answerkey - Sample Midterm Questions for CHEM 204 Fall 2008...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Sample Midterm Questions for CHEM 204, Fall 2008 Constants and Conversions: 0 K = -273 C 1 Pa = 1 N/m 1 atm = 101 kPa = 760 torr = 1 bar 1 J = 1 (kg-m^2)/s^2 1 L-atm = 101.3 J R = 8.314 J/(mol-K) = 0.082 (L-atm)/(mol-K) Na = 6.02 x 10^23 kB = 1.38 x 10^-23 J/K 1 cal = 4.184 J A Periodic Table will also be provided. Short Answer Questions (Multiple Choice)--total of 50 points, likely to be 20 questions. 1. One assumption in the kinetic theory of gases is that the collisions between the molecules and the walls of the container - which give rise to pressure - are elastic, (i.e., the molecules rebound with the same speed after colliding with the wall). Suppose that the collisions are not elastic, (i.e., the rebounding speed is less than the approaching speed) how would the pressure of the gas be affected? A) non-elastic collisions would decrease the pressure. B) non-elastic collisions would increase the pressure. C) non-elastic collisions would not change the pressure. D) non-elastic collisions account for the volume of the gas. E) None of the above 2. The term nxb in the van der Waals equation accounts for A) The molecular volume of the gas B) Intermolecular repulsions and molecular volume C) Intermolecular attractions that result in fewer collisions and reduction in force per collision D) All of the above are right E) The gas real size and mass 3. One 10 L container contains 1 mol of He (ideal monoatomic gas, atomic weight 4 g/mol) A second 10 L container contains 1 mol of H2 (ideal diatomic gas, molecular weight 2 g/mol). If both containers are initially at the same temperature, and we deliver 10 kJ of heat to each of the two containers. A) The average Kinetic Energy of He molecules will be ½ the average Kinetic Energy of H2 following the 10 kJ energy addition. B) The average Kinetic Energy of He molecules will increase in the same amount than the average Kinetic Energy of H2 following the 10 kJ energy
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
addition. C) The increase in temperature upon 10 kJ addition is larger for H2 than for He. D) The average Kinetic Energy of He molecules will increase more than the
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 6

answerkey - Sample Midterm Questions for CHEM 204 Fall 2008...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online