F02_E4A - Chemistry 111 Page 1 out of 8 Exam IV/Fall 2002 Answer Key Bonus(1 point What holiday do we celebrate at the end of this month Hint Doc

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

View Full Document Right Arrow Icon
Chemistry 111 Page 1 out of 8 Exam IV /Fall 2002 Answer Key Bonus (1 point): What holiday do we celebrate at the end of this month? Hint… Doc likes sandwiches made with leftover turkey made the following way… Bread, turkey, turkey, bread, turkey, turkey, bread… Thanksgiving! 1. In the derivation of W = - n R T ln (V 2 /V 1 ), we went in one particular step from… W = P ext dV to… W = P gas In order to do this, we assumed that… the process is reversible . (02 pts) 2. In that same derivation, we went in another step from… W = P gas to… W = n R T V In order to do this, we assumed that… the gas is ideal . (02 pts) 3. Finally, in that same derivation, we went from… W = n R T V to… W = n R T dV V In order to do this, we assumed that… the process is isothermal . (02 pts)
Background image of page 1

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

View Full DocumentRight Arrow Icon
Chemistry 111 Page 2 out of 8 Exam IV /Fall 2002 Answer Key Questions 4-8 are true false questions. (02 pts each) 4. False The reversible, isothermal work of expansion for a Vander Waals gas can be determined with the following equation: W = - nRT ln (V 2 /V 1 ). This equation is only valid for ideal gases. We even derived an equation on the homework for this particular situation, remember? 5. True The entropy content of a given substance can never be negative. The lowest value for the absolute entropy (entropy content) for a substance is zero and that is only true at the absolute zero of temperature (0 K). 6. False The standard absolute entropy for liquid carbon tetrachloride is 216 eu, while that of gaseous carbon dioxide is only 214 eu. This is because liquids have a higher entropy content than gases. False! We would have expected the entropy of the gas to be higher than that of the liquid. However, it is unfair to compare these two substances, since the molecular weight of CCl 4 is much higher than that of CO 2 . 7. False The total energy of a given system can never change, according to the first law of thermodynamics. False. That would be true had it stated that the total energy of the universe can never change… 8. True In an isothermal, reversible expansion of an ideal gas, all the heat absorbed by the gas is converted into work (in theory).
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.

This note was uploaded on 02/08/2010 for the course CHEM 111 taught by Professor Kenney during the Spring '08 term at Case Western.

Page1 / 8

F02_E4A - Chemistry 111 Page 1 out of 8 Exam IV/Fall 2002 Answer Key Bonus(1 point What holiday do we celebrate at the end of this month Hint Doc

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