Practice Quiz

Praxis II: Chemistry Exam Prep - Question List

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41. Consider the following system at equilibrium:

2NOCl(g) <--> 2NO(g) + Cl2(g)

According to Le Chatelier’s principle, what will occur when the equilibrium concentration of NOCl(g) is reduced?
  1. The equilibrium concentration of NO(g) alone decreases
  2. The equilibrium concentration of Cl2(g) alone decreases
  3. The equilibrium concentrations of both NO(g) and Cl2(g) decrease
  4. The equilibrium concentration of NO(g) alone increases.
  5. There will be no effect on the concentrations of NO(g) and Cl2(g)
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42. 2Na + 2HCl --> 2NaCl + H2

If you start with 5g Na and 5g HCl, which is the limiting reactant? How much of the excess reactant is left at the end of the reaction?
  1. Limiting reactant: HCl Excess: 3.15g Na
  2. Limiting reactant: Na Excess: 2.93g HCl
  3. Limiting reactant: HCl Excess: 2.93g Na
  4. Limiting reactant: Na Excess: 1.85g HCl
  5. Limiting reactant: HCl Excess: 1.85g Na
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43. Which of the following is not true about London dispersion forces?
  1. They are the weakest intermolecular forces
  2. They arise from temporary dipoles
  3. Dispersion forces are weakest between molecules that are easily polarized
  4. Larger atoms form dipoles easier than smaller atoms, so their dispersion forces are stronger
  5. Molecular shape affects the strength of London Dispersion forces
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44. Which of the following compounds is classified as a metallic oxide?
  1. H2O
  2. Na2O
  3. CO2
  4. NO2
  5. SO2
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45. Which of the following elements is classified as a metalloid?
  1. Chlorine
  2. Zinc
  3. Aluminum
  4. Carbon
  5. Silicon
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