Chem 160.

Spring 2016


MULTIPLE CHOICE: Choose the one alternative that best completes the statement or answers the question. Answer Qs 1-30 on a scantron only. If you have erase marks at the bottom of the scantron write down the Q number and the correct answers. Each Q is worth 2 points (60 points)

1) Which of the following is not a conjugate acid/base pair?

A) HSO4-/SO42- B) S 2-/H 2S C) H 2O/OH- D) PH4+/PH3 E) HPO4 2-/PO43

2) Which of the following contain three significant figures, and no others?

I. 326.0 II. 0.00310 III. 46,900 IV. 1.070 V. 0.020

A) II and III B) II and V C) II, III and V D) IV and V E) I, III and IV

3) Perform the following mathematical operation, and express the answer to the correct number of significant figures.

12.47 g

1.026 g

135.8 g___

A) 149.3 B) 149 C) 149.30 D) 150. E) 149.296

4) The neutralization of Cr (OH)3 with H2SO4 produces which of the following products?

A) OH- B) H3O+ C)SO2 D) CrH3 E) Cr2 (SO4)3

5) In which of the following pairs of substances are both species in the pair salts?

A) NH 4F and KCl B) CaCl 2and HCN C) H2S and Ba(OH)2

D) LiOH and K2CO3 E) NaOH and HNO3

6) In a solution with a pH of 9.64 the molar concentration of the hydrogen ion would be ________.

A) 5.6 x 10-10 B) 2.9 x 10-9 C) 2.3 x 10-11 D) 2.3 x 10-10 E) 1.4 x 10-9

7) How many moles of Al are needed to react exactly with 10.00 moles of

Fe 2 O 3 according to the following equation:

Fe 2 O 3 + 2Al → Al 2 O 3 + 2Fe

A) 30.0 moles

B) 60.0 moles

C) 35.0 moles

D) 15.0 moles

E) 20.0 moles

8) What volume of 8.25 M HCl solution must be diluted to prepare 2.40 L of 0.500 M HCl solution?

A) 145 mL

B) 39.6 L

C) 984 mL

D) 0.256 L

E) 438 mL

9) Indicate which set of coefficients balances the equation

________NH3+ _______O2 → ________NO + ________H 2O

A) 6, 5, 4, 4 B) 3, 2, 2, 3 C) 2, 6, 3, 2 D) 4, 5, 4, 6 E) 3, 2, 1, 3

10) The electron configuration for a Al3+ ion is ________.

A) 1s22s22p63s23p64s23d104p6 B) 1s22s22p63s23p64s2 C) 1s22s22p63s23p1

D) 1s22s22p63s23p64s24p2 E) 1s22s22p6

11) A salt of sodium fluoride will be classified as __________ in water.

A) acidic B) basic C) neutral D) amphoteric E) none of these.

12) If the concentration of a KCl solution is 16% (m/v), then the amount of KCl in 26.0 mL of solution is ________.

A) 32.6 grams B) 61.5 grams C) 0.158 grams D) 9.84 grams E) 4.16 grams

13) If the electronegativity difference between two elements X and Y is 0.2, the bond between the two elements would be ________.

A) polar covalent B) positively charged C) nonpolar covalent

D) coordinate covalent E) ionic

14) A 0.360 M solution of KNO3 (formula mass = 101.09) which contains 125 grams of solute would have a volume of ________.

A) 3550 mL

B) 3430 mL

C) 3600 mL

D) 1250 mL

E) 7500 mL

15) According to the Bronsted-Lowry theory, a base is ________.

A) a proton donor B) a hydroxide ion donor C) a proton acceptor

D) a hydronium ion donor E) a hydronium ion acceptor

16) Which response includes all of the following that involve chemical changes and no physical changes?

I. burning charcoal

II. melting of gold

III. fermentation of grapes

IV. burning of natural gas

V. melting of ice

A) IV and V B) I, III, and IV C) I and IV D) II and V E) I, II, and III

17) In which of the following pairs of physical changes are both changes exothermic?

A) freezing, condensation B) sublimation, evaporation C) melting, deposition

D) melting, condensation E) freezing, sublimation

18) What is the mass number of a chromium isotope containing 28 neutrons?

A) 76 B) 24 C) 28 D) 52 E) 80

19) What is the maximum number of electrons in the n = 4 shell?

A) 32 B) 2 C) 18 D) 16 E) 8

20) Which of the following subshell notations for electron occupancy is an impossibility?

A) 6p 3 B) 5s 3 C) 4f11 D) 4p 5 E) 2p1

21) Which of the following is not isoelectronic with a noble gas?

A) S- B) Li+ C) F- D) N3- E) B3+

22) The mass percentage of Cl in the compound KClO3 is ________.

A) 28.93%

B) 64.19%

C) 53.87%

D) 36.51%

E) 33.33%

23) How many Cl atoms are present in 2.16 moles of NCl 3?

A) 4.33 x 1023 atoms

B) 8.4 x 1024atoms

C) 3.90 x 1024atoms

D) 6.6 x 10-26 atoms

E) 2.4 x 1022 atoms

24) In which of the following liquids would dipole-dipole interactions be the predominant intermolecular force?

A) NH3 B) HCl C) H2O D) PF3 E) both B and D

25) Which of the following kinds of intermolecular forces is found in all molecule ?

A) dipole-dipole interactions B) hydrogen bonding C) ion-ion interactions

D) Chicago forces E) London forces

26) Which one of the following polyatomic ions does not contain oxygen?

A) sulfate B) hydroxide C) ammonium D) nitrate E) carbonate

27) Which of the following is a variable-charge metal?

A) Be B) Zn C) Cs D) Ni E) Ca

28) The Lewis structure for the SO 4 2- ion contains how many "bonding electrons?"

A) 12 B) 4 C) 6 D) 8 E) 2

29) What are the number of protons, neutrons, and electrons in199F?

A) 19 protons, 9 neutrons, and 9 electrons B) 19 protons, 19 neutrons, and 19 electrons

C) 9 protons, 10 neutrons, and 9 electrons D) 9 protons, 9 neutrons, and 19 electrons

E) 9 protons, 9 neutrons, and 10 electrons

30) An ionic bond forms between two atoms through ________.

A) each atom acquiring a negative charge

B) sharing of electron pairs

C) transferring protons from the nucleus of the nonmetal to the nucleus of the metal

D) transferring of electrons from metallic atoms to nonmetallic atoms