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Free CLEP Science and Mathematics Exam Braindumps (page: 45)

Page 44 of 128
PDF with 494 Questions

The spontaneous exothermic reaction, PCl5(l) + Cl2(g) PCl5(s) has what signs for G, H, and S?

  1. Option A
  2. Option B
  3. Option C
  4. Option D
  5. Option E

Answer(s): C

Explanation:

Spontaneous reactions have a negative
G. H is negative for an exothermic reaction. The entropy of the system decreases (a solid is created from a liquid and a gas), so S is negative.



Which of the following are allotropes?

  1. NH3, NH4+
  2. H,O, H,S
  3. C(graphite)' C(diamond)
  4. He, Ne
  5. N2, O2

Answer(s): C

Explanation:

Allotropes are elemental substances that occur in more than one form.



How does one express 300 in scientific notation with three significant figures?

  1. 300
  2. 30 × 101
  3. 3.0 × 102
  4. 3.00 × 102
  5. 0.300 × 103

Answer(s): D

Explanation:

Proper scientific notation only uses the "ones" place and any remaining significant digits are after the decimal point.



An atom has an atomic number of 15 and an atomic mass of 31. Which of the following is false?

  1. The atom has 31 neutrons.
  2. The atom has 15 electrons.
  3. The atom has 15 protons.
  4. The atom has 16 neutrons.
  5. The atom has more neutrons than protons.

Answer(s): A

Explanation:

Phosphorous, with an atomic number of 15 and an atomic mass of 31, has 16 neutrons, not 31.






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