CHEMISTRY UNIT TEST (2) 84%
The volume of a gas is 450 mL when its pressure is 1.00 atm. If the temperature of the gas does not change, what is the pressure when its volume is changed to 2.00 L? Use mc004-1.jpg. 0.225 atm 0.444 atm 2.25 atm 4.44 atm
0.225 atm
A container holds 6.4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.24 atm. What is the partial pressure of hydrogen? Use mc032-1.jpg. 0.31 atm 0.93 atm 5.2 atm 31 atm
0.31 atm
A gas cylinder contains 2.0 mol of gas X and 6.0 mol of gas Y at a total pressure of 2.1 atm. What is the partial pressure of gas Y? Use mc017-1.jpg. 0.50 atm 1.6 atm 2.1 atm 2.8 atm
1.6 atm
Which equation is derived from the combined gas law? mc009-1.jpg mc009-2.jpg mc009-3.jpg mc009-4.jpg
A
Which equation represents the combined gas law? mc007-1.jpg mc007-2.jpg mc007-3.jpg mc007-4.jpg
C
Which law relates to the ideal gas law? mc004-1.jpg mc004-2.jpg mc004-3.jpg mc004-4.jpg
C
Which law is described by saying that doubling the absolute temperature will double the pressure of a sample of gas in a rigid container? Boyle's law Charles's law Dalton's law Gay-Lussac's law
Charles's law
Which law states that the volume and absolute temperature of a fixed quantity of gas are directly proportional under constant pressure conditions? Boyle's law Charles's law Dalton's law Gay-Lussac's law
Charles's law
Which law states that the pressure and absolute temperature of a fixed quantity of gas are directly proportional under constant volume conditions? Boyle's law Charles's law Dalton's law Gay-Lussac's law
Gay-Lussac's law
The absolute temperature of a gas is increased four times while maintaining a constant volume. What happens to the pressure of the gas? It decreases by a factor of four. It increases by a factor of four. It decreases by a factor of eight. It increases by a factor of eight.
It increases by a factor of four.
If a gas is moved from a large container to a small container but its temperature and number of moles remain the same, what would happen to the pressure of the gas? It would increase. It would be halved. It would stay the same. It would slightly decrease.
It would increase.
Which statement can best be concluded from the ideal gas law? The product of pressure and volume of an ideal gas is proportional to the absolute temperature. All collisions between atoms or molecules are perfectly elastic and are not the result of any attractive forces. The temperature, pressure, and volume of a gas are all related. The behavior of a gas under real conditions does not obey the ideal gas law.
The product of pressure and volume of an ideal gas is proportional to the absolute temperature.
Which describes the volume of 1 mol of gas at standard temperature and pressure? The volume is greater for a larger mass of gas. The volume is the same for any gas. The volume depends on the size of the container. The volume varies with the pressure.
The volume is the same for any gas.
Avogadro's law and Charles's law describe a proportionality of the volume of a gas when the pressure is constant. Which describes the proportionality that allows these laws to be combined when describing a gas? Volume is directly proportional to temperature (Avogadro's law) and to moles (Charles's law). Volume is inversely proportional to temperature (Avogadro's law) and to moles (Charles's law). Volume is directly proportional to moles (Avogadro's law) and to temperature (Charles's law). Volume is inversely proportional to moles (Avogadro's law) and to temperature (Charles's law).
Volume is directly proportional to moles (Avogadro's law) and to temperature (Charles's law).
The incomplete table below shows selected characteristics of gas laws. Name Variables Constants Equation ? Pressure, volume Temperature, moles of gas PV = k Charles's law ? ? V = kT Gay-Lussac's law ? ? ? Combined gas law ? ? mc025-1.jpg What are the variables in Gay-Lussac's law? pressure and volume pressure, temperature, and volume pressure and temperature volume, temperature, and moles of gas
pressure and temperature
Which best defines partial pressure in a mixture of gases? pressure that is exerted by all the gases of a mixture on the container pressure that is exerted by one gas as if it occupied a container by itself half of the pressure that is exerted by the gases of a mixture on the container sum of the individual pressures that are exerted by two or more gases
pressure that is exerted by one gas as if it occupied a container by itself
If the pressure, volume, and temperature of a gas are known, which can most likely be found by using the ideal gas law? the molar amount of the gas the partial pressure of the gas the standard temperature and pressure the molar mass
the molar amount of the gas
A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00 atm, what is the new volume of the balloon in the hot room? Use mc005-1.jpg. 2.19 L 3.33 L 3.68 L 5.60 L
5.60 L
A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide, oxygen, and nitrogen. Which term most likely describes what she is measuring? final pressure atmospheric pressure combined pressure partial pressure
partial pressure
The table below shows a comparison of the different gas laws. Some cells have been left blank. Name Variables Constants Equation Boyle's law Pressure, volume ? PV = k Charles's law Volume, temperature ? V = kT ? Temperature, pressure Volume, moles of gas P = kT ? Pressure, temperature, volume ? mc022-1.jpg Which are assumed to be constant while using the combined gas law? pressure number of moles volume and moles of gas pressure and temperature
pressure
If the pressure, volume, and the number of moles of a gas are known, which is needed to calculate the universal gas constant from the ideal gas law? the temperature of the gas the molar volume of the gas the molar mass of the gas the partial pressure of the gas
the temperature of the gas
The incomplete table below shows selected characteristics of gas laws. Name Variables Constants Equation ? ? ? PV = k Charles's law ? ? V = kT ? Temperature, pressure ? P = kT Combined gas law Pressure, temperature, volume ? ? Which constants would most likely be filled in the first row of the table? temperature and moles of gas volume and temperature pressure and volume pressure and moles of gas
temperature and moles of gas
Five gases combined in a gas cylinder have the following partial pressures: 3.00 atm (N2), 1.80 atm (O2), 0.29 atm (Ar), 0.18 atm (He), and 0.10 atm (H). What is the total pressure that is exerted by the gases? Use mc020-1.jpg. 5.08 atm 5.19 atm 5.27 atm 5.37 atm
5.37 atm
Which law is based on the graph that is shown below? mc001-1.jpg Boyle's law Charles's law Dalton's law Gay-Lussac's law
Boyle's law
The gas in the piston is at constant temperature. A student increases the pressure on the piston from 2 atm to 3 atm. The observation will be summarized in a row of the incomplete table below. mc026-1.jpg Row Name Observation Constants 1 Boyle's law ? ? 2 Charles's law ? ? 3 Gay-Lussac's law ? Volume, moles of gas 4 Combined gas law ? ? Which row of the table and which observation would the student fill? row 1, volume decreases when temperature decreases row 1, volume decreases when pressure increases row 3, volume decreases when temperature decreases row 3, volume decreases when pressure increases
row 1, volume decreases when pressure increases
