moles of gas in a chemical reaction.

[Ivy Tan 1E]

Hi!
Enthalpy (represented by the variable H) is the heat released or absorbed by a system under constant pressure. Entropy (represented by the variable S) is the measure of molecular disorder or randomness in a system. Hope this helps!!

[Moura Girgis 1F]

A difference between the two is that enthalpy tends to be negative, as there is a change in heat, while entropy tends to be positive, as there is a change in disorder.

[Jalaia Jackson 2G]

This isn't a dumb question at all. Enthalpy has to deal with heat, while entropy has to do with the state of a system. In more depth, enthalpy is the heat content of a system, and enthalpy changes when energy is either lost or gained. Entropy refers to the level of disorder of a system depending on the state it is in like gas, liquid, and solid.

[Astha Sahoo 3I]

Enthalphy is the difference in heat, while entropy is the difference in disorder. Usually, spontaneous reactions involve the increase of entropy since the universe wants to always increase entropy.

[Chloe Shamtob 2H]

Enthalpy, which is denoted by H, is used to describe the amount of heat released or absorbed at a constant pressure. Entropy, which is denoted by S, is used to measure of the likelihood that the system will be in a particular state and the disorder of the particles. The more possible states a system can have the higher the entropy.

[Edwin Liang 1I]

Entropy is the amount of disorder in a system. Enthalpy is the amount of heat released or absorbed in a given system. Temperature and phase changes affect entropy and enthalpy.

[jasmineculilap_3F]

Entropy is disorder while enthalpy is heat. Enthalpy is the heat absorbed/released in a system while entropy is the measure of disorder.

[Riddhi Mehta 2C]

Entropy is the measure of disorder or level of chaos in a system whereas enthalpy is the energy in the system.

[Sara Sandri 2B]

Enthalpy is a measure of the heat of a reaction, whether that heat is absorbed (positive enthalpy) or whether that heat is released (negative enthalpy). Entropy is a measure of disorder in a reaction.

[DominicMalilay 1F]

Enthalpy is also known as heat, while entropy is the chaos or the disorder of molecules.

[Michelle Nguyen 3F]

Hello! Enthalpy is the measure of total heat present in the thermodynamic system where the pressure is constant. Entropy is the measure of disorder in a thermodynamic system.

[Can Yilgor 2D]

Here are the definitions of enthalpy and entropy that I have in my notes:

Enthalpy: the amount of heat released or absorbed at constant pressure (state property)
Entropy: the number of accessible states/positions that can be occupied (extensive property)

[Liam Bertrand 3]

Enthalpy involves heat released, while entropy is the number of states a system can be in.

[Kayla Booker 1F]

Enthalpy is the change in heat while entropy is the change in chaos, or disorder

[Edgar Velazquez 2K]

Enthalpy is more so the change in heat (loss/gain) of the system while entropy is more like the change in order/disorder of the system.

[John_Tran_3J]

Enthalpy is referred to the amount of energy released (heat released) and entropy refers to the amount of disorder in the world (refers to the second law of thermodynamics,)

[Isabella Cortes 2H]

HI! Enthalpy is the amount of the heat that is released and entropy is the amount of disorder in a system.

[Cristian Cortes 1L]

Enthalpy = H = Heat in system , given or taken
Entropy = S = System disorder (change from order to disorder, vise versa)

This has been the simplest form I have put it all quarter. Hope it helps. still gets confusing at times.

[Diana Aguilar 3H]

Hi! Enthalpy focuses on the change of heat in a system, while entropy focuses on the change in disorder of a system

[Madison Wong 3H]

Enthalpy refers to the transferrals of heat, while entropy relates to the disorder (whether thermal or positional) of a system. While these two are related, they are different concepts!

[Jeremy Wei 2C]

Enthalpy refers to the heat released/absorbed in the system, while Entropy refers to the disorder of the system.

[Lorena_Morales_1K]

No such thing as a dumb question :)
Enthalpy is the amount of internal energy contained in a compound whereas entropy is the amount of intrinsic disorder within the compound. Enthalpy is zero for elemental compounds such hydrogen gas and oxygen gas; therefore, enthalpy is nonzero for water (regardless of phase).

[Sara Sandri 2B]

Enthalpy refers to the heat absorbed whereas entropy refers to disorder. Both are state functions.

[Sofia Lombardo 2C]

Entropy refers to the disorder or microstates. Enthalpy refers to the heat exchange (absorbed or released). Both entropy and enthalpy are state functions.

[Gicelle Rubin 1E]

Basically:
Enthalpy would be the the amount of heat released/gained
Entropy would be the disorder :)

[Jarrett Sung 3B]

Enthalpy is more about heat transferred, while entropy is about disorder and the number of possible positions for atoms/molecules. It's important to note that they're both state functions.

[Phoebe Joseph]

Yes, as other people have answered: enthalpy(H) is a measure of heat transfer while entropy(S) is a measure of disorder. If you say enthalpy increases (delta H is positive) then the system is using heat and needs an external supply of heat to process - this is non-spontaneous and endothermic. A negative delta H indicates that the system is releasing thermal energy - this is spontaneous and exothermic. If a system is increasing in entropy (delta S is positive) then the system is increasing in disorder - which is spontaneous. A good example of this that I learned in LS7A was using your room as an examples of increasing entropy. Naturally, your room will become more disordered (increase in entropy) as time elapses unless you put in work to stop and/or reverse this. That is how I remember what entropy is and why a positive change in entropy is spontaneous!

Hope this helps!

[605823283]

Enthalpy is the total heat of a system while entropy is the disorder and randomness of a system

[Michelle Argueta 1E]

Enthalpy is the amount of heat gained or released by a system.
Entropy is the amount of disorder in a system that releases energy to be used and put to work to bring back order.

[Reece Fong 2k]

Basically, enthalpy has to do with heat and entropy has to do with chaos, or disorder.

[305670352]

By definition:

Enthalpy: the amount of heat gained or released by a system (denoted by H)
Entropy: the amount of disorder or randomness in a system (denoted by S)

[Sabira Mohammed 3I]

Enthalpy has to do with the net release or absorption of heat, and entropy is how much disorder is in a system

[Nishan Reddy 3K]

Enthalpy and entropy are essential aspects for the overall energy in a system. Enthalpy is simply the change of heat energy in the system whether energy is being added or taken out of the system. Enthalpy is a system's tendency towards disorder which means that some amount of heat energy must be used to maintain the system which plays into the total energy of the system. These are also intercorrelated with the spontaneity of a chemical reaction which is expressed through Gibb's free energy.

[605499821]

Enthalpy: the amount of heat energy added or released by a system
Entropy: the amount of randomness or disorder within a system

[danielle05]

Enthalpy is the sum of heat released or absorbed during a chemical reaction, while entropy is how disordered a system is. Enthalpy is denoted by the symbol H while entropy is denoted by the symbol S.