Practice Quiz

CLEP Chemistry Practice Test - Question List

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51. A student adds 68.4 g of sucrose (C12H22O11 ) to 750 mL of 20°C water. She stirs the solution until all of the sucrose crystals dissolve. She then transfers the solution to a volumetric flask and fills it to the 1.00 L mark with 20°C water. What is the molarity of the sucrose solution the student prepared?
  1. 0.20 M
  2. 0.70 M
  3. 1.0 M
  4. 6.8 M
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52. An unknown metal, X, combines with nitrogen to form the compound XN. Metal X also combines with oxygen to produce the compound X2O3. Metal X is most likely which of the following elements?
  1. 3Li
  2. 12Mg
  3. 31Ga
  4. 50Sn
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53. A 1.00 kg sample of water (H2O) contains 0.11 kg of hydrogen (H) and 0.89 kg of oxygen (O). According to the law of constant composition, how much hydrogen and oxygen would a 1.5 kg sample of water contain?
  1. 0.11 kg H and 0.89 kg O
  2. 0.17 kg H and 1.34 kg O
  3. 0.22 kg H and 1.78 kg O
  4. 1.34 kg H and 0.17 kg O
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54. When stirred in 30°C water, 5 g of powdered potassium bromide, KBr, dissolves faster than 5 g of large crystals of potassium bromide. Which of the following best explains why the powdered KBr dissolves faster?
  1. Powdered potassium bromide exposes more surface area to water molecules than large crystals of potassium bromide.
  2. Potassium ions and bromide ions in the powder are smaller than potassium ions and bromide ionsin the large crystals.
  3. Fewer potassium ions and bromide ions have been separated from each other in the powder thanin the crystals.
  4. Powdered potassium bromide is less dense than large crystals of potassium bromide.
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55. Which of the following is an example of a physical change?
  1. Iron exposed to air produces rust.
  2. Hydrogen combined with oxygen forms water.
  3. Sulfur combined with oxygen produces sulfur dioxide
  4. Liquid nitrogen exposed to air becomes nitrogen gas.
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