EXAM PROBLEM #4 Instructions:  Answer the questions below for the molecule shown here.  There is no need to write anything on your “work” pages, but you can if that helps you. Choose your answers from the dropdown boxes. Molecule:   Questions: A.  Overall molecule: How many central atoms are in this molecule?  [central] How many sigma bonds are in this molecule, in total?  [sigma] How many pi bonds are in this molecule, in total?  [pi] B.  For the O1 atom: What type of hybrid orbital is it using for its sigma bonds?  [orbital1] What is the bond angle around the atom?  [angle1] What is the name of the molecular geometry for this atom?  [geometry1] C.  For the N2 atom: What type of hybrid orbital is it using for its sigma bonds?  [orbital2] What is the bond angle around the atom?  [angle2] What is the name of the molecular geometry for this atom?  [geometry2] D.  For the C3 atom: What type of hybrid orbital is it using for its sigma bonds?  [orbital3] What is the bond angle around the atom?  [angle3] What is the name of the molecular geometry for this atom?  [geometry3]

EXAM PROBLEM #8 Instructions:  Solve this problem using only dimensional analysis. Type your answer to the question in the textbox below.  Show all work on your “work” page.  Identify which problem it is:  #8 Question: A solution is 21.4% (v/v) Br2 and has a density of 1.18 g/mL.  What mass of this solution is needed to have 86.5 mL of Br2?      

EXAM PROBLEM #3 Instructions:  (1)  On your “work” page, draw the Lewis structure for HNO2.  Include all equivalent resonance structures, as appropriate. Label which problem it is:  #3 (2)  Type the total number of valence electrons in the textbox below.   Show this calculation either in the textbox here or on your “work” page.

EXAM PROBLEM #7 Instructions:  Type your answer to the question in the textbox below.  Show all work on your “work” page.  Identify which problem it is:  #7 Question: A student needs 130.0  mL of a 0.876 M KOH solution. What volume of 6.25 M KOH solution is needed to prepare this new solution?  

EXAM PROBLEM #1 Instructions: In the textbox below, for each compound, type in: What type of compound it is (acid, ionic compound, molecular compound) AND the formula of the compound using the naming rules from this class. Use the T2 button to format subscripts.  Remember to turn it on and then turn it off. Label your answers A, B, C. There is no need to write anything on your “work” pages, but you can if that helps you. Compounds: A.  aluminum periodate B.  phosphoric acid C.  mercury(II) carbonate

EXAM PROBLEM #8 Instructions:  Solve this problem using only dimensional analysis. Type your answer to the question in the textbox below.  Show all work on your “work” page.  Identify which problem it is:  #8 Question: A solution is 21.4% (v/v) Br2 and has a density of 1.18 g/mL.  What mass of this solution is needed to have 86.5 mL of Br2?      

A NET increase means that after a process occurs there is an increase in the amount of a compound beyond the amount at the start of the process.  Oxidizing the acetate of acetyl-CoA in the citric acid cycle does NOT result in a net increase in: 

For the reaction A –> B with starting concentrations of [A] at 1 M and [B] at 100 M (NOT standard conditions), the ACTUAL free energy change (

The free energy change (

For the reaction A –> B with starting concentrations of [A] at 1 M and [B] at 100 M (NOT standard conditions), the ACTUAL free energy change (