All of the statements concerning free energy and spontaneity are ...

[yoooooman]

All of the statements concerning free energy and spontaneity are true except
 
  A) if the value of G for a reaction is 55.2 kcal, the value of G for the reverse reaction will be -55.2 kcal.
  B) if the value of G for a reaction is negative, the reaction is said to be spontaneous.
  C) a reaction which is nonspontaneous at low temperature cannot be spontaneous at higher temperatures.
  D) enthalpy and entropy are of equal importance in determining the spontaneity of a reaction.
  E) the speed of a reaction is not influenced by its spontaneity.

Question 2

Consider the endothermic reaction: N2 (g) + 2 H2 (g)  N2H4 (l) The entropy change of this reaction is ________ and the enthalpy change is ________, so at a very high temperature, this reaction is probably ________.
 
  A) favorable; unfavorable; nonspontaneous
  B) favorable; unfavorable; spontaneous
  C) unfavorable; unfavorable; spontaneous
  D) unfavorable; unfavorable; nonspontaneous
  E) unfavorable; favorable; spontaneous

Question 3

2 Al2O3 (s)  4 Al (s) + 3 O2 (g) G = +138 kcal
 
  Consider the contribution of entropy to the spontaneity of this reaction. As written, the reaction is ________, and the entropy of the system ________.
  A) spontaneous; increases
  B) spontaneous; decreases
  C) non-spontaneous; increases
  D) non-spontaneous; decreases
  E) non-spontaneous; does not change

Question 4

All of the statements are true for spontaneous reactions except
 
  A) the value of G is less than zero.
  B) the value of G is unaffected by a catalyst.
  C) they are said to be exergonic.
  D) if the enthalpy change is unfavorable, they occur at a high temperature.
  E) the reaction rate is determined by the value of G.

[wtf444]

Answer to Question 1

D

Answer to Question 2

D

Answer to Question 3

C

Answer to Question 4

E

[yoooooman]

TYSM

[marict]

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