MCAT Question of the Day

Infrared spectroscopy is often used to determine the presence of a carbonyl group in a compound. It is a strong band appearing at about 1700 cm^-1 in aldehydes, ketones, and carboxylic acids and their derivatives. A carboxylic acid will show another carbon oxygen stretching band at:

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The benzene ring typically undergoes:

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Which of the following compounds will not react with acetyl chloride?

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For the reaction 2NO2 –> N2O4, which of the following is true?

I. Adding NO2 shifts the equilibrium to the right.
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.

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

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A student wishes to find the solubility of PbCl2, whose K(sp) = 7 x 10^-29. Which equation should she solve to do so?

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Which of the following will NOT change the pressure in a closed vessel containing N2 gas?

I. Increasing the temperature
II. Replacing half the N2 molecules with helium atoms
III. Doubling the volume of the vessel

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Toluene will show peaks in its:

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Which of the following is closest to the pH of a mixture made up of 0.1 M each formic acid (whose Ka is 1.8 x 10^-4) and potassium formate?

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A student finds that BaCO3 is more soluble in HNO3 than in plain water. Which of the following is a likely explanation for this effect?

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Photo attributed to Joost.