Why can the Drude equation not be applied in the range of wavelengths near maximum absorbance?

An antifreeze protein, with a molecular weight of 17000 Da, was found to be present at a concentration of 10g dm-3 in the serum of an Antarctic fish. calculate the expected depression of the freezing point and compare your result with 1) the observed depression of 0.6K and 2) the depression of 0.0014K observed for 10g dm-3 solution of lysozyme, molecular weight of 14500 Da. for pure water, Lf=6.02kj ml-1 and Tm=273.15 K

A) how many grams of Zinc (II) Nitrate would be required to produce 350 ml of a .50 M solution?

Water is Unusual because...(Choose All true)

- soilid phase is less compact than the liquid phase.

-Most molecules as small as water are gases at room temperature

-most molecules as small as water have higher boiling points than water does

-its very strong hydrogen bonding and polarity (among other things) give it unusual properties

25.0 mL of a 1.00 M Fe(No3)2 solution was reacted with 25.0 mL of a 0.700M solution of K3PO4 to produce the solid Fe3(PO4)2 by the balanced chemical equation

3 Fe(NO3)2(aq)+ 2 K3PO4(aq)--->Fe3(PO4)2(s)+ 6 KNO3(aq)

What is the limiting reagent?

How many grams of Fe(PO4)2 will be produced?

3a. Consider the reaction when aqueous solutions of chromium(II) nitrate and barium iodide are combined. The net ionic equation for this reaction is:

3b. Consider the reaction when aqueous solutions of zinc sulfate and iron(III) acetate are combined. The net ionic equation for this reaction is:

3c. Consider the reaction when aqueous solutions of sodium nitrate and barium hydroxide are combined.

The net ionic equation for this reaction is:

3d. Consider the reaction when aqueous solutions of sodium hydroxide and potassium acetate are combined.

The net ionic equation for this reaction is:

3e. Consider the reaction when aqueous solutions of potassium iodide and ammonium carbonate are combined.The net ionic equation for this reaction is:

3f. Consider the reaction when aqueous solutions of magnesium sulfate and sodium phosphate are combined. The net ionic equation for this reaction is:

3g. Consider the reaction when aqueous solutions of barium nitrate and sodium sulfide are combined.The net ionic equation for this reaction is:

3h.Consider the reaction when aqueous solutions of ammonium sulfide and barium acetate are combined. The net ionic equation for this reaction is:

3i. Consider the reaction when aqueous solutions of iron(III) iodide and sodium phosphate are combined. The net ionic equation for this reaction is:

3j. Consider the reaction when aqueous solutions of lead(II) acetate and barium hydroxide are combined. The net ionic equation for this reaction is:

Answer all parts please! :)

Sketch the d-orbital splitting for [Ru(bpy)₃]²⁺, and populate it with electrons.

From part c (and consulting an appropriate Tanabe-Sugano diagram), how many d-d transitions are spin-allowed? List them.

Sketch the excited-state d-orbital splitting.

What is the ground-state term symbol for [Ru(bpy)₃]²⁺?

Would you expect to see a Jahn-Teller distortion? Explain.

Identify the hybridization of each interior atom of CCl☰C-CH3?

In order to separate the two dyes bound the column a solution is needed with a substance that has higher affinity for the column than the dyes. Isopropyl alcohol is such a substance. If a solution of water with 70% isopropyl alcohol is applied all the purple dye elutes (comes off) the column and the dyes do not separate. In fact this is how students clean the column before reuse of the column. Read your protocol and write down the other two concentrations of isopropyl alcohol here. Why are we using two different concentrations of isopropyl alcohol?

a) How many moles of Cu are there in 35.7 grams of Cu?

b) How many MOLES of dinitrogen tetrafluoride are present in 3.33 grams of this compound ?

c) How many ATOMS of nitrogen are present in 3.29 grams of dinitrogen tetrafluoride ?  atoms of nitrogen .

d) How many GRAMS of fluorine are present in 6.41×1022 molecules of dinitrogen tetrafluoride ?  

e) How many GRAMS of dinitrogen tetrafluoride are present in 1.98 moles of this compound ?   

A certain volatile hydrocarbon (a binary compound of carbon and hydrogen) is found to be 92.3% carbon by mass. In a seperate experiment, utilizing the Dumas method, a 4.00 mL pure liquid sample of this hydrocarbon is vaporized in a 125 mL Florence flask when the barometric pressure is 768.0 torr. After the exess gas escapes the temperature is measures as 98.0 C. The flask and contents are subsequenlty cooled to 25 C (densitry water at 25 C = 0.997044 g/mL ) and the vapor condenses to a liquid. The flask is then empetied cleaned and filled with water. When weighed on the balance, the difference in weight between the flask filled to the brim with water and the dry empty flask at 25 C is 128.12 g

The empty flask - fitted with a foil cap pierced with a pinhole - weighs 25.3478g

The weight of the flask and contents is found to be 25.6803g

Determine the Emperical formula, the volume that the vapor occupied in the Florence flask and the molecular formula of this hydrocarbon.

a) Calculate the change in pH when 5.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). b) Calculate the change in pH when 5.00 mL of 0.100 M NaOH(aq) is added to the original buffer solution.

What is entropy (no measure of disorder, please)? How was it introduced in science? What is its significance in chemistry?

Why do molecules absorb light? Why are only certain wavelengths absorbed?

One mole each of CO 2 , O 2 , and N 2 are fed to a batch reactor and heated to 3000 K and 5.0 atm.

Two reactions as shown proceed to equilibrium

CO 2<-----> CO + ½ O 2 K p1 = 0.3272 atm 1/2

½ N 2 + ½ O 2 <-------> NO, K p2 = 0.1222

Calculate the equilibrium composition of the reactor content. [CO 2 = 25.74 mole%; CO = 4.50

mole%; O 2 = 33.55 mole%; N 2 = 30.30 mole%; NO = 3.90 mole%]

For benzene, the total π-electron energy is E_π = 6α + 8β and for 1,3,5-hexatriene it is E_π = 6α + 6.99β.

(a) Using Huckel molecular orbital theory, compare the total π-electron energy of 1,3,5-hexatriene to the energy of a molecule with 3 localized π-bonds (i.e. 3 ethene molecules). What factor leads to the lower energy of 1,3,5-hexatriene as compared to the molecule with 3 localized π-bonds? Explain.

(b) Explain why the total π-electron energies of benzene and 1,3,5-hexatriene are different even though both have 6 carbons and 6 π-electrons. Why does benzene have a lower energy? Explain.