Name___________________________________                             

Gases

DIRECTIONS: Circle the answer that best completes each statement.


1. Which of the following are described by a linear graph with 
a slope of 1 (assume 1 mole of an ideal gas)?
  (a) PV versus V with constant T
  (b) P versus T with constant V
  (c) T versus V with constant P
  (d) V versus P with constant T

a&b			a&c			b&c			b&d


2. For an ideal gas at constant temperature:                                                                                                                                                                              
  (a) doubling the pressure doubles the volume.
  (b) Tripling the volume triples the pressure.
  (c) Reducing the pressure to one third its original value triples 
       the volume. 
  (d) The volume occupied by gas molecules is zero.
 
a&d			b&c			a,b&c			c&d


3. Ideal gas particles
  (a) move randomly.                                    
  (b) have no kinetic energy.               
  (c) have no mass.
  (d) repel each other at high pressure.                      

all of				a&c			a,c&d			b&d
the above


4. The values of a and b in the table below for an ideal gas are, 
     respectively,

P (atm)			V (cm3)			T (oC)
-------------------------------------------------------
1			6240			25
2			a			25
1			b			55
                                                           
  (a) 3120 and 6870
  (b) 3120 and 5670                      
  (c) 12,480 and 2840
  (d) 12,480 and 13,700

a			b			c			d


5. At a certain temperature the diffusion rate of helium is 0.21 m/s.  
     Under the same conditions 
  (a) the diffusion rate of hydrogen is 0.15 m/s.
  (b) the diffusion rate of hygrogen is 0.30 m/s.
  (c) the diffusion rate of CH4 will be higher.
  (d) the diffusion rate of NH3 will be lower.

none of			a&c			b&c			b&d        
the above


6. The values of a and b in the table below for one mole of an ideal 
    gas are, respectively,

P (atm)			V (dm3)			T (oC)
--------------------------------------------------------
1.0			50.0			75
1.0			110			a
2.0			b			75

  (a) 165oC and 100 dm3 
  (b) 165oC and 25 dm3
  (c) 493oC and 100 dm3
  (d) 493oC and 25 dm3

a			b			c			d


7. The ideal gas equation is
  (a) PV = nT / R 
  (b) P / V = nRT
  (c) PVn = RT
  (d) PV = nRT

a			b			c			d


8. At STP,
  (a) T = 0oC, P = 1 atm 
  (b) T = 100oC, P = 100 kPa
  (c) the volume occupied by an ideal gas is inversely proportional 
        to its molecular weight.
  (d) the volume occupied by an ideal gas is 22.4L.

a&c			a&d			b&c			b&d


		
9. The values of a and b in the table below for an ideal gas are, respectively,

n			P (atm)			T (oC)			V (L)
-------------------------------------------------------------------------------------
2			2.0			0			a
2			2.0			100			b

  (a) 44.8 L and 15.3 L
  (b) 11.2 L and 8.2 L
  (c) 22.4 L and 8.2 L
  (d) 22.4 L and 30.6 L

a			b			c			d


10. 3.0 L of nitrogen trifluoride gas is reacted with 3.0 L of steam to 
     produce the gases HF, NO, and NO2 at constant 
     temperature and pressure.  Assuming a 100% yield, which of the 
     following statements are true?

  (a) A total of 8.0 L of gas will be produced.
  (b) A total of 5.0 L of gas will be produced.
  (c) A total of 6.0 L of gas will be produced.
  (d) All of the nitrogen trifluoride will be consumed.

a&d		b&d			c only				b only


11. Which of the following are true statements?
  (a) R = (PV) / (nT)
  (b) The closer a gas is to the liquid state, the more it will deviate 
       from the ideal gas law.
  (c) H20 behaves more ideally than H2.
  (d) A balloon filled with argon is smaller than an identical  balloon 
       filled with helium (assume constant T, P, & n) 

all of			a&b			b&d			a,b&d
the above


12. Which gases have the same rate of diffusion?
  (a) C2H2 
  (b) N2
  (c) CO
  (d) CH4

all of			a,b&c			b&c			c&d
the above


13. The pressure of helium inside a steel container can be lowered by   
  (a) adding methane gas to it.
  (b) adding steam to it.
  (c) increasing the temperature.
  (d) decreasing the temperature.

a&d			b&d			b&c			d only


14. One mole of oxygen at STP                                          
  (a) has a mass of 16 g.
  (b) has a volume of 1.0 L.
  (c) contains 6.02 X 1023 molecules
  (d) has a pressure of 760 mmHg.

all of			a&c			a,b,&c			c&d
the above


15. Two 1.0 L steel cylinders each contains 1.0 mole of gas at 0oC.  
     One cylinder contains CO2, and the other, O2.  Both cylinders
  (a) have the same pressure.
  (b) have the same mass.
  (c) have the same density.
  (d) are at STP.

a only			b only			b&d			b,c&d  

16. Which of the following gases are less dense than air at STP?
  (a) CH4
  (b) C3H8
  (c) NH3
  (d) NO2

a only			a,b&c			c&d			a&c


17. For the reaction

C(s) + O2(g) ---------> CO2(g)

at constant T and P, which of the following are true statements?
  (a) 2.0 L of O2 will yield 3.0 L of CO2
  (b) 1.0 mole of C(s) will yield 1.0 L of CO2
  (c) 1.0 mole of C(s) will yield 22.4 L of CO2
  (d) 6.0 L of O2 will yield 3.0 L of CO2

a&b			d only			c only			none of
									the above

18. Which of the following are true statements?
  (a) The value for the gas constant is 0.0821 L.atm/mol.K.
  (b) One mole of O2 occupies 22.4 L at STP.
  (c) 1 atm = 760 mmHg
  (d) 0oC = -273 K

a,b&c			b,c&d			a,c&d			all of
									the above

19. The density of NO2 gas at STP is 
  (a) 2.05 g/L
  (b) 46.0 g/L
  (c) less than the density of NH3 at STP
  (d) less than the density of SO2 at STP

a&d			b&c			a&c			b&d

20. The rate of diffusion of helium is 3.1592 times greater than the rate 
      of diffusion of
  (a) N2
  (b) argon
  (c) CH4
  (d) carbon monoxide

a			b			c			d