1. As the pressure of an enclosed gas decreases to half its original value, what happens to the volume of the gas if temperature is held constant?(1 point)
The volume decreases to half of its original value.
The volume decreases to one-fourth of its original value.
The volume increases to twice its original value.
The volume increases to four times its original value.
2. Which table correctly shows the relationships between volume, pressure, and temperature of an enclosed gas?(1 point)
Quantities Relationship
volume and temperature inversely proportional
pressure and volume inversely proportional
pressure and temperature directly proportional
Quantities Relationship
volume and temperature directly proportional
pressure and volume directly proportional
pressure and temperature inversely proportional
Quantities Relationship
volume and temperature directly proportional
pressure and volume inversely proportional
pressure and temperature directly proportional
Quantities Relationship
volume and temperature inversely proportional
pressure and volume directly proportional
pressure and temperature directly proportional
3. A chemist heats a fixed amount of gas in a sealed glass container. Which law is the chemist most likely investigating?(1 point)
Charles’s law, by seeing how changes in temperature affect the volume of the gas
Gay-Lussac’s law, by seeing how changes in temperature affect the volume of the gas
Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas
Charles’s law, by seeing how changes in temperature affect the pressure of the gas
4. Which formula shows a correct representation of the combined gas law?
5. Which statement best describes the graph of the relationship between the volume and temperature of an enclosed gas?
6. There are 300 light particles in an airtight container. Which adjustment would increase the speed of the particles?
7. Which observation is inconsistent with the ideal gas law?
8. The relationships among which variable quantities are expressed by the ideal gas law equation?
9. Which measure of a gas does the expression nRT/P represent?
10. Given R=0.0821L⋅atmmol⋅K, what is the volume of mole of gas at a pressure of 3.12 atm and a temperature of 270K?(1 point)
11. Given R=0.0821L⋅atmmol⋅K, how many moles of gas are in a 1.25 L container at 300K and 2.07 atm?(1 point)
12. gaseous product of a reaction is collected at 280K and 0.95 atm. Given R=0.0821L⋅atmmol⋅K, what is the molar mass of the gas, in grams per mole, if 5.49 g of gas occupies 4.92 L?(1 point)
13. The molar volume of a gas increases by a factor of 2. Which parameter change could have caused the shift in molar volume?(1 point)
14. In one or two sentences, describe a scenario using the combined gas law in which changes occur in the pressure and temperature of an enclosed gas but the volume does not change.
15. A student wants to perform an experiment to study the relationship between the temperature and pressure of an enclosed gas. In one or two sentences, describe two assumptions that must be made in performing this experiment.(2 points)
16.Ammonia gas has a molar mass of approximately 17 grams per mole. At 290K and 1.2 atm, a sample of ammonia has a volume of 3.7 L.
In three to five sentences, explain how you can find the mass of the ammonia. Then, given R=0.0821L⋅atmmol⋅K, calculate the mass.
17. Liquid water can be separated into hydrogen gas and oxygen gas through electrolysis. 1 mole of hydrogen gas and 0.5 moles of oxygen gas is produced from 1 mole of liquid water collected in separate 10 L containers at 1 atm. Will the temperatures of the gases be equal? In one to two sentences, use the ideal gas law to explain your answer.
Anyone know the answers to this test?
1) B. The volume increases to twice its original value.
2) A. volume and temperature directly proportional
pressure and volume inversely proportional
pressure and temperature directly proportional
3) D. Gay-Lussac’s law, by seeing how changes in temperature affect the pressure of the gas
4) B. V1P1/T1=V2P2/T2
5) A. It is a straight line with a positive slope showing that an increase in temperature results in an increase in volume.
6) D. keeping the pressure constant and increasing the temperature
7) A. When temperature is held constant and volume increases, the pressure increases.
8) D. pressure, volume, temperature, number of moles
9) A. volume
10) A. 7.10 L/mol
11) A. 0.105 mol
12) B. 27 g/mol
13) B. the temperature increasing by a factor of 2