Unit 9 (Ch 13) Review (Display)

What are some of the general properties of gases that distinguish them from liquids and solids?

• Gases have a definite shape and volume.

• Gases are incompressible.

• Gases have high density.

• Gases have no definite shape.

• Gases are compressible.

What is the SI unit of pressure?

• Pascal

• Bar

• PSI

• Torr

Convert 1.20 atm to units of mm Hg, torr, and pascals.

• 1.20 atm is equivalent to 914.4 mm Hg, 914.4 torr, and 121,000 pascals.

• 1.20 atm is equivalent to 900 mm Hg, 900 torr, and 120,000 pascals.

• 1.20 atm is equivalent to 920 mm Hg, 920 torr, and 122,000 pascals.

• 1.20 atm is equivalent to 930 mm Hg, 930 torr, and 123,000 pascals.

Boyle’s law for gases tells us that:

• The pressure of a gas is inversely proportional to its volume at constant temperature.

• The pressure of a gas is directly proportional to its volume at constant temperature.

• The pressure of a gas is inversely proportional to its temperature at constant volume.

• The pressure of a gas is directly proportional to its temperature at constant volume.

What does Charles’s law tell us about how the volume of a gas sample varies as the temperature of the sample is changed?

• The volume of a gas is directly proportional to its temperature.

• The volume of a gas is inversely proportional to its temperature.

• The volume of a gas remains constant as temperature changes.

• The volume of a gas is independent of its temperature.

What temperature scale is defined with its lowest point as the absolute zero of temperature?

• Kelvin scale

• Celsius scale

• Fahrenheit scale

• Rankine scale

What is absolute zero in Celsius degrees?

• -273.15°C

• 0°C

• -459.67°C

• 273°C

What does Avogadro’s law tell us about the relationship between the volume of a sample of gas and the number of molecules the gas contains?

• Avogadro's law states that the volume of a gas is directly proportional to the number of molecules, at constant temperature and pressure.

• Avogadro's law states that the volume of a gas is inversely proportional to the number of molecules, at constant temperature and pressure.

• Avogadro's law states that the volume of a gas is independent of the number of molecules, at constant temperature and pressure.

• Avogadro's law states that the volume of a gas is directly proportional to the temperature, at constant pressure.

What equation would you use to solve this?

A sample of gas in a 10.0-L container exerts a pressure of 565 mm Hg. Calculate the pressure exerted by the gas if the volume is changed to 15.0 L at constant temperature.

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A sample of gas in a 10.0-L container exerts a pressure of 565 mm Hg. Calculate the pressure exerted by the gas if the volume is changed to 15.0 L at constant temperature.

(a)   mm Hg

Answer explanation