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level: 1/1/2021

Questions and Answers List

level questions: 1/1/2021

Question	Answer
14. Which of the following is true for a buffered solution? A) The solution resists change in its [H+]. B) The solution will not change its pH very much even if a concentrated acid is added. C) The solution will not change its pH very much even if a strong base is added. D) Any H+ ions will react with a conjugate base of a weak acid already in solution. E) All of these.	ANS: E PTS: 1 DIF: Easy REF: 15.2 KEY: Chemistry \| general chemistry \| acids and bases \| solutions of a weak acid or base with another solute \| buffer
29. Which of the following favors the solubility of an ionic solid in a liquid solvent? A) a large magnitude of the solvation energy of the ions B) a small magnitude of the lattice energy of the solute C) a large polarity of the solvent D) all of the above E) none of the above	ANS: D PTS: 1 DIF: Easy REF: 11.2 KEY: Chemistry \| general chemistry \| solutions \| solution formation \| solubility \| ionic solution
19. You have a certain mass of helium gas (He) in a rigid steel container. You add the same mass of neon gas (Ne) to this container. Which of the following best describes what happens? Assume the temperature is constant. A) The pressure in the container doubles. B) The pressure in the container increases but does not double. C) The pressure in the container more than doubles. D) The volume of the container doubles. E) The volume of the container more than doubles.	ANS: B PTS: 1 DIF: Easy REF: 5.2 KEY: Chemistry \| general chemistry \| phases \| gas \| empirical gas laws \| Avogadro's law MSC: Conceptual
23. An analytical procedure requires a solution of chloride ions. How many grams of NaCl must be dissolved to make 1.95 L of 0.0561 M Cl–? A) 3.28 g B) 0.595 g C) 6.39 g D) 1.64 g E) 12.8 g	ANS: C PTS: 1 DIF: Moderate REF: 4.3 KEY: Chemistry \| general chemistry \| chemical reactions \| working with solutions \| concentration
36. An ion is formed A) By either adding or subtracting protons from the atom. B) By either adding or subtracting electrons from the atom C) By either adding or subtracting neutrons from the atom. D) All of the above are true. E) Two of the above are true.	ANS: B PTS: 1 DIF: Easy REF: 2.6 KEY: Chemistry \| general chemistry \| early atomic theory \| chemical substance \| chemical formula \| ionic substance