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MCAT Warm-up
MCAT III

1 .       Passage I (Questions 1-8)

What is the color of a solution that absorbs light having an energy of 239 kJ/mol? 



2 .       Passage I (Questions 1-8)

The region on the chart between 400 and 60 nm shows how many distinct, visible solution colors? 



3 .       Passage I (Questions 1-8)

The highest energy transition in Table 2 corresponds to absorption by which of the following compounds? 



4 .       Passage I (Questions 1-8)

The replacement of one ammonia in Co(NH3)6+3 by a water molecule results in a shift in absorption from: 



5 .       Passage I (Questions 1-8)

Using the data from Table 1, choose the expression that best describes the relationship between energy (in kJ/mol) and (in nm): 



6 .       Passage I (Questions 1-8)

Which of the diagrams in Table 3 could be used to explain the absorption of cis-Co(NH3)4Cl2+



7 .       Passage I (Questions 1-8)

Which of the diagrams in Table 3 explains the absorption of the complexes that appear to be blue solutions? 



8 .       Passage I (Questions 1-8)

Which of the diagrams in Table 3 predicts one or more possible transitions in the ultraviolet region of the spectrum? 



9 .       Passage II (Questions 9-14)

The purpose of the salt bridge in the experiment is to: 



10 .       Passage II (Questions 9-14)

The reduction potential for Ag+, E° is 0.799 volts. For the net reaction that occurs in the overall cell, what is E°cell in v? 



11 .       Passage II (Questions 9-14)

For how many time values listed in the chart does the value of V change by more than 0.010 v from the previous time? 



12 .       Passage II (Questions 9-14)

If the apparatus were modified so that the solutions on each side could mix through a horizontal connecting tube, the measured voltages would: 



13 .       Passage II (Questions 9-14)

Which of the following best describes the relationship among the voltage and the concentrations on each side? 



14 .       Passage II (Questions 9-14)

Suppose that C1 represents the concentration of silver ion on the left of the cell, while C2 represents the concentration on the right. Which of the following best describes the relation between C1 and C2



15 .       Passage III (Questions 15-22)

Which of the following best explains the result of reaction 1? 



16 .       Passage III (Questions 15-22)

Which of the following could have been the second component in reaction 2? 



17 .       Passage III (Questions 15-22)

Which of the following could be the second component in reaction 4? 



18 .       Passage III (Questions 15-22)

The pH of the resulting solution in reaction 3 is closest to which of the following? 



19 .       Passage III (Questions 15-22)

Which of the following could be the second component in reaction 5? 



20 .       Passage III (Questions 15-22)

An investigator wishes to predict the result when 1 mole of ammonium chloride is mixed with an equal amount of strong base. Which reaction from the chart most closely resembles this reaction? 



21 .       Passage III (Questions 15-22)

The final product of which reaction would make a useful buffer? 



22 .       Passage III (Questions 15-22)

After reaction 6, the original formic acid: 



23 .       Passage IV (Questions 23-31)

Based on the table, when the circuit is closed in cell A, in which direction do electrons flow through the voltmeter? 



24 .       Passage IV (Questions 23-31)

Based on the table, at which electrode does reduction occur in cell B? 



25 .       Passage IV (Questions 23-31)

By studying cells B and C, the students can determine that: 



26 .       Passage IV (Questions 23-31)

By studying cells A and C, the students can determine that which of the following statements are true? 



27 .       Passage IV (Questions 23-31)

By examining the result for cell A only, what can the students find the reduction potential for Pb2+/Pb to be? 



28 .       Passage IV (Questions 23-31)

By examining the results for cells A and B only, the students can find that compared to the half-cell reduction potential for Ni2+, the reduction potential for Zn2+/Zn: 



29 .       Passage IV (Questions 23-31)

According to the chart, will Zn react spontaneously with 1 M Pb2+ in solution? 



30 .       Passage IV (Questions 23-31)

If the reduction potential for Ni2+/Ni is taken arbitrarily to be 1.00 v, what is the reduction potential for Pb2+/Pb? 



31 .       Passage IV (Questions 23-31)

If "cell D" were to be made up as cells A through C were, but with Pb2+/Pb and Zn2+/Zn as the half-cells, what would be the voltage and polarity? 



32 .       Passage V (Questions 32-35)

The chemist decides instead to measure the freezing point of each solution. This method will distinguish between the two compounds because: 



33 .       Passage V (Questions 32-35)

The freezing point depression is directly proportional to the: 



34 .       Passage V (Questions 32-35)

In order to distinguish between the solutions using the freezing point depression, the chemist must assume that: 



35 .       Passage V (Questions 32-35)

The chemist measures the freezing point depression and finds which of the following? 



36 .       Passage VI (Questions 36-41)

The above diagram indicates which of the following? 



37 .       Passage VI (Questions 36-41)

The pressure exerted on the piston that would prevent any net flow of water from solution A to solution B is equal to: 



38 .       Passage VI (Questions 36-41)

If solution A were replaced by water, what would happen to the pressure required to prevent net flow of water? 



39 .       Passage VI (Questions 36-41)

The osmotic pressure of a red blood cell is about 7.7 atm. A red blood cell immersed in water will most likely: 



40 .       Passage VI (Questions 36-41)

The osmotic pressure of a 0.10 M glucose solution is: 



41 .       Passage VI (Questions 36-41)

Which of the following phenomena best explains osmosis? 



42 .       Which of the following procedures would allow an experimenter to determine Ea for a given reaction? 



43 .       Which of the following will NOT change the total pressure in a closed vessel containing N2 gas? (Assume ideal gas behavior.)

I. Increasing the temperature.

II. Replacing half the N2 molecules with gaseous helium atoms.

III. Adding an equal amount of gaseous hydrogen. 



44 .       A student wishes to find the solubility of Ba(IO3)2, for which Ksp = 1.6 x 10-9. If x represents the solubility, which equation should she solve? 



45 .       For which of the gas-phase reactions below would S be expected to be negative?

I. 2H2O --> 2H2 + O2

II. 2H --> H2

III. N2 + 3H2 --> 2NH3 



46 .       For the reaction 2NO2(g)N2O4(g), which of the following is true?

I. Removing NO2 shifts the equilibrium to the left.

II. Increasing the volume of the container shifts the equilibrium to the right.

III. Adding helium gas to the container shifts the equilibrium to the right. 



47 .       The pH of a solution of 0.001 M NaOH is closest to which of the following? 



48 .       A student wishes to prepare a buffer whose pH is 6.3, using an acid HA with a pKa of 6.0. Which expression below will correctly express the ratio R of HA to NaA that must be mixed in order to achieve the desired pH? 



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