If you want to correct ONE question, you can do so here.  Type in the question # (if you’re not sure of the number, take your best guess and describe what the problem was about so I can tell) Type in your corrected answer here. Be careful! Don’t second guess and convert a correct answer to an incorrect one. If it’s a calculation problem, show your new work in the file you upload. No work, no credit for the new answer. Do NOT erase the old work that supported your original answer. Show the new work separate from the old work, or cross out with a single line cross-out so that I can still see the original work. Sorry, only ONE question can be corrected. I’ll credit only the first one if you give me more than one corrected question. If you have no corrections, you may type “NA” in the space provided, so the exam recognizes that you answered the question.

The exam consist of 10 multiple choice questions and 3 free response problems. For multiple choice questions: Choose the best answer For three free response problems: Solve all problems on a paper, scan /take picture and upload as pdf file.  *You can use your book, notes, and formula sheet during the exam* Formula Sheet

Pyrrolidine is a weak base with a Kb of 1.3×10-3.  A mixture of this base with its conjugate weak acid would make a buffer that would be most effective in the pH range of _________?

Based on what we have discussed in lecture, A. Draw on your written paper the condensed orbital diagram (arrows!) for the free ion 106Sg3+. Condensed = you must use the noble gas abbreviation. See the Periodic Table page. This will be graded manually on your written work. B. The number of unpaired electrons in Sg3+ is? Type your answer in the provided space.    

An indicator H2In is diprotic with pKInd1=5.4 and pKInd2 = 10.2. The colors of the related species are: H2In is red, HIn- is blue and In2- is yellow. What color would you expect to see if this indicator is added to a solution with a concentration of of 4.0×10-6 M?

1.6 Choose the correct answer:     Which facts, in the passage, show that something is not right with Bryan’s body? (1)

Consider the formation reaction shown using the metal Snapeium (symbol Sp) and monodentate ligand L: Sp+(aq)  + L (aq) SpL+ (aq)  A solution initially has concentrations of Sp+ = 0.10 M and L = 0.0 M. When concentrations become constant the concentration of SpL+ was found to be 0.00 M.       Calculate the formation constant, Kf. You must show work for full credit in your upload. Enter your answer in decimal form with correct sig figs. If you have difficulty in Canvas not accepting your answer, make sure it’s clearly shown in your work upload.

Let’s compare two hypothetical complexes: CoL62+ is pink (light red) and VL62+ is lavender (blue-violet). L is a neutral ligand. These two complexes have the same number of unpaired electrons.  A. On your paper, draw a labeled orbital diagram for each complex, showing the electron occupancy, labeling each d orbital. B. Based on this evidence, is CoL62+ high spin, low spin or not applicable?    C. Which complex has the largest crystal field splitting energy? Explain your answers in the work you upload.  

Pyridazine has the formula C4H4N2. A buffer is made by mixing solutions of pyridazine and pyridazinium chloride HC4H4N2Cl. Which one of the following is a correct NET IONIC equation for the reaction that occurs when a small amount of strong acid HCl is added to this buffer?  

For the following complex,  K The coordination number is The metal charge is The d electron count is d The likely geometry of the choices given is