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Free CLEP Science and Mathematics Exam Braindumps (page: 37)

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PDF with 494 Questions

One of the outermost electrons in a tin atom in the ground state can be described by which of the following sets of four quantum numbers (n, l, m1, ms)?

  1. 6, 0, +1, +1/2
  2. 6, 0, -1, +1/2
  3. 6, 1, 2, +1/2
  4. 6, 2, 1, +1/2
  5. 6, 3, 2, +1/2

Answer(s): B

Explanation:

The electron configuration of tin, Sn, is [Kr]5s25d106p2. To describe one of the 6p electrons, n is 6, l is 1 (the p orbital corresponds to 1= 1), m1 can be -1, 0 or 1, and ms is either + or -.





Given two solutions ZnSO4(1M) and CuSO4(1M) in an electrochemical cell, as shown above, answer question.

Given the following standard reduction potentials, what is the standard emf of the electrochemical cell at 25° C?

Cu2+ + 2e- Cu E0 = 0.34 V

Zn2+ + 2e- Zn E0 = -0.76 V

  1. +1.1 V
  2. +0.42 V
  3. -0.42 V
  4. -l.l V
  5. None of the above

Answer(s): A

Explanation:

Remember, losing electrons is oxidation and gaining electrons is reduction. In the cell, zinc is oxidized, so rewrite the given information as:

Cu2+ + 2e- Cu E0 = 0.34 V

Zn Zn2+ + 2e- E0 = +0.76 V Zn + Cu2+ Zn2+ + Cu E0 = +1.1 V and sum the reactions to get the overall reaction and the value of the standard emf.





Given two solutions ZnSO4(1M) and CuSO4(1M) in an electrochemical cell, as shown above, answer question.

The salt bridge in the cell docs which of the following?

  1. The salt bridge is where reduction takes place.
  2. The salt bridge is where oxidation takes place.
  3. The salt bridge allows neutral ions to interact with ions in solution.
  4. The salt bridge allows the two solutions to mix.
  5. The salt bridge allows positive and negative ions to flow freely.

Answer(s): E

Explanation:

The salt bridge allows for the migration of ions from one half-cell to the other. The salt bridge contains inherently inert salts, so no reactions would take place within the salt bridge.



Which of the following represents the structure of an alkali metal?

  1. 19X9
  2. 11X5
  3. 24X12
  4. 40X20
  5. 40X19

Answer(s): E

Explanation:

Alkali metals are the Group 1A elements, i.e. Li, Na, K, etc. 40X19 corresponds to potassium, K.






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