University:
Montclair State University
Course:
PHYS 100 | Introduction to Physical Science
Academic year:

2024
Views:

360

Pages:

3
Author:

V. Frederic

Note: Although the Practice Test is a Doc, the Test will be a Google Form. Multiple Choice Questions: Highlight the correct answer. 1) A temperature of 200oC is equivalent to? a) -100 K b) 0K c) 100 K d) 273 K e) 473 K 2) A sample of gas initially at 2.00 atm was compressed from 16 L to 2.00 L at constant temperature. After the compression, the gas pressure was __________ atm. a) 4.00 b) 2.00 c) 1.00 d) 8.00 e) 16.0 3) According to kinetic-molecular theory, if the temperature of a gas is raised from 100 K to 400 K, the average kinetic energy of the gas will increase by a factor of_____. a) 1.5 b) 2.0 c) 3.0 d) 4.0 e) 5.0 4) According to kinetic-molecular theory, if the temperature of a gas is raised from 100oC to 400oC, the average kinetic energy of the gas will increase by a factor of_____. a) 1.8 b) 2.0 c) 2.6 d) 3.0 e) 4.0 5) Which of the following is not part of the kinetic-molecular theory? a) Attractive and repulsive forces between gas molecules are negligible. b) The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container. c) Atoms are neither created nor destroyed by ordinary chemical reactions. d) Gases consist of molecules in continuous, random motion. e) Collisions between gas molecules do not result in the loss of energy. 6) Of the above gases, which will have the lowest rate of effusion at a given temperature? a) Br2 b) I2 c) O2 d) NO e) CO2 7) Of the above gases, which will have the highest average molecular speed at 25 °C? a) Br2 b) I2 c) O2 d) NO e) CO2 8) Of the above gases, which would deviate least from ideal gas behavior? a) Br2 b) I2 c) O2 d) NO e) CO2 Free Response Problems: Submit you work for problems 9-12 9) What is the volume of a 3.5 mol sample of neon gas at 290 K and 1.2 atm? The volume is 69.4L V=? n=3.5 T=290k p=1.2 1.2(V)=3.5(0.08206)(290) 1.2=83.3 83.3/1.2=69.4 10) A balloon originally had a volume of 3.9 L at 320 K and a pressure of 1.4 atm. The balloon must be heated to _434.9____ K to increase its volume to 5.3 L (at constant pressure). N1/V1=N2/V2 N1=3.9L V1=320k N2=5.3L V2=? 320x5.3/3.9=434.9 11) An unknown gas was found to effuse at a rate equal to two times that of krypton gas. The molecular weight of the unknown gas is ______336____ g/mol. Rate of Effussion of Krypton=Ra=2 Rate of Effusion Unknown=Rx=1 Molecular Mass of Krypton= Kr=84gmol Molecular mass of unknown Mx=? Ra/Rx= 2/1 Or (2/1)^2 =( )^2 4/1=Mx/84 4=Mx/84 4x84=Mx Mx=336g/mol 12) Which of the two gases, N2 or H2O, deviates more from ideal behavior? Justify your response. H2O deviates more from ideal behavior because water has larger molecules, and is slower at a given temperature. Water also occupies more space than Nitrogen.

Gases Practice Test

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