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CHM test 6

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Question 1
Question 1




         In Gay-Lussac's law, the pressure of a gas increases due to an increase in temperature because
         Answer

               there is a decrease in the volume of the container.

               the molecules strike the walls of the container less often.

               the molecules strike the walls of the container more often.

               the molecules get bigger.

               there is an increase in the number of gas particles.




Question 2
Question 2




         According to the kinetic theory of gases, a gas can be compressed much more than a liquid or solid
         because
         Answer

               a gas is composed of very small particles.

               gas particles move rapidly.

               gas particles do not attract or repel one another.

               the particles of a gas are very far apart.

               gas particles move faster when the temperature increases.


Question 3
Question 3




         A 5.00-L tank contains helium gas at 1.50 atm. What is the pressure of the gas in mm Hg?
         Answer

               1.50 mm Hg

               7.5 mm Hg
               760 mm Hg

               507 mm Hg

               1140 mm Hg


Question 4
Question 4




         Complete the following statement: In Charles' law, the volume of a gas _____ when the _____ decreases.
         Answer

               increases, pressure

               decreases, temperature

               increases, temperature

               decreases, pressure

               increases, quantity of gas


Question 5
Question 5




         A gas sample in a closed, expandable container of initial volume 5.00 L was allowed to warm from 25°C to
         35°C. What was its new volume?
         Answer

               4.84 L

               7.00 L

               3.57 L

               5.17 L

               4380 L


Question 6
Question 6




         According to Avogrado's law,
         Answer

               the volume of a gas is inversely related to the number of moles at standard temperature and
               pressure.
               the volume of a gas is inversely related to the number of moles at constant temperature and
               pressure.
               the volume of a gas depends only on the number of moles in the sample.

               the volume of a gas depends only on the temperature and pressure.

               the volume of a gas is directly related to the number of moles at constant temperature and pressure.


Question 7
Question 7




         A gas at 5.00 atm pressure was stored in a tank during the winter at 5.0°C. During the summer, the
         temperature in the storage area reached 40.0°C. What was the pressure in the gas tank then?
         Answer

               5.63 atm

               4.44 atm

               0.625 atm

               40.0 atm

               69.5 atm


Question 8
Question 8
         A sample of argon at 300.°C and 50.0 atm pressure is cooled in the same container to a temperature of
         0.°C. What is the new pressure?
         Answer

               54.9 atm

               45.5 atm

               23.8 atm

               105 atm

               42.7 atm


Question 9
Question 9




         A sample of nitrogen gas had a volume of 500. mL, a pressure in its closed container of 740 torr, and a
         temperature of 25°C. What was the new volume of the gas when the temperature was changed to 50°C
         and the new pressure was 760 torr?
         Answer
              450 mL

              400 mL

              970 mL

              530 mL

              240 mL


Question 10
Question 10




        A cyclopropane-oxygen mixture is used as an anesthetic. If the partial pressure of cyclopropane in the
        mixture is 330 mm Hg and the partial pressure of the oxygen is 1.0 atm, what is the total pressure of the
        mixture in torr?
        Answer

              330 torr

              1.4 torr

              430 torr

              1100 torr

              760 torr


Question 11
Question 11




        Which of the following is NOT a potential use for a hyperbaric chamber?
        Answer

              treatment for burns and infections

              treating a diver with the bends

              increasing the rate at which a broken bone heals

              counteracting carbon monoxide poisoning

              treating some cancers


Question 12
Question 12
        A balloon is filled with helium gas. For the following question(s), select the letter of the balloon diagram that
        corresponds to the given change in conditions.




        The temperature is changed from 50°C to -150°C at constant pressure.
        Answer

               B

               C

               A

               A and B

               B and C


Question 13
Question 13




        At 570. mm Hg and 25°C, a gas sample has a volume of 2270 mL. What is the final pressure (in mm Hg) at
        a volume of 1250 mL and a temperature of 175°C?
        Answer

               690 mm Hg

               7000 mm Hg

               1560 mm Hg

               470 mm Hg

               210 mm Hg


Question 14
Question 14
        At STP conditions, 11 g of SO2 have a volume of
        Answer

              3.8 L.

              250 L.

              0.0076 L.

              22 L.

              130 L.


Question 15
Question 15




        A gas sample contains 4.0 g of CH4 and 2.0 g of He. What is the volume of the sample at STP?
        Answer

              17 L

              5.6 L

              30. L

              130 L

              11 L


                                                                                             uestion 16
Question 16




        The temperature of a 500. mL sample of gas increases from 150. K to 350. K. What is the final volume of
        the sample of gas, if the pressure in the container is kept constant?
        Answer

              1170 mL

              110 mL

              210 mL

              0.0047 mL

              0.0095 mL


Question 17
Question 17
        The pressure exerted by a gas on its container is directly proportional to
        Answer

               the mass of the individual gas molecules.

               the Fahrenheit temperature of the gas.

               the centigrade temperature of the gas.

               the number of molecules of gas in the sample.

               the volume of the container.


Question 18
Question 18
        The total pressure in a mixture of gases is equal to the partial pressure(s) of
        Answer

               the gas with the highest molecular weight.

               the gas with the greatest number of moles.

               the gas with the smallest number of moles.

               all the gases added together.

               the gas that occupies the largest volume.


Question 19
Question 19




        A gas contained in a steel tank has a pressure of 1.5 atm at a temperature of 320 K. What will be the gas
        pressure when the temperature changes to 450 K?
        Answer

               1.1 atm

               1.5 atm

               2.1 atm

               0.47 atm

               0.94 atm


Question 20
Question 20
        Which of the following is NOT part of the kinetic theory of gases?
        Answer

              Gas particles do not attract or repel one another.

              There is very little empty space in a gas.

              A gas is composed of very small particles.

              Gas particles move rapidly.

              Gas particles move faster when the temperature increases.


Question 21
Question 21




        Which of the following correctly describes the partial pressures of gases in the body?
        Answer

              high O2, high CO2, oxygenated blood

              high O2, low CO2, deoxygenated blood

              high O2, high CO2, tissue

              high O2, low CO2, oxygenated blood

              low O2, low CO2, deoxygenated blood


Question 22
Question 22




        A tank contains helium gas at 490 mm Hg, nitrogen gas at 0.75 atm, and neon at 520 torr. What is the total
        pressure in atm?
        Answer

              0.55 atm

              1.5 atm

              1.0 x 103 atm

              2.1 atm

              1600 atm


Question 23
Question 23
        The pressure of 5.0 L of gas increases from 1.50 atm to 1240 mm Hg. What is the final volume of the gas,
        assuming constant temperature?
        Answer

              5.0 L

              0.0060 L

              5.4 L

              4100 L

              4.6 L


Question 24
Question 24




        The unit of 1 atmosphere used to describe the pressure of a gas is equal to
        Answer

              760 mm Hg.

              200 mm Hg.

              600 mm Hg.

              100 mm Hg.

              1 mm Hg .


Question 25
Question 25




        At STP, temperature and pressure have the values of
        Answer

              760 K and 273 atm.

              273 K and 760 mm Hg.

              0 K and 1 atm.

              273 K and 1 mm Hg.

              0 K and 760 mm Hg.

				
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