Unit 7 Gasses

As the temperature of a gas increases at constant pressure, the volume of the gas

• decreases

• increases

• remains the same

The volume of a sample of a gas at 273 degrees Celsius is 200 liters. If the volume is decreased to 100 liters at constant pressure, what will be the new temperature of the gas?

• 0 Kelvin

• 100 K

• 273 K

• 546 K

Standard temperature and a pressure of 0.5 atmosphere are equal to

• 0 degrees Celsius and 51.6 kPa

• 32 degrees Celsius and 51.6 kPa

• 0 degrees Celsius and 101.3 kPa

• 32 degrees Celsius and 101.2 kPa

One reason that a real gas deviates from an ideal gas is that the molecules of the real gas have

• a straight-line motion

• no net loss of energy on collision

• a negligible volume

• forces of attraction for each other

Equal volumes of SO_2(g) and O_2(g) at STP contain the same number of

• atoms

• molecules

• electrons

• protons

At which temperature is the vapor pressure of ethanol equal to the vapor pressure of propanone at 35°C?

• 35°C

• 60°C

• 82°C

• 95°C

A sample of oxygen gas is sealed in container X. A sample of hydrogen gas is sealed in container Z. Both samples have the same volume, temperature, and pressure. Which statement is true?

• Container X contains more gas molecules than container Z.

• Container X contains fewer gas molecules than container Z.

• Containers X and Z both contain the same number of gas molecules.

• Containers X and Z both contain the same mass of gas.

A sample of a gas has a volume of 40 mL at 76.0 kPa. What will be the new volume of the gas if the pressure is increased to 80.0 kPa, temperature remaining constant?

• 80 mL

• 42 mL

• 38 mL

• 20 mL

A gas sample has a volume of 25.0 milliliters at a pressure of 1.00 atmospheres. If the volume increases to 50.0 milliliters and the temperature remains constant, the new pressure will be

• 1.00 atm

• 2.00 atm

• 0.250 atm

• 0.500

Two basic properties of the gas phase are

• a definite shape and a definite volume

• a definite shape but no definite volume

• no definite shape but a definite vollume

• no definite shape and no definite volume