Chapter 5 Practice Test Flashcards
Using the barometer shown in the figure, determine the pressure in terms of atmosphere.
0.576 atm
Which of the following statements about gases is not true?
There are strong, attractive forces between gas molecules.
The volume occupied by a sample of gas is 5,780 cm3 of space. What is this volume in liters?
5.78L
Suppose you have 2.9 L of helium at 1.0 atm of pressure. According to Boyle’s Law, at what pressure will cause the gas to expand to 3.5 L?
0.83 atm
Suppose the volume of the gas at the top of a closed can of mineral water is 1.9 cm3. When the can is opened (at standard conditions), the gas expands to a volume of 6.5 cm3. Use Boyle’s Law to find the original gas pressure inside the can before the can was opened. You can assume that the temperature and amount of gas are constant.
3.4 atm
A sample of gas is at an initial volume of 2.7 L and a temperature of 45°C. If the gas volume increases to 4.2 L, what will its temperature be? You can assume that the pressure remains constant.
490 K
At what temperature (Kelvin) would a gas have no volume at all?
0 K
Suppose that 2.3 L of gas at 35°C and 1.0 atm is expanded to 4.5 L at 42°C. What will the final pressure of the gas be?
0.52 atm
An airplane takes off from the ground at 1.00 atm. There is a 2.0 L bottle in the baggage compartment. The bottle is filled with a mixture of nitrogen, oxygen, and carbon dioxide gases. From takeoff to 30,000 ft, the temperature drops from 27°C to −80°C. The plane then descends to 10,000 ft. What is the change in the pressure of the bottle from 30,000 ft to 10,000 ft if the temperature at the final altitude is −50°C?
0.100 atm increase
A helium balloon with a volume of 2.4 L contains 0.10 moles of gas at 25°C and 1 atm of pressure. The balloon leaks 0.02 moles of gas until someone manages to seal the hole. What is the new volume of the balloon?
2 L
In an experimental design, a sample of gas is collected over water at 25.0°C and 1 atm. The gas occupies as much volume as it “wants,” by displacing the water. The space above the water has a volume, V1, of 36.0 ml. Then more gas is bubbled through, until the new volume, V2, is 72.0 ml. The number of moles of gas in the space above the water is _______________
doubled.
A poisonous gas is being transported from Texas to California. The container is 4000.0 L and 4°C. It can withstand a pressure of 100.0 atm. Which of the following is the maximum safe amount of gas to ship?
1.76 × 10^4 mol
At STP (standard temperature and pressure), there are 0.0357 moles of methane gas (CH4 ) in an 8.0 × 102 mL cylinder. What is the pressure exerted by the gas in the cylinder if the temperature is raised from 273 K to 320 K?
1.2 atm
Two gas tanks are linked by a connecting tube with a valve. One contains 10 L of helium at 6.7 atm of pressure. The other contains 4.2 L of nitrogen at 3.6 atm of pressure. If the valve is opened, what is the final pressure of the two tanks combined?
5.8 atm
A tank of gas is found in the coldest part of the refrigerator (at “standard temperature,” 0°C = 273 K). It contains 4 moles of gas: 1 mole of oxygen and 3 moles of neon. The volume of the tank is 11.2 L. What is the partial pressure of oxygen in the tank?
2.0 atm