CHEM 1120 Study Guide - Midterm Guide: Oxidation State, Jmol, Torr
Chem 122 Rybolt Exam 3 Spring 2009 Name______________________________________
Numerical constants may be listed below. Other needed information is given in the problem or written on
the board or found in the periodic tables you will use during exam. For numerical problems, be sure to
show your work, include units and circle your final answer. If several choices are given, circle the one
correct answer. Your written answers should be brief and to the point. You can use only your own
calculator on the exam, but no notes, books, external information, or other electronic devices are to be
used. No cell phone is to be used in Exam room.
1 cal = 4.184 J c = 3.00 x 108 m/s 1 atm = 760 torr = 1.01x105 N/m2 h = 6.63 x 10-34Js
R = 0.08206 (L atm/ mol K) R=8.31 J/mol K (K) = (oC) + 273 (oC) = ( oF - 32 ) / 1.8
1 g = 6.02x1023 amu 1 F =96485C/mol ∆Go = – n F Eo ∆Go = – R T ln K
E = Eo – (0.0592/n) log(Q) ln(N/No) = – kt or ln N = ln No – k t 0.693 = k t1/2 J = C V A=C/s
1) The oxidation number of phosphorus in PO4
3- is and ox nu of P in P4 is
2) The oxidation number of nitrogen in NH3 is and ox nu of U in UF6 is
3) By simple inspection balance the combustion reaction of methanol below and write final equation
with no fractions
CH3OH + O2 CO2 + H2O
4) Using the reaction CrO4
2- + S2- S + CrO2
- write two half reactions with electrons
5) Now balance by first combining the two half reactions above appropriately and then adding OH- and
H2O as needed assuming that this reaction takes place in a basic aqueous solution
Document Summary
Chem 122 rybolt exam 3 spring 2009 name______________________________________ Other needed information is given in the problem or written on the board or found in the periodic tables you will use during exam. For numerical problems, be sure to show your work, include units and circle your final answer. If several choices are given, circle the one correct answer. Your written answers should be brief and to the point. You can use only your own calculator on the exam, but no notes, books, external information, or other electronic devices are to be used. No cell phone is to be used in exam room. 1 cal = 4. 184 j c = 3. 00 x 108 m/s 1 atm = 760 torr = 1. 01x105 n/m2 h = 6. 63 x 10-34js. R = 0. 08206 (l atm/ mol k) r=8. 31 j/mol k (k) = (oc) + 273 (oc) = ( of - 32 ) / 1. 8.
