While OLEDS are useful, sometimes they can be hard to convert to regular devices.

1)Are OLED's more or less robust than inorganic LEDS and why?

2) If a defect, for example a disruption in the conjugation of a polymer occurred, how would this change the light emitting properties of the material?

3) If lemon juice was spilled on your phone (aq citric acid) Draw the repeating unit of PPV and the mechanism of this species with aqueous acid. Would a defect occur? How likely is the reaction and name a common species in everyday life that can react with systems such as these.

If a solution containing 17.91 g17.91 g of mercury(II) perchlorate is allowed to react completely with a solution containing 5.102 g5.102 g of sodium dichromate, how many grams of solid precipitate will be formed?

mass:

gg

How many grams of the reactant in excess will remain after the reaction?

mass:

gg

Assuming complete precipitation, how many moles of each ion remain in solution? If an ion is no longer in solution, enter a zero (0) for the number of moles.

Hg2+Hg2+:

molmol

ClO–4ClO4–:

molmol

Na+Na+:

molmol

Cr2O2−7Cr2O72−:

mol

Explain the strengthening mechanism in the large particle and dispersion strengthen composites with their differences.

One can argue that both nitric oxide and sulfur dioxide are natural, and hence, harmless. Would you agree or disagree with this statement? Explain using the concept of equilibrium and biogeochemical cycles, and discuss their effects on natural waters.

Describe how you would design the experiment, what you would measure, and how you could determine the specific heat capacity of water.

For a solution of Ni2+ and ethylenediamine, the following equilibrium constants apply at 20° C: Ni2+ + H2NCH2CH2NH2 <-> Ni(en)2+ log K1 = 7.52 Ni(en)2+ + en <-> Ni(en)22+ log K2 = 6.32 Ni(en)22+ + en <-> Ni(en)32+ log K2 = 4.49 Calculate the concentration of free Ni2+ in a solution prepared by mixing 0.100 mol of en plus 1.00 mL of 0.010 M Ni2+ and diluting to 1.00 L with dilute base (which keeps all the en in its unprotonated form. [Hint: Assume that nearly all the Ni is in the form Ni(en)32+ (i.e., [Ni(en)32+] = 1.00 x 10-5 M).] You will need to calculate the concentrations of Ni(en)2+ and Ni(en)22+ to verify the assumption does not lead to a contradiction.

a. Compare the interactions of protons/alpha particles to electrons with absorber materials? What properties are factors in slowing down and ultimately stopping these particles?

b. Do you expect neutrons to slow down as a result of the same interactions? What type of material do you think could be used to slow down a neutron? Why? Hint: In a nuclear reactor, neutrons produced in the fuel are slowed down in the water. Think about why water is effective at slowing down the neutrons.

1. Define Le Chatelier’s Principle in your own words:
2. If concentration of a reactant is increased, explain which way (and why) the equilibrium will shift
3. If product is removed from a reaction at equilibrium, it will cause a shift in which direction? Why?
4. If the temperature of an endothermic reaction is raised, what will be the effect on equilibrium? Explain.
5. If the temperature of an exothermic reaction is decreased, what will be the effect on equilibrium? Explain.  

How many lysine residues become aldehydes in the Schiff base crosslink?

How many hydrogen atoms are on a proline nitrogen atom at pH = 7 when the proline nitrogen forms a pepetde bond with another amino acid?

What fraction of the amino acids in the collagen peptide are glycine?

Calculate the pH of a polyprotic acid give and sketch the titration curve for the following reaction: A 10.0-mL aliquot of 0.100M Na3AsO4 titrated with 0.100M HCl. pK1 = 2.25, pK2 = 6.77, pK3 = 11.60.

The differential for the Internal energy, U, at constant composition is
?U = −P?V + T?S
(a) What are the natural independent variables of U? [2]
(b) Derive an expression for the change in internal energy at constant Volume starting with the
above differential for the internal function, U, at constant composition. [3]
(c) Using the criterion for exact differentials, write the Maxwell relation that is derived from this
equation. [2]
(d) Based on your answer in part (a), write the total differential of U in terms of partial
differentials. [2]
(e) By comparison of the above equation (equation at the beginning of the question) and the total
differential of U written in part (d), obtain appropriate expressions (partial differentials) for −P
and T.

Saccharin, an artificial sweetener that is 300 times sweeter than sugar, is composed of 45.9% carbon, 2.73% hydrogen, 26.23% oxygen, 7.65% nitrogen, and 17.49% sulfur. Each packet of Sweet

The reaction SO2Cl21g2 ¡ SO21g2 Cl21g2 is first order
in SO2Cl2. Using the following kinetic data, determine the
magnitude and units of the first-order rate constant:

Time Pressure
0 1.000
2500 0.947
5000 0.895
7500 0.848
10000 0.803

k=