This Is Your Reference Sheet/Scratch Paper

EXAM I - THIS IS YOUR REFERENCE SHEET/SCRATCH PAPER

Planck’s Constant = 6.63 x 10-34 J Sec Speed of light = 3.00 x 108 Rydberg constant = 2.18 x 10-18 J

Chemistry 112 Fall 2013 CLS Name______EXAM I

Chemistry 112 Fall 2013 CLS Name______EXAM I ______Show all your work. There are 9 Pages to this exam including the reference sheet and cover sheet

(40 points) 1. SHORT ANSWER/MULTIPLE CHOICE (1) Give the Orbital Diagram for a Sn(IV) ion.

(2) Write the set of quantum numbers for each electron lost when Cuo forms a Cu(II) ion.

(3) Atoms only emit certain wavelengths of light when they are excited. This describes the ______

Theory. In which the energy of photons is said to be______.

(4) Write an orbital diagram that violates only Pauli Exclusion Theorem

FOR THE FOLLOWING MULTIPLE CHOICE QUESTIONS, CIRCLE THE CORRECT ANSWER (5) How many different values of ml = in the 5f sublevel? a. 1 b. 7 c. 4 d. 6 e. 2

(6) Which of the following is diamagnetic a. Sn(II) b. I c. N d. Cr e. None of the above are diamagnetic

(7) Each of the following sets of quantum numbers is supposed to specify an orbital. Choose the one set of quantum numbers that does not contain an error. a. n = 4, l = 0, ml =-1 b. n = 4, l = 4, ml =0 c. n = 5, l = 3, ml =-3 d. n = 3, l = 1, ml = -2 e. n = 3, l = 2, ml =+3

(8) Determine the end (final) value of n in a hydrogen atom transition, if the electron starts in n=4 and the atom emits a photon of light with a wavelength of 486 nm.

a. 1 b. 4 c. 2 d. 5 e. 3

(9) Use the standard reaction enthalpies given below to determine ΔH°rxn for the following reaction:

2 S(s) + 3 O2(g) → 2 SO3(g) ΔH°rxn = ?

Given: SO2(g) → S(s) + O2(g) ΔH°rxn = +296.8 kJ

2 SO2(g) + O2(g) → 2 SO3(g) ΔH°rxn = -197.8 kJ

a. -791.4 kJ b. 1583 kJ c. -692.4 kJ d. -293.0 kJ e. -494.6 kJ

(10) Which of the following processes have a ΔS < 0? a. water freezes b. methanol (g, at 555 K) → methanol (g, at 400 K) c. isopropyl alcohol condenses d. carbon dioxide (g) → carbon dioxide (s) e. All of the above processes have a ΔS < 0.

(11) Which of the following is the strongest reducing agent?

a. Zn(s) b. Mg(s) c. Mg2+(aq) d. Al(s)

e. Al3+(aq)

(12) The electrolysis of molten AlCl3 for 2.00 hr with an electrical current of 12.0 A produces ______g of aluminum metal.

a. 72.5 g b. 0.298 g c. 24.2 g

d. 2.24 × 10-3 g e. 8.06 g

(13) How many orbitals are contained in the third principal level (n = 3) of a given atom?

a. 3 b. 7 c. 9 d. 5 e. 18

(12 pts) 2]. Calculate Δ G for a galvanic cell at standard conditions from following half-reactions:

- 2- S2O8 + 2e ⇄ 2SO4 E° = 2.01 V - + - 2+ MnO4 + 8 H + 5e ⇄ Mn + 4H2O E° = 1.49 V

(12 points) 3] Calculate the emf for the following cell at 25oC:

- Pt| Fe(NO3)2 (1.00 M) | Fe(NO3)3 (0.010 M)|| Cl2 (1.5 atm) | Cl ((0.050M) | Pt

(12 points) 4] For the following cell:

Calculate the pH if the cell potential is 0.45 V

- 2+ 3+ The [NO3 ]= 0.10 M [Fe ]= 0.30 M PNO = 1.2 atm [Fe ] = 0.15 M

- + 2+ 3+ NO3 + 4H + 3Fe ⇄ NO + 2H2O + 3Fe

19 (10 points) 5] Calculate the Eo for the following reaction if Keq = 1.00 x 10 : - - + I2 + 5Br2 + 6H2O ⇄ 2IO3 + 10Br + 12H

(15 points) 6] For the diagram shown below: a. Calculate the potential for the cell below

b) Is this a galvanic or electrolytic cell?

c) Draw the picture of the above cell (1) showing the location of each species (2) all components of the cell (3) flow of electrons (4) write the half-rxn to each beaker (5) show the flow of electrons (6) label the cathode and anodes (7) label the oxidation and reduction rxns (8) label the positive and negative electrodes

Zno Zno

0.33 M Zn(NO3)2 3.45 M Zn(NO3)2

(6 points) 7] Give and explain the experiment that showed that photons possess both particle and energy properties.