Practice Quiz

MCAS Chemistry Exam Practice - Question List

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61. The density of a gas is 1.35 g/L at standard temperature and pressure (STP). What is the molar mass of the gas at STP?
  1. 0.0603 g/mol
  2. 6.02 g/mol
  3. 22.4 g/mol
  4. 30.2 g/mol
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62. The three main types of nuclear radiation are alpha, beta, and gamma. Which of the following lists these types of radiation from highest penetrating power to lowest penetrating power?
  1. alpha, gamma, beta
  2. beta, alpha, gamma
  3. beta, gamma, alpha
  4. gamma, beta, alpha
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63. Water cools from 2°C to -2°C. During this time, what happens to the motion of the molecules?
  1. The motion of the molecules stops.
  2. The motion of the molecules increases.
  3. The motion of the molecules decreases.
  4. The motion of the molecules remains the same.
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64. Which of the following explains why saltwater is considered a mixture?
  1. It is composed of one element.
  2. It is composed of one compound.
  3. It is composed of two or more substances and has new
    chemical properties.
  4. It is composed of two or more substances that retain their own chemical properties.
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65. 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 ions in the large crystals.
  3. Fewer potassium ions and bromide ions have been separated from each other in the powder than in the crystals.
  4. Powdered potassium bromide is less dense than large crystals of potassium bromide.
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