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Thermodynamics Individual Quiz
By Vivian Lim Li Hui
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Last updated over 3 years ago
7 questions
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Question 1
1.
HCl dissolves readily in water to form an acidic solution.
HC
l
(g) → H
+
(aq) + C
l
–
(aq)
What will be the change in entropy?
Negative
Positive
No change
Question 2
2.
Above 840°C, calcium carbonate will decompose to produce calcium oxide and carbon dioxide gas. CaCO
3
(s) → CaO(s) + CO
2
(g)
What is the entropy change of the reaction?
Negative
Positive
No change
Question 3
3.
Sodium hydroxide reacts with copper sulfate to give a pale blue precipitate.
2NaOH(aq) + CuSO
4
(aq) → Cu(OH)
2
(s) + Na
2
SO
4
(aq)
What is the entropy change of the reaction?
Negative
Positive
No change
Question 4
4.
Describe and explain the change in entropy when water is heated from 293K to 343K?
Question 5
5.
Which of the following can explain why an endothermic reaction can be spontaneous?
The reaction happens at very high temperatures.
The system becomes less disorder.
The Gibbs free energy of the reaction is positive.
Question 6
6.
Methanol undergoes combustion and produces carbon dioxide and water.
Using the standard molar entropy values, calculate the standard entropy change of combustion of methanol.
[Standard entropy values/ J K
−1
mol
−1
: CH
3
OH(l):
126.8
, O
2
(g):
205.0
, CO
2
(g):
213.6
, H
2
O(l):
69.9
]
+ 80.9 J K
−1
mol
−1
- 80.9 J K
−1
mol
−1
+21.6 J K
−1
mol
−1
-21.6 J K
−1
mol
−1
Question 7
7.
2NaHCO
3
(s) → Na
2
CO
3
(s) + CO
2
(g) + H
2
O(g)
[standard enthalpy change of reaction, ∆H =
−135.6
kJ mol
−1
; standard entropy change of reaction ∆S =
−334
J K
−1
mol
−1
]
What is the maximum temperature for which this reaction is spontaneous?
0.406 K
0.405 K
405 K
406 K