Practice Quiz

CLEP Chemistry Practice Test - Question List

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11. The reduction of carbon dioxide by hydrogen gas takes place at 420°C to produce water vapor and carbon monoxide. The equation for this reaction at equilibrium is shown below.

H2(g) + CO2(g) ↔ H2O(g) + CO(g).

Which of the following changes in concentration occur when more water vapor is added to the system under equilibrium conditions?
  1. [H2] decreases, [CO2] decreases, [CO] increases
  2. [H2] decreases, [CO2] decreases, [CO] increases
  3. [H2] increases, [CO2] increases, [CO] decreases
  4. [H2] increases, [CO2] increases, [CO] increases
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12. A neutral atom has an outer shell electron configuration of 2s22p6. To which of the following groups of elements does it belong?
  1. alkali metals
  2. alkaline-earth metals
  3. halogens
  4. noble gases
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13. Which of the following statements best explains why water has a high surface tension?
  1. The force of attraction between neighboring polar water molecules is weak.
  2. The force of attraction between neighboring polar water molecules is strong.
  3. The force of attraction between neighboring nonpolar water molecules is weak.
  4. The force of attraction between neighboring nonpolar water molecules is strong.
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14. In which of the following lists are the elements shown in order of increasing electronegativity?
  1. Li, Be, O, F
  2. O, F, Be, Li
  3. F, Li, O, Be
  4. Li, F, Be, O
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15. The balanced equation below represents the reaction of NaOH with H3PO4:

NaOH + H3PO4 → NaH2PO4 + H2O

When 20 g of NaOH reacts with 49 g of H3PO4, 9 g of water is produced. How many grams of NaH2PO4 are produced?
  1. 11 g
  2. 60 g
  3. 69 g
  4. 78 g
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