How might you use IR spectroscopy to determine whether the reaction is really complete after 35-40 min?  

how do we use a catalyst to make one enantiomer of a molecule?

Iodine-131 is an isotope of iodine (Z = 53) used for the treatment of hyperthyroidism, as it is readily absorbed into the cells of the thyroid gland. With a half-life of 8 days, it decays into an excited Xenon-131 atom (Z = 54).

1.What type of radioactive decay occurs in this process?

a. alpha decay

b. electron capture

c. gamma decay

d. beta decay

2. The related isotope iodine-125 is used in brachytherapy. In what way does it differ from iodine-131?

a. The number of beta particles

b.The number of neutrons

c.The number of electrons

d.A different number of protons

3.Which of the following is a true statement regarding the atomic mass during the decay from iodine-131 to xenon-131?

a. We expect the mass has decreased because xenon-131 has one less proton

b. We expect the mass has decreased because xenon-131 has one more proton.

c. We expect the mass has increased because xenon-131 has an extra proton.

d. We expect the mass has increased because xenon-131 has one less proton

4. What percentage of an iodine-131 sample remains after 44 days?

a. 50%

b. 88%

c. 2.2%

d. 3.1%

5. The SI unit for activity (decays per second) is the Becquerel (Bq). A hospital receives a shipment of iodine-131 with an activity of 8 × 1010 Bq. After 16 days, there are several patients that need to be given doses of 1 × 109 Bq each. How many patients can be treated?

a. 10 patients

b. 20 patients

c. 40 patients

d. 80 patients

What is Plato’s argument for a bipartite division of the soul? How does this relate to freedom? Distinguish rational and sense ‘appetites’ by their different ‘objects’. What is the relation between cognition and desire?

Describe the nature of the interactions in a solution with positive DSexcess , DS excess negative , DG positive excess DG , DG negative excess, excess DH greater than zero and excess DH less than zero excess.

A first-order decomposition reaction is observed to have the following rate constants at the
indicated temperatures. Estimate the activation energy and the frequency factor. Include
any important plots.

From your results, calculate ∆S‡, ∆H‡, and ∆G‡ at each temperature.

a)The equilibrium constant, Ka, for the reaction given below is is 6.0 x 10-3. Calculate the pH of a 0.798 M solution of Fe(H20)63+.

Fe(H20)63+(aq) + H2O(l) <--> Fe(H20)5OH2+(aq) + H3O+(aq)

b)Calculate the pH necessary for 97.4 % of the iron(III) to be in the form Fe(H20)₆³⁺

Consider how a star like the Sun changes after the Main Sequence. Put the following events in the correct order.

1. The outer layers of the star drift off into space creating a planetary nebula.

2. Helium fusion in the core of the star ends

3. The hot, dense core of the star is left behind as a white dward that slowly cools and dims over time.

4. The star shrinks slightly, compressing a shell of hydrogen surrounding the non-burning helium core.

5. The shell surrounding the non-burning carbon/oxygen core begins to fuse helium, and the shell outside of that fuses hydrogen.

6. The star's core becomes hot enough and dense enough to begin fusing helium to carbon and oxygen, causing it to collapse inward somewhat.

7. Shell hydrogen fusion is disrupted and the star shrinks slightly

8. Fusion of hydrogen to helium in the core of the star ends.

9. The star shrinks slightly, compressing a shell of helium surrounding the non-burning carbon/oxygen core, and a shell of hydrogen surrounding the region of helium

10. The star's surface becomes cooler and the star's luminosity increases; the star is now a "red giant."

11.Hydrogen shell fusion causes the outer layers of the star to expand outward.

12. The star's surface becomes cooler and the star's luminosity increases; the star is now an "asymptomatic giant."

13. Shell fusion of hydrogen and helium cause the outer layers of the star to expand outward.

14. The shell surrounding the non-burning helium core begins to fuse hydrogen

15. The star's surface becomes somewhat hotter and the star's luminosity decreases slightly; the star is now a "horizontal branch" star

1. A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.4862 g the mass barely changed, dropping to 0.4855 g. When the product was converted to a chloride, the mass went up, to 0.5247 g.

a. Is the sample a carbonate? NO

b. What are the two compounds that might be in the unknown? KHCO3 and NaHCO3

c. Write the chemical equation for the overall reaction that would occur when the original compound was converted to a chloride. If the compound is a hydrogen carbonate, use the sum of Reactions 1 and 2. If the sample is a carbonate, use Reaction 2. Write the equation for a sodium salt and then for a potassium salt.

d. How many moles of the chloride salt would be produced from one mole of original compound? _____

e. How many grams of the chloride salt would be produced from one molar mass of original compound? Molar masses: NaHCO3 84.008 g Na2CO3 105.99 g NaCl 58.44 g KHCO3 100.118 g K2CO3 138.21 g KCl 74.55 g

If a sodium salt, ____________ g original compound → ____________ g chloride I

f a potassium salt, ____________ g original compound → ____________ g chloride

f. What is the theoretical value of Q, if she has an Na salt? ____________ if she has a K salt? ____________

g. What was the observed value of Q? ____________

h. Which compound did she have as an unknown?

I have bolded my own answers. I need help with the rest, please show work!

State the condition(s) under which the following equations can be applied: (a) ?S = ?H / T , (b) S(T = 0) = 0 , (c) dS = CpdT / T , (d) dS = dq / T

Find information on:
1. albuterol
2. warfarin
3. morphine
4. chlorophyll a
To get full credit (4 pts) you must:
1. Give molecular formula and structure
2. Propose a reaction (1 rxn) that could synthesize the molecule from a
closely related structure (i.e., work backward 1 step).
3. Propose a reaction (1 rxn) that could transform the molecule into a
new compound.
4. Identify the molecule’s importance and/or application

A Lab question asks whether the relationship between atomic number and electronegativity is direct, log, or inverse. I am inclined to say that it is direct since electronegativity increases with atomic number; though my out of my various graphs, the one graphing atomic number vs. log of electronegativity has the best line of fit (highest R^2) so I want to say it has a log relationship. Is this correct?

A 0.4485 g sample of pewter, containing tin, lead, copper, and zinc, was dissolved in acid. Tin was precipitated as SnO2·4H2O and removed by filtration. The resulting filtrate and washings were diluted to a total volume of 250.0 mL. A 15.00 mL aliquot of this solution was buffered, and titration of the lead, copper, and zinc in solution required 34.07 mL of 0.001534 M EDTA. Thiosulfate was used to mask the copper in a second 20.00 mL aliquot. Titration of the lead and zinc in this aliquot required 34.56 mL of the EDTA solution. Finally, cyanide was used to mask the copper and the zinc in a third 25.00 mL aliquot. Titration of the lead in this aliquot required 25.76 mL of the EDTA solution. Determine the percent composition by mass of each metal in the pewter sample.

Cu%=

Zn%=

Pb%=

Sn%=