Exam I

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Question #1

Consider the following reaction

8A(g) + 5B(g) → 8C(g) + 6D(g)

If [C] is increasing at the rate of 4.0 M/s, at what rate is [B] changing?

A 4.8 M/s

B 3.3 M/s

C 6.4 M/s

D 0.40 M/s

E None is correct

F 2.5 M/s

Question #2

Please indicate if the following molecules are A), paramagnetic or diamagnetic and B), if they exabit color or colorless.
[Fe(NH3)4 ]3+

A paramagnetic and exabits color

B paramagnetic and colorless

C diamagnetic and colorless

D diamagnetic and exabits color

Question #3

Please indicate if the following molecules are A), paramagnetic or diamagnetic and B), if they exabit color or colorless.
[Fe(NO2)6 ]3-

A diamagnetic and exabits color

B paramagnetic and colorless

C diamagnetic and colorless

D paramagnetic and exabits color

Question #4

Please indicate if the following molecules are A), paramagnetic or diamagnetic and B), if they exabit color or colorless.
[Co(NH3)6 ]3+

A diamagnetic and colorless

B paramagnetic and colorless

C paramagnetic and exabits color

D diamagnetic and exabits color

Question #5

Please indicate if the following molecules are A), paramagnetic or diamagnetic and B), if they exabit color or colorless.
[MnF6 ]3-

A diamagnetic and exabits color

B paramagnetic and colorless

C paramagnetic and exabits color

D diamagnetic and colorless

Question #6

Consider the complex ion [Co(L)6]4- where L represents a ligand with a charge of -1. The above complex ion has 1 unpaired electron. Select the choices that includes the true statements.

A The metal ion is a d1 ion. It is diamagnetic.

B none of the choices are true

C The ligands are strong field ligands. It is a low spin complex.

D The metal ion is a d1 ion. The ligands are strong field ligands.

Question #7

Please Match the following: Which of the compounds will the possible isomerism? [Fe(CO)3(NH3)3]3+

A No possible isomers

B Ionization

C Fac-Mer

D Optical

Question #8

Please Match the following: Which of the compounds will the possible isomerism? [PtClBr(NH3)N2] (tetrahedral)

A Fac-Mer

B Optical

C Ionization

D Linkage

Question #9

Please Match the following: Which of the compounds will the possible isomerism? [Cu(CO)5O2]Br

A Cis-Trans

B Ionization

C Optical

D No possible isomers

Question #10

Please Match the following: Which of the compounds will the possible isomerism? [Zn(NH3)5Cl]Br

A Ionization

B No possible isomers

C Linkage

D Fac-Mer

Question #11

Please Match the following: Which of the compounds will the possible isomerism? [CrC2O4 (OH2)4]-

A Ionization

B Fac-Mer

C Cis-Trans

D No possible isomers

Question #12

Please Match the following: Which of the compounds will the possible isomerism? [Cu(SCN)4]3-

A Optical

B Linkage

C Ionization

D No possible isomers

Question #13

The complex ion [V(NH3)4(OH)2]3+ absorbs blue (use 450nm) in aqueous solution.
What would be the estimated observed color of the complex ion of [V(NH3)5(OH)]4+
(I- < Br- < Cl- < F- < OH- < H2O < NH3 < en < NO2- < CN- ) The color observed =

A white

B yellow-orange

C violet

Question #14

The complex ion [V(NH3)4(OH)2]3+ absorbs blue (use 450nm) in aqueous solution.
Estimate the crystal field splitting energy (in kJ) for this ion. ( h = 6.626 x 10-34 J s and c = 3.0 x 108 m/s ) (to enter powers of 10 use the following format: 1.0×10^-8 and keep your answer to 3 sig figs)
crystal field splitting energy = ______ kJ

A 3.99×10^-19

B 4.42×10^-19

C 4.36×10^-19

Question #15

What is the formula of potassium aquabromobis(oxalato)cobaltate(III).

A K3[CoBr(H2O)(C2O4)2]

B K2[Co(H2O)Br(O)2]

C none of these

D K2[Co(H2O)Br(C2O4)2]

E K[Co(H2O)Br(O)2]

Question #16

What is the name of the following Transition metal compound,
Fe[AlF6]

A iron(III) hexafluoroaluminate(III)

B iron(II) hexafluoroaluminum(III)

C iron aluminum hexafluoride

D aluminum hexafluoroferrate

E iron(I) aluminum(III)hexafluoride

Question #17

When a 14.2 g of an unknown compound is dissolved in 200.0 grams of water the boiling point of the solution is 100.56 ˚C. The % ionization of the compound is 39.07 % with an i exp value of 3. (Freezing and boiling point constants for H2O: kf=1.86˚/m, kb= 0.512 ˚/m).
What would be the molar mass of the unknown compound = ? g/mol

A 136

B 129

C 116

D 102

Question #18

A petroleum company separates benzene (78 g/mol) and n-octane (114 g/mol) by distillation. In one run, the starting solution was 85% n-octane by mass at 25°C. The vapor pressures for benzene and n-octane at this temperature after they are mixed, are 11 torr and 95 torr, respectively.
What would be the vapor pressure of pure n-octane?

A 116 torr

B 119.5 torr

C 128 torr

D 126 torr

Question #19

A 0.104

B 0.091

C 0.214

D 0.131

Question #20

A 0.205

B 0.229

C 0.191

D 0.116

Question #21

An aqueous solution of CaCl2 has a normal boing point of 108.3 oC. What would be the freezing point of this solution? For water Kb = 0.510 oC/m and Kf = 1.86oC/m. (pure water boils at 100 oC and freezes at 0 oC)
(Keep your answer to 3 sig figs and just input the number, no need for units)
Tf = ___ oC

A -28.1

B -30.3

C -36.8

D -40.6

Question #22

Two aqueous solutions, A and B, are separated by a semipermeable membrane. The osmotic pressure of solution B immediately begins to decrease. Which of the following statements is true?

A (3) The solvent molecules are moving from the solution of higher osmotic pressure to that of lower osmotic pressure.

B (2) The initial osmotic pressure of solution B is greater than that of solution A.

C Both (1) and (3) are true statements.

D (1) Solvent molecules are moving from solution B into solution A.

Question #23

The concentration of iodide in an aqueous solution is 551 parts per million (ppm) by mass. What is the molarity of iodide in sea water? The molar mass of iodide is 126.9g/mole. (The density of sea water is 1.025 g/mL.)
(Please express your answer to 2 sig figs and just input the number, no need for units)
Molarity of the sea solution is =____ M

A 0.0056

B 0.0027

C 0.0042

D 0.0039

Question #24

Aqueous ammonia is commercially available in a solution that is 31.6% (w/w, w/w means weight/weight) ammonia (Molar Mass of NH3 is 17.03g/mole and water is 18.02g/mole) . What is the molality of ammonia in such a solution? (The density of solution is 1.120 g/mL).
(please express your answer to 3 sig figs and just input the value, no units needed)
molality = ___ m

A 23.4

B 27.1

C 26.7

D 25.2

Question #25

What are the major solute-solvent interactions created when CH3CH2NH2 dissolves in CH3CHO?

A London or dispersion

B hydrogen bonding

C dipole-dipole

D ion-dipole

E dipole-induced dipole

F ion-induced dipole

Question #26

The possible reasons for the solubility of NaCl (solute) in water (H2O) (Solvent) are the ________.

A Large amount of energy imputed to break the solvent-solvent interaction. Large amount of energy released due to mixing of solute and solvent. Large amount of energy imputed to break the solute-solute interaction.

B Small amount of energy imputed to break the solute-solute interaction. Small amount of energy released due to mixing of solute and solvent. Small amount of energy imputed to break the solvent-solvent interaction.

Question #27

Arrange the given compound and order them according to increasing solubility in Water. (Least soluble to most soluble).
(1) CH3CH2CH2CH2CH2CH2CH2OH
(2) CH3OCH3
(3) HOCH2CH2OH
(4) CCl4

A The solubility of
CH3CH2CH2CH2CH2CH2CH2OH
CCl4
CH3OCH3
HOCH2CH2OH

B The solubility of
CCl4
CH3CH2CH2CH2CH2CH2CH2OH
CH3OCH3
HOCH2CH2OH

C The solubility of
CCl4
CH3OCH3
CH3CH2CH2CH2CH2CH2CH2OH
HOCH2CH2OH

D The solubility of
CH3OCH3
CH3CH2CH2CH2CH2CH2CH2OH
CCl4
HOCH2CH2OH

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