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

Chapter 17

Free Energy and Thremodynamics

QuestionAnswer
There is a 'heat tax' for every energy transaction
The _______________ Law of Thermodynamics sates the energy is conserved in chemical processes. First
Identify the process that is spontaneous. rusting of iron
__________________ is a thermodynamic function that increases w/ the number of energetically equivalent ways to arrange components of a system to achieve a particular state. Entropy
The ________________ Law of Thermodynamics states that for any spontaneous reaction, the entropy of the universe increase. Second
Which of the following processes have a Δs>0? CH4(g) + H2O(g) --> Co(g) + 3 H(g)
Endothermic processes decrease the entropy of the surroundings, at constant T and P.
What is the sign of ΔSuniv for a biological system? positive
Which of the following relationships is correct at constant T and P? ΔG is proportional to -ΔSuniv
Consider a reaction that has a positive ΔH and a positive ΔS. This reaction will be spontaneous only at high temps and nonspontaneous at low temps
Consider a reaction that has a negative ΔH and a positive ΔS. This reaction will be spontaneous at all temps
Consider a reaction that has a positive ΔH and a negative ΔS. This reaction will be nonspontaneous at all temps
Consider a reaction that has a negative ΔH and a negative ΔS This reaction will be nonspontaneous only at high temps This reaction will be spontaneous at low temp
2 N2O(g) --> 2 N2(g) + O2(g) a negative ΔH and a positive ΔS
3O2 --> 2O3(g) a positive ΔH and a negative ΔS
H2O --> H2O(g) a positive ΔH and a positive ΔS
H2O --> H2O(s) H2)(I) --> H2O(s) a negative ΔH and a negative ΔS
The _______________ Law of thermodynamics states the entropy of a perfect crystal at absolute zero is is zero. Third
For a given compound, list the decreasing order of entropy for a liquid. solid. and gas. gas>liquid>solid
Entropy is an extensive property
Free atoms have greater entropy than molecules
What can change the direction of a reversible reaction? change in temp, pressure, volume
Give the name of the reaction that achieves the theoretical limits with respect to free energy in thermodynamics reversible reaction
If ΔGrxn>0 the reaction is spontaneous in the forward direction
ΔGrxn=0 at equilibrium
ΔGrxn is positive and the reaction is spontaneous in the reverse direction
ΔGrxn is negative and the reaction is spontaneous in the forward direction
ΔGrxn is zero and the reaction is at equilibrium
Which of the following reactions will have the largest equilibrium constant (K) at 298K? 2 Hg(g) + O2(g) --> 2HgO(s) ΔG=-180.8 kJ
In which of the following processes does the molecules become more orderly? Identify the change in state that does not have an increase in entropy. water freezing
Which of the following processes have a ΔS>0? potassium iodide dissolves in pure water
Which of the following processes have a ΔS<0? water freezes, methyl alcohol condenses, propanol (g, at 555 K) --> propanol (g, at 400 K) CO2 (g) --> CO2 (s)
Which of the following processes shows a decrease in entropy of the system? 2 NO (g) + O2 (g) --> 2 NO2 (g)
Which one of the following has the highest standard molar entropy, S, at 25C? I2 (g)
Identify the compound that is NOT an allotrope of carbon. ethanol
Which one of the following would be expected to have the lowest standard molar entropy, S an 25C? C10H22 (s)
Identify the compound w/ the lowest standard free energy of formation NaCl (s)
Identify the compound w/ the highest standard free energy of formation O3 (g)
Identify the compound w/ the standard free energy of formation equal to zero. H2 (g)
Q=K Equilibrium
Q<K DG<0
Q>K ΔG>0
Q=1 Standard state
Q>1 ΔG>ΔG
Q<1 ΔG<ΔG
Created by: karmabites
 

 



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