Which of the following about a reaction is not considered in the field of thermo

Question

Which of the following about a reaction is not considered in the field of
thermodynamics?
a. direction b. rate c. extent d. energy e. equilibria
2. Most spontaneous reactions are but all require that there be an
in entropy.

a. endothermic, decrease b. exothermic, decrease c. endothermic, increase
d. endothermic, increase e. either exo or endothermic, no change
3. A reaction that is spontaneous as written …
a. is very rapid b. will proceed without outside intervention c. is also
spontaneous in the reverse reaction d. has an equilibrium position that lies far to the
left e. is very slow
4. When a system is at equilibrium, …
a. the reverse process is spontaneous but the forward process is not.
b. both the forward and the reverse processes are spontaneous
c. the forward proves is spontaneous but the reverse process is not
d. the process is not spontaneous in either direction.
e. both forward and reverse processes have stopped.
5. A reversible process is one that …
a. can be reversed with no net change in either system or surroundings
b. happens spontaneously c. is spontaneous in both directions
d. must be carried out at low temperature e. must be carried out at high
temperature
6. Which of the following is always positive for a spontaneous process?
a. S sys b. S surr c. S universe d. H universe e. H surr
7. S would be positive for which of the following reactions?
a. 2H 2(g) + O 2(g) 2 H 2 O (g) b. 2NO 2(g) N 2 O 4(g) c. CO 2(g) CO 2(s)
d. BaF 2(s) Ba +2 (aq) + 2F -1 (aq) e. 2Hg (l) + O 2(g) 2HgO (s)
8. A pure crystalline solid is heated from absolute zero to a temperature above
the boiling point of the liquid. Which of the following processes produces the greatest
increase in the entropy of the substance?
a. melting the solid b. heating the liquid c. heating the gas d. heating the solid
e. vaporizing the liquid

9. Of the following, the entropy of which gas is the largest at 25 0 C and 1 atm?
a. H 2 b. C 2 H 6 c. C 2 H 2 d. CH 4 e. C 2 H 4
10. Using the data from the tables at the end of your textbook, calculate the S 0
for the reaction shown:

C 2 H 4(g) + H 2(g) C 2 H 6(g)

a. -101.9 b. -120.5 c. -232.5 d. +112.0 e. +101.9
11. What can be said about a chemical system that has reached a minimum in
free energy?
a. The temperature is correct b. the system entropy is zero. c. The system has
achieved equilibrium d. The reaction is complete e. The reaction is very fast
12. The standard Gibbs free energy of formation of which of the following is
zero?

A. H 2 O (l) B. O (g) C. H 2(g)

a. A only b. B only c. C only d. B and C e. A, B, and C
13. The value of H 0 for the decomposition of calcium chloride into its constituent
elements is …?

CaCl 2(s) Ca (s) + Cl 2(g)

a. – 0.00 b. -397.9 c. + 397.9 d. -795.8 e. +795.8
14. The value of G 0 at 25 0 C for the oxidation of solid elemental sulfur to gaseous
sulfur trioxide is …?

2S (s, rhombic) + 3O 2(g) 2 SO 3(g)

a. +740.8 b. -370.4 c. +370.4 d. -740.8 e. +185.2
15. For the reaction
C (s) + H 2 O (g) CO (g) + H 2(g)

H 0 = 131.3 kJ/mol and S 0 = 133.6 J/K.mol at 298K. At temperatures (in 0 C) greater
than which of the choices is this reaction spontaneous under standard conditions?
a. 273 b. 325 c. 552 d. 710 e. 983
16. For a reaction to be spontaneous under standard conditions at all
temperatures, the signs of H 0 and S 0 must be and respectively.
a. +, + b. +, - c. -, + d. -, - e. +, 0
17. The oxidation number on the nitrogen in nitrate is
a. -1 b. -3 c. -5 d. +5 e. +3
18. The equation that represents a reaction that is not a redox reaction is:

Reaction 1: 2H 2 + O 2 2H 2 O
Reaction 2: Zn + CuSO 4 ZnSO 4 + Cu
Reaction 3: 2H 2 O 2 2H 2 O + O 2
Reaction 4: H 2 O + CO 2 H 2 CO 3
a. 1 b. 2 c. 3 d. 4 e. all are redox reactions
19. During the electroplating of silver, silver ions in solution:
a. oxidized at the anode b. oxidized at the cathode c. reduced at the anode
d. reduced at the cathode e. do not change
20. When chromium changes from an oxidation state of +3 to that of +6, the
Cr 3+ must:
a. gain 3 electrons b. lose 3 electrons c. gain 6 electrons d. lose 6 electrons
21. The standard hydrogen electrode is assigned a potential of _______ volts.
a. -2 b. -1 c. 0 d. +1 e. +2
22. In an electrochemical cell, ________________ occurs at the anode and
________________ occurs at the cathode.
a. oxidation, reduction b. reduction, oxidation c. depends on the kind of cell
23 - 25. Write balance equations for the following redox reactions:
a. NaBr + Cl 2 NaCl + Br 2  
b. Fe 2 O 3 + CO Fe + CO 2 in acidic solution
c. CO + I 2 O 5 CO 2 + I 2 in basic solution

Explanation / Answer

Answer:

Extant is not considered as a part of the thermodynamic as such this explicitly get covered in the equilibrium only

For the spontaneous reactions, there has to be a positive change in the entropy and they should be self-acted that is why the should be endothermic

Any spontaneous reaction in general procced towards right without any external intervention

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