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Free CLEP Science and Mathematics Exam Braindumps (page: 49)

Page 48 of 128
PDF with 494 Questions

Which of the following has an atomic number of 12 and has 2 electrons in its valence shell?

  1. Be
  2. Mg
  3. C
  4. Na
  5. F

Answer(s): B

Explanation:

Magnesium has an atomic number of 12 and its electron configuration is [Ne]3s2.



Vanadium crystallizes in a body-centered cubic lattice, like the one shown below. How many Vanadium atoms are present in a unit cell?

  1. 2
  2. 3
  3. 5
  4. 8
  5. 9

Answer(s): A

Explanation:

There are eight points in the unit cell on a corner, which count as 1/8 of an atom each. In addition, there is one point within the body of the unit cell. Thus, there are two Vanadium atoms per unit cell.



A common rule when preparing acidic solutions is to always add acid to water. Which of the following is not a reason for this rule?

  1. Mixing strong acids with water produces a large amount of heat.
  2. Mixing strong acids with water causes rapid cooling.
  3. Adding water to acid could result in splashing concentrated acid.
  4. Adding acid to water initially produces a very dilute solution.
  5. There is no reason to add acid to water instead of adding water to acid.

Answer(s): B

Explanation:

Dissolving acid in water is an exothermic process.



A common rule when preparing acidic solutions is to always add acid to water. Which of the following is not a reason for this rule?

  1. Mixing strong acids with water produces a large amount of heat.
  2. Mixing strong acids with water causes rapid cooling.
  3. Adding water to acid could result in splashing concentrated acid.
  4. Adding acid to water initially produces a very dilute solution.
  5. There is no reason to add acid to water instead of adding water to acid.

Answer(s): B

Explanation:

Dissolving acid in water is an exothermic process.






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