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ID: 535509 • Letter: H
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36) in the reaction shown, which of the following describes the oxidation half reaction? 2 AI A. ALI 3 e- B, sr 2 e- D. SO. Son' 1 e- 37) Which of the following is a polyprotic acid? A. HCI B. HINO C. HizCO3 D. HF E. HCN 38) ich of the following is the proper equilibrium expression for the reaction: CF4 (R) CFA CF CF CF [C][F2] 39) For the following example, identify the following. H20@ H20(g) A. a negative AH and a negative AS B. a positive AH and a negative AS C. a negative AH and a positive AS D. a positive AH and a positive AS E. It is not possible to determine without more information. 40) A given reaction has a Gibbs free energy of -109.8 kJ, and a 96.3 K under change in entropy of standard conditions. What is the enthalpy of this reaction? A. -81.1 kJ B. 07.4 kJ C. 38.5 kJ D. 74.1 k.I E. 93.5 kJ 41) Why do alcohols have higher boiling points than aldehydes with the same number of carbon atoms? A. alcohols are more reactive B. can bond, while aldehydes cannot C. aldehydes are more polar than alcohols D. aldehydes have a greater mass than alcohols E. aldehyde molecules repel one another so have lower boiling points 42 Nickel carbonate (Nico has a Kop of 1.4 x 10 What is its molar solubility? A. 1.9x 10-4 M B. 3.3 x 103 M C. 3.7 x 10 M D. 7.0 x 105 M E. 7.4 x 10 Chemistry 102, Final Exam, Test A 6/14/2017Explanation / Answer
Answers:-
36. (C) Al -------> Al3+ + 3e-
Explanation :- Oxidation Number of Al increases as e- is donated by metal.Therfore Al is Oxidized and it is reducing agent in this balanced half reaction.
37. (C) H2CO3
Explanation :- Carbonic acid is polyprotic, because it can donate 2 protons (di- means 2). The first donation forms bicarbonate (HCO3(-)), and the second forms carbonate (CO3(2-))
38. (D) [CH4]/ [C] [F2]2
Explanation: Heterogeneous equilibrium has things present in more than one phase. The usual examples include reactions involving solids and gases,
39. (D) a positive H and a positive S
Explanation:- Spontaneous at high temperatures
(where exothermicity is relatively unimportant)
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