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Free CLEP Science and Mathematics Exam Braindumps (page: 41)

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PDF with 494 Questions

In the following reaction,

H2O + SO32- + 2Fe3+ SO42- + 2Fe2+ + 2H+ the oxidation numbers for S and Fe before and after the reaction, respectively, go from

  1. +4, +3 to +6, +2
  2. +3, +3 to +8, +2
  3. +6, +3 to +8, +2
  4. +6, +2 to +8, +3
  5. +4, +3, to +8, +2

Answer(s): A

Explanation:

S begins as +4 because O is -2 and the overall charge of the ion is -2. S becomes +6 because an additional O is added to the molecule. Fe begins as -3 and becomes -2 because the oxidation number of an individual ion is the same as its charge.



Given the following reversible reaction, 2NiS(s) + 3O2(g) 2NiO(s) + 2SO2(g) how does one express the equilibrium constant, K?

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

Answer(s): E

Explanation:

Equilibrium constants are expressed as products divided by reactants. As a rule, only liquids and gases are included in the expression.



Which of the following is most soluble in water?

  1. Methane
  2. Hydrochloric acid
  3. Toluene
  4. Octanol
  5. Ethyl ether

Answer(s): B

Explanation:

Following the rule, "like dissolves like", water is a very polar molecule, so other very polar molecules will dissolve in water. Hydrochloric acid (HCl) is the most polar compound of the choices given. Methane (CH4), Toluene (C6H5CH3), Octanol (CH3(CH2)7OH), and ethyl ether ((CH3CH2)2O) are not very polar species.



Which one of the following solutions would have the lowest freezing point?

  1. 1 molal HC1
  2. 2 molal HCl
  3. 3 molal HC1
  4. 1 molal H3PO4
  5. 2 molal H3PO4

Answer(s): E

Explanation:

Freezing point is a colligative property and solutes in water result in freezing point depression. The more ions in solution, the more the freezing point will be depressed. A 2 molal solution of H3PO4 will have the highest concentration of ions (H3PO4 3H+ + PO43-), and thus has the lowest freezing point.






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