Save
Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know
Remaining cards (0)
Know
0:00
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Thermodynamics II

Entropy/Free Energy

QuestionAnswer
First Law of Thermodynamics the energy of the universe is constant
Second Law of Thermodynamics the universe tends toward disorder; the entropy of the universe is increasing
Third Law of Thermodynamics the entropy of a perfect crystal at 0 K is 0; a perfect crystal represents the lowest possible entropy because it has a highly regular structure = only ONE possible configuration
How does temperature affect entropy? as the temperature increases, so does entropy (increasing temp increases the random motions/disorder)
When will an increase in temp/energy have a greater impact? increase in temp/energy has a greater impact on something that started with a lower energy
What affect does pressure have on entropy? as pressure increases, entropy decreases. higher pressure = higher entropy
What point will a reaction usually stop at? equilibrium, because it is the lowest possible free energy point
What is Wmax? Wmax = G; maximum possible useful work obtainable from a process at constant temp/pressure; equal to the change in free energy
What is deltaG? the amount of free energy available to do useful work; deltaG = deltaH - TdeltaS
What is "wasted" energy? energy that is used doing something other than work, such as used in frictional heating
Reversible Process process that can be performed forward and in reverse, and end up w/ the universe exactly the same as it was before the process began; can only occur hypothetically
Irreversible Process universe is different after cyclic process is performed; system returns to its original state, but surrounds has to furnish a net amount of work; all real processes are irreversible
How does the energy crisis relate to entropy? when gas+O2 combust, the energy in bonds spreads over the surroundings as thermal energy instead of being concentrated; the thermal energy is harder to use. the energy has become more disordered (increase in entropy) and less useful (energy crisis)
deltaS of surroundings deltaS of surroundings = -deltaH / T in K
Spontaneous Process occurs without outside intervention
Positional Probability depends on the number of positional microstates (spatial configurations) that yield a specific state
deltaS of universe deltaS of universe = deltaS of system + deltaS of surroundings; deltaS universe = -deltaG / T in K
Created by: nickyvee
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards