4)Calculate the E_cell of: Al(s) + Cu²⁺(aq)(0.010M) → Al³⁺(aq)(1.0M) + Cu(s) (is this balanced?)

A. 2.06 B. 1.94 C. -2.06

5)Calculate the E^ocell for: Fe(s) + Br₂(g) →   Fe²⁺(aq) +Br^-(aq) ; is this electrolytic or voltaic?

A.-1.52V ; voltaic B.1.52V ; electrolytic C.1.52V ; voltaic D.-1.52V ; electrolytic

6)Calculate the E_cell of: Au(s) ; Au³⁺(aq) // Sn²⁺(aq) ; Sn(s)    is this electrolytic or voltaic?

A.1.64 ; electrolytic B.1.64 ; voltaic C.-1.64 ; voltaic D.-1.64 ; electrolytic

Identify the most likely transition metal M:

a)   K3[M(CN)6], in which M is a first-series transition metal and the complex has 3 unpaired electrons.

b)   [M(H2O)6]3+, in which M is a second-series transition metal and LFSE = –2.4 Do.

c)   Tetrahedral [MCl4]–, which has 5 unpaired electrons and M is a first-series transition metal.

d)   Square planar [MCl2(NH3)2], in which M is a d8 third-series transition metal.

1. Much like the CO ligands, cyanide (CN^-) ligands have IR stretching frequencies that are distinctive and therefore often particularly useful. Consult an appropriate character table, and give a reducible representation for the cyanide stretching vibrations in the square-planar tetracyanoplatinate(II) ion, Pt(CN)₄^2-.

1. For the following molecules (with their principal rotational axis defined as the z axis), Give the following information: (a) The total degrees of freedom, (b) The reducible representation for the motions of the molecule, (c) The list of irreducible representations (by their symmetry labels) for the motions of the molecule, (d) The list of irreducible representations corresponding to translations, (e) The list of irreducible representations corresponding to rotations, (f) The list of irreducible representations corresponding to any IR-active vibrational modes, and (g) The list of irreducible representations corresponding to any Raman-active vibrational modes.
   1. water
   2. trans-1,2-dichloroethene
   3. ethene

(1) Show with the aid of diagrams the action of each of the following symmetry operations on a point located at (x, y, z). C4 S4 {2 marks}

(2) With reference to a set of character tables, determine the order of each of the following point groups. D2d Oh {2 marks}

(3) Determine the total degeneracy of each of the following irreducible representations ().  = 3Ag + B1u + 2B2u  = A1g + 3Eg + 2T1g + T2u {2 marks}

(4) For each of the following species, sketch the molecule or ion and determine its point group using the flow chart available on Blackboard. In order to secure full marks, you are required to show your answers to each of the questions in the flow chart for each molecule or ion. IF4 + ClF2 + AsF5 N2O4 O3 CS2 trans-[PCl4F2] {7 ×1 mark}

(5) IF5 is square pyramidal (point group C4v). By constructing a suitable basis, corresponding to the I-F stretching vibrations only:

(i) Determine the reducible representation (I-F) for the I-F bond stretching vibrations in IF5. {3 marks}

(ii) Using the reduction formula together with the character table for Td available on blackboard, reduce this representation to its irreducible form. {3 marks} Question continues on next page

(iii) By reference to the character table for Td, determine which of these vibrations are (a) infrared active (b) Raman active. Give reasons for your answer.

Write a detailed procedure for converting a chemical formula into a Lewis structure and how to determine the shape, and polarity from this Lewis structure.Write a detailed procedure in your own words for converting a chemical formula into a Lewis structure and how to determine the shape, and polarity from this Lewis structure.

A compound of chlorine and fluorine, ClF_n, reacts at about 75?C with uranium metal to produce uranium hexafluoride, UF₆, and chlorine monofluoride, ClF (g). A quantity of uranium produced 3.53g UF₆ and 343 mL ClF at 75?C and 2.50 atm. What is the formula (n) of the compound?_____________

Describe the bonding in the molecule, using valence bond theory.

(a) In the cracking of dicyclopentadiene (BP = 1700C), why is important to correctly adjust the heater temperature so that the thermometer reading stays as close as possible to 410C? (b) If the temperature abruptly increases to 650C, can the distillate that has been already collected still be used in the Diels-Alder reaction with maleic anhydride? Explain your answer.

For the diprotic weak acid H2A, Ka1 = 3.0 × 10^-6 and Ka2 = 7.6 × 10^-9. What is the pH of a 0.0600 M solution of H2A? What are the equilibrium concentrations of H2A and A2– in this solution?

pH=?

[H2A]=?

[A2-]=?

A gas composed of methane and ethane has a specific gravity of 0.75. What is the weight percent and volume percent of the methane in the mixture?

Balanced redox equation: MnO₄^1- + 8H¹⁺ + 5Fe²⁺ → 5Fe³⁺ + Mn²⁺ + 4H₂O

Calculate the average concentration of KMnO₄ titrant using M₁xV₁xE₁ = M₂ xV₂ xE₂

Average Molarity of MnO₄^1-                                           __________

In general, rain water is more acidic than surface water due to the properties of sulfur oxides in the air which differ from those of CO₂. State ONE property of SO₂ which cause increased acidity of rain water relative to CO₂-containing surface water.  

Which of the following is true about amino acids with isoelectric point around pH 10?

a. the side chain must be acidic

b. the side chain must be basoc

c.the side chain must be polar

d. the side chain must be non polar

e. none of these

Consider the chemical equation 2NH3 ? N2 + 3H2. the equilibrium is to be established in a 1 liter container at 1,000 K, where Kc= 4.0*^-2. Initially1,220 moles of NH3 are present. Estimate equilibrium concentration of H2.

A 2.250×10⁻² M solution of NaCl in water is at 20.0∘C. The sample was created by dissolving a sample of NaCl in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 999.4 mL . The density of water at 20.0∘C is 0.9982 g/mL.

A. Calculate the molality of the salt solution.

Express your answer to four significant figures and include the appropriate units.

B. Calculate the mole fraction of salt in this solution.

Express the mole fraction to four significant figures.

C. Calculate the concentration of the salt solution in percent by mass.

Express your answer to four significant figures and include the appropriate units.

D. Calculate the concentration of the salt solution in parts per million.

Express your answer as an integer to four significant figures and include the appropriate units.