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PE Chemical Chemistry — practice by topic

Browse 30 questions across 3 Chemistry topics. Choose what you want to revise, then open a question to check its answer and worked solution.

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Chemistry (30)Gas Laws (30)Physical Chemistry (30)

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An engineer reports a pressure in SI units. The SI unit of pressure is the:Read the answer and worked solution →The pressure unit torr is named after the inventor of the barometer:Read the answer and worked solution →A water barometer is impractical because normal air pressure supports a water column over:Read the answer and worked solution →Mercury is used in barometers instead of water because mercury is denser by a factor of about:Read the answer and worked solution →

Worked practice questions

An engineer reports a pressure in SI units. The SI unit of pressure is the:

  1. Pascal
  2. Pendant
  3. Peridot
  4. Plateau
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Correct answer: A. Pascal

1. Pressure is force spread over an area. 2. One newton acting on one square metre defines the unit. 3. That unit is the pascal. _Source: OpenStax Chemistry 2e, Chapter 9, Gases._

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The pressure unit torr is named after the inventor of the barometer:

  1. Tomlinson
  2. Torricelli
  3. Trevithick
  4. Thorndike
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Correct answer: B. Torricelli

1. The instrument measures atmospheric pressure with a liquid column. 2. Its inventor gave his name to the unit. 3. That inventor was Evangelista Torricelli. _Source: OpenStax Chemistry 2e, Chapter 9, Gases._

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A water barometer is impractical because normal air pressure supports a water column over:

  1. 10 metres
  2. 10 inches
  3. 10 furlongs
  4. 10 fathoms
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Correct answer: A. 10 metres

1. The denser the liquid, the shorter the column needed. 2. Water is far less dense than mercury. 3. So a water column runs over 10 metres high. _Source: OpenStax Chemistry 2e, Chapter 9, Gases._

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