Indicate how the pKa of the ionizable group of histidine would be changed in a nonpolar pocket (increase/decrease) PLEASE EXPLAIN WHY. I thought it would increase but that's not correct

Sublimation is an example of a zero-order reaction. Provide other examples, and explain why the reactant available for reactions is unaffected by changes in the overall quantity of the reactants.

a.       Discuss which technique, simple distillation or fractional distillation, shall be the most efficient on purifying the mixture of solvents? Elaborate     (4 points)

b.      Which solvent should be distillated first, cyclohexane or Toluene? Elaborate.(3 point)

c.      How the RI measurements support (or not?) your expectations in the item b? (2.5 points)

d.      Making use of the RI measurements, explain if your distillation was successful. (3 points)

RI values:

e.       Would re-distillation of individual fractions improve the purification of individual solvents? Elaborate.                                                        (2.5 points)

A bomb calorimeter is filled with 9 atm of an unknown gaseous hydrocarbon fuel and an excess of oxygen gas at a temperature of 20.5 °C. The bomb calorimeter has a volume of 4.1 L and a heat capacity of 7.64 kJ/K. After the combustion reaction is complete the final temperature of the calorimeter is found to be 333.3 °C. Answer the following questions based on this information.

(a) What amount of heat in kJ was released from the combustion reaction of the unknown fuel? Please give your answer to 2 decimal places.

(b) What is the molar heat of combustion for the reaction in kJ/mol? Please give your answer to 2 decimal places.

(c) Given the table of data below, what is the identity of the unknown gas?

(d) What is the heat of combustion for the reaction in kJ/g? Please give your answer to 2 decimal places.

The following information is to be used for the next two questions. Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi = 5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.556-g sample was dissolved and diluted to 150.0 mL. A 25.0-mL aliquot was treated to eliminate interferences; after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution had an absorbance of 0.866 at 510 nm and 0.218 at 656 nm in a 1.00-cm cell.

a.) Calculate the concentration of cobalt (in ppm) in the initial solution prepared by dissolving the sample.

b.) Calculate the concentration of nickel (in ppm) in the initial solution prepared by dissolving the sample.

You have 0.4mL of acetic acid and 0.4mL of isoamyl alcohol for the experiment. Which is the limiting reactant?

A) What is the H_rxn^o in (kJ) for the reaction below, given the relevant table on the info sheet. PbO(s) + 2HBr(g) ---> PbBr₂(s)+H₂O(g).

a) -273

b) -229

c) -265

d) Not enough information provided.

B. What is the H_rxn^o in (kJ) for 2PbBr₂(s) + 2H₂O(g) ---> 2PbO(s) +4HBr(g) using the thermochemical equation in part A.

a) 545

b) 530

c) 458

d) 229

Which of the following is the definition of spectral interference in plasma and flame atomic emission spectrometry?

What is the ground electronic configuration of phosphorous? How many microstates does this configuration contain? Write the spin arrow diagram for phosphorus. Derive the term and state symbols. How many microstates does each state contain? Which state is the ground state?

1. If some NH4Cl is added to an aqueous solution of NH3:

   	A.	the pH of the solution will decrease
   	B.	the solution will not have pH
   	C.	NH4Cl cannot be added to NH3
   	D.	the pH of the solution will increase
   	E.	the pH of the solution will not change

Discussion about:

Nuclear Energy

There are different public opinions about using nuclear energy in producing electrical energy. Nuclear reactors are associated with harmful nuclear radiation and there is a problem of the storage of the nuclear waste. Discuss this issue from a scientific point of view giving your stand and explain why.

typing please no hand writing

An unidentified covalent molecular compound contains only carbon, hydrogen, and oxygen. When 5.00 mg of this compound is burned, 11.61 mg of CO2 and 1.27 mg of H2O are produced. The freezing point of camphor is lowered by 34.4°C when 4.705 g of the compound is dissolved in 19.25 g of camphor (Kf = 40.0°C kg/mol). What is the molecular formula of the unidentified compound? Choose appropriate coefficients in the molecular formula below.

C H O

There are two sodium acetate solutions. Their apparent concentrations are 1.00 x 10^-1 M and 1.00 x 10^-10 M, respectively. Please find the pH and true concentration (M) of acetic acid, and sodium acetate in these two solutions, respectively. The pKa of acetic acid is 4.75.

Also, can you use the same indicator for the following titration? Why? Please reason your answers with at least two criteria. (a) HCl titrated by NaOH, and (b) NaOH titrated by HCl.

Consider the following reaction and calculate the standard Gibbs Free Energy for it.

2 NO + O2 --> 2 NO2

Given that delta H= -114.1 kJ and delta S= -146.5 kJ. Also comment on the spontaneity or otherwise of this reaction at 298 K. Are there any conditions in which your answer might be different? If so state this condition