All of the following are correct except: A) Only spontaneous processes occur nat

Question

All of the following are correct except: A) Only spontaneous processes occur naturally. B) A spontaneous process is process that occurs in a system left to itself. C) The greater the degree of randomness in a system, the greater the entropy. D) A nonspontaneous process will not occur unless some external force is applied. (E) If a reaction is spontaneous, the reverse is also spontaneous. All of the following are correct except: A) Gases have less entropy than their solids. B) Solutions have more entropy than the solids dissolved. C) Entropy of a substance increases as its temperature increases. D) Liquids have more entropy than their solids. E) Gases have more entropy than their liquids. For the reaction: Mg (s) + AgNO_3 (aq) rightarrow Ag (s) + Mg (NO_3) 2 (aq) Ag^+ (aq) + e^- rightarrow Ag (s) E degree = 0.800 V Mg^2+ (aq) + 2 e^- rightarrow Mg (s) E degree = -2.356 V Is the reaction spontaneous and why? A) no, E degree is a positive value B) no, Mg (s) docs not react with Ag^+ C) yes, E degree is a negative value D) yes, E degree is a positive value E) no, E degree is a negative value Choose the correct statements concerning entropy. I) As two gasses mix, Delta S is positive. II) Entropy is a thermodynamic property related to the degree of disorder. III) A temperature in a gas decreases, Delta S is positive. A) I and II B) II and III C) I, II, III D) I and III E) I, II, IV Choose the INCORRECT statement. A) When a half reaction is reversed, the sign of the potential is changed. B) Reversing a half reaction males it a reduction potential. C) A voltaic cell is called a battery. D) Each cell has a reduction half cell and an oxidation half cell. E) The potential difference of a cell is the voltage of the cell.

Explanation / Answer

12>option E correct

if a reaction is spontaneous in forward direction than is it is non spontaneous in backward direction

13>option A

gases are more random than solid so they have more entropy

14>reaction is spontaneous

E CELL is positive

15>A

as two gases are mixed than each gases get more volume to move so overall randomness increases

more is disorder more is entropy

entropy is measure of randomness

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