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Free CLEP Science and Mathematics Exam Braindumps (page: 40)

Page 39 of 128
PDF with 494 Questions



For the molecules above, the resultant dipole moments are oriented (from left to right):

  1. , ,
  2. , ,
  3. , ,
  4. , ,
  5. , ,

Answer(s): D



How many unpaired electrons docs the ground state of manganese have?

  1. 2
  2. 3
  3. 4
  4. 5
  5. 6

Answer(s): D

Explanation:

The electron configuration of Mn is [Ar]4s23d5. According to Hund's rule, each electron in the d shell would be unpaired, while each electron in the s shell would be paired. Thus there are five unpaired electrons.



Arrange the following gaseous ions in order of increasing atomic radius.

  1. Li+, Be2+, B3+, Na+
  2. B3+, Be2+, Na+, Li+
  3. Na+, Li+, Be2+, B3+
  4. B3+, B3+, B2+, Li+
  5. B3+, B2+, Li+, Na+

Answer(s): E

Explanation:

Within a row, atomic size decreases as the atomic number increase, but ionic size increases as the atomic number increases. Both atomic and ionic radii increase as the principal quantum number, n, increases.



Which of the following methods is best for separating a one liter sample of two miscible liquids with a boiling point difference of approximately 65° C?

  1. Fractional Distillation
  2. Chromatography
  3. Distillation
  4. Filtration
  5. Extraction

Answer(s): C

Explanation:

A distillation is the best way to separate two miscible liquids with a large difference in boiling point. Fractional distillation is useful for separating liquids with similar boiling points, chromatography is not used to separate liquids, filtration is useful to separate solids and liquids, and extraction is useful for separating non-miscible liquids.






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