jFinal Examination Spring2011.Name R.Lopez de laVega

Bubble in the form number in the section entitled Grade or Educ in the scantron.MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.

1) An Arrhenius acid is best defined as a 1)A) substance that dissociates in water to produce aqueous hydrogen ions.B) substance that dissociates in water to produce aqueous hydroxide ions.C) proton acceptor.D) hydroxide donor.

2) An Arrhenius base is best denned as a 2)A) substance that dissociates in water to produce aqueous hydrogen ions.B) substance that dissociates in water to produce aqueous hydroxide ions.C) proton donor.D) hydroxide acceptor.

3) A Br0nsted-Lowry acid is best defined as a substance that can 3)A) donate a hydroxide ion. B) accept a hydroxide ion.C) accept a proton. D) donate a proton.

4) What are the Br0nsted-Lowry acids in the following chemical reaction 4)HBr(sol) + CH3COOH(sol) ^= CH3C(OH)2+(sol) + Br-(sol)?

A) HBr, CH3COOH B) CH3COOH, CH3C(OH)2+

C) CH3COOH, Br- D) HBr, CH3C(OH)2+

5) Which of the following Br0nsted-Lowry acids does not behave as a strong acid when it is 5)dissolved in water?

A)HC1 B)HNC>2 C) HC1O4 D) HBr

6) From the following chemical reactions determine the relative Br0nsted-Lowry acid strengths 6)(strongest to weakest).

HCl(acj) + H2O(/) -» HsO^) +

HCN(a<7) + H2O(/) ̂ H3O+(fl(?)

A) H3O+ > HC1 > HCN B) HCN > H3O+ > HC1

C) HC1 > H3O+ > HCN D) HC1 > HCN > H3O+

7) Calculate the pH for an aqueous solution of acetic acid that contains 2.15 x 10-3 M hydronium 7)ion.

A) 11.33 B) 2.15 x 10-3 C) 4.65 x 10-12 D) 2.67

8) What is the hydroxide ion concentration of a lye solution that has a pH of 11.20? 8)A) 1.58 x 10-3 M B) 6.31 x 10-12 M C) 11.20 M D) 2.80 M

9) What is the pH of a 0.020 M HC1O4 solution? 9) _A) 1.70 B) 0.040 C) 0.020 D) 12.30

10) What is the pH of a 0.020 M Ba(OH)2 solution? 10)A) 1.70 B) 12.60 C) 12.30 D) 1.40

11) What is the strongest monoprotic acid of the following set if all the acids are at 0.100 M 11)concentration?

A) hydrofluoric acid with Ka = 3.5 x 10-4 B) benzoic acid with Ka = 6.5 x 10-5

C) hypochlorous acid with Ka = 3.5 x 1Q-8 D) acetic acid with Ka = 1.8 x 10-8

12) A solution with a hydrogen ion concentration of 3.25 x 10-2 M is _ and has a 12)hydroxide concentration of .

A) acidic, 3.08 x 10-12 M B) basic, 3.08 x 10-13 MC) acidic, 3.08 x 10-13 M D) basic, 3.08 x 10-12 M

13) Determine the acid dissociation constant for a 0.010 M nitrous acid solution that has a pH of 13)2.70. Nitrous acid is a weak monoprotic acid and the equilibrium equation of interest isHNO2(fl<?) + H2O(/) =^ H3O+(«(?) + NO2-(fl<?).

A) 8.0 x 10-3 B) 4.0 x 10-4 C) 2.0 x 10-3 D) 5.0 x 10-4

14) What is the pH of a 0.100 M NH3 solution that has Kb = 1.8 x 10-5 ? The equation for the 14)dissociation of NH3 is

NH3(fl(?) + H2O(/) ̂ NH4+H) + OH-(a^)?A) 1.87 B) 12.13 C) 2.87 D) 11.13

15) Calculate the pH of a of 0.100 M KBrO solution. Ka for hypobromousacid, HBrO, is 2.0 x 10-9. 15)A) 3.15 B) 10.85 C) 9.15 D) 4.85

16) What is the weakest acid among the following? 16)A)H2S B)SiH4 C) PH3 D) HC1

17) Which acid of the following set has the strongest conjugate base? 17)A) H2O B) HF C) CH4 D) NHs

18) What is the strongest acid among the following? 18)A)H2S B)H2Se C) H2O D) H2Te

19) Identify the Lewis acid that acts as a reactant in the following reaction 19)Co(H2O)63+(a<7) + 6 NH3(fl(?) -* Co(NH3)63+(fl<?) + 6 H2O(Z).

A)H2O B)NH3 C) Co(H2O)63+ D) O>3+

In the following reaction the unshaded spheres represent H atoms.

(1) (3) (4)

O=H = 0

20) Identify the Br0nsted-Lowry acids.A) (2) and (4) B) (2) and (3) C) (1) and (3)

20)D) (1) and (4)

21) Of the elements indicated on the periodic table shown above, which forms the strongest binary 21)acid, H2X or HX, where X = A, B, C, or D?

A) A B)B C)C D)D

22) Of the elements indicated on the periodic table shown above, which forms the strongestoxoacid acid with the formula H2XO3 or HXO3, where X = A, B, C, or D?

A) A B) B C) C D) D

22)

23) BF3 and NH3 undergo a Lewis acid-base reaction forming an adduct. Which picture below 23)

correctly represents the curved arrow notation for the initial Lewis acid-Lewis base interactionin this reaction; what is the Lewis acid and the Lewis base?

•v»

SF B IN.

" \ V-

•7M

(2)

H

A) Picture (2) is correct; B?3 is the Lewis acid and NH3 is the Lewis base.B) Picture (3) is correct; NH3 is the Lewis acid and BF3 is the Lewis base.C) Picture (1) is correct; NH3 is the Lewis acid and BF3 is the Lewis base.D) Picture (4) is correct; BF3 is the Lewis acid and NH3 is the Lewis base.

24) What is the pH of a solution prepared by mixing 100.00 mL of 0.20 M HCI with 50.00 mL of 0. 24)10 M HCI? Assume that the volumes are additive.

A) 0.78 B) 1.70 C) 0.52 D) 0.15

25) Calculate the pH of a 0.100 M CH3NH3C1 solution. Kb for methylamine, CH3NH2, is 25)3.7 x 10-4.

A) 5.78 B) 8.22 C) 11.78 D) 2.22

26) What is the pH of a 0.100 M NHs solution that has Kb = 1.8 x 10-5? The equation for the 26)dissociation of NH3 is

NH3H) + H2O(I) — NH4+H) + OH-(aq).A) 11.13 B) 12.13 C) 1.87 D) 2.87

27) Calculate the hydronium ion concentration in an aqueous solution that contains 2.50 x 10~3 M 27)in hydroxide ion?

A) 4.00 x 10-H M B) 4.00 x 10-12 M C) 4.00 x 10-10 M D) 5.00 x 10-12 M

28) Calculate the hydroxide ion concentration in an aqueous solution that contains 3.50 x 1Q-3 M 28)in hydronium ion?

A) 2.86 x 10-12 M B) 2.86 x 10-4 M C) 3.50 x 10-12 M D) 2.86 x 10~H M

Answer KeyTestname: UNTITLED1

2)B3)D4)D5)B6)C7)D8) A9) A

10) B11) A12) C13) D14) D15) B16) B17) C18) D19) D20) D21) D22) B23) A24) A25) A26) A27) B28) A