1. Calculate the pH of a solution made by mixing 100.0 mL of 0.300 M NH3 with 100.0 mL of 0.100 M HCI. (Kbfor NH3 is 1.8 x 10^-5).
A) 9.56 B) 10.6 C) 4.44 D) 3.40 E) none of these
2. When a stable diatomic molecule spontaneously forms from its atoms, what are the signs of
A) - - -
B) + + +
C)- + +
D)- - +
E) + - -
3. At o-c, the ion-product constant of water, Kw' is 1.2 x to-15. The pH of pure water at O°C is: A) 7.00 B)7.46 C) 6.88 D) 7.56 E) none of these
4. The pH ofa 0.150M solution of a weak base is 10.98. Calculate the pH of a 0.0400 M
solution of the base.
A) 11.5 B) 11.2 C) 10.5 D) 10.7 E) none of these
5.)
is for exothermic reactions and for endothermic reactions.
A)Cannot tell B ) favorable, unfavorable C) unfavorable, unfavorable D) favorable, favorable E) unfao
.Use the following to answer question 6:
A solution containing 10. mmol of C032- and 5.0 mmol of HC03 - is titrated with 1.0 MHCI.
6. What total volume ofHCI must be added to reach the second equivalence point?
A) 30. mL B) 10. ml, C)20. mL D) 5.0 mL E) 25 mL
7. Which of the following salts shows the lowest solubility in water?
(K values:SDAg2S = 1.6 x 10-49; Bi2S3 = 1.0 x 10-72; HgS = 1.6 x 10-54; Mg(OH)2 = 8.9 x 10-12;
MnS = 2.3 x10-13)
A) Bi2S3
B) Ag2S
C) Mg(OH)2
D) MnS
E) HgS
8. Which of the following statements is (are) always true?
must increase.
II. A system cannot have both energy disorder and positional disorder.
/).G
ill, DSuniv =T
IV. SO is zero for elements in their standard states.
A) I
B) II, IV
C) I. ill, IV
D) II
E) I, IV
Use the following to answer question 9:
The enthalpy of vaporization of ethanol is 38.7 kJ/mol at its boiling point (78°C).
9. Calculate the value of M when 1.00 mole of ethanol is vaporized at 78.0°C and 1.00 atm.
A) -110. JlKmol B) -496 JIK mol C) 110. JIK mol D) 496 JIK mol E) 0
10. A 0.1O-mol sample of a diprotic acid, ~A, is dissolved in 250 mL of water. The Kal of this acid is 1.0 x 10-5and Ka2 is 1.0 x 10-10• Calculate the concentration of A2- in this solution.
A) 0.40 M B) 1.0 x 10-5 M C)1.0 x 10-10 M D) 2.0 x 10-3 M E) 4.0 x 10-6 M
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