Plot on the same energy diagram having the vacuum as zero:

(A) the absolute electrochemical potentials, under standard conditions, of the following reactions: (i) H+/H2, (ii) O2/H2O (pH = 1). What is the spontaneous direction of reactions (i) and (ii) if reaction (i) occurs by electron exchange with the conduction band while reaction (ii) occurs by electron exchange with the valence band? Under such conditions, which of the two semiconductors can achieve water splitting (2H2O ® 2H2 + O2)?

(B) The position of the band gaps of the compound semiconductors SrTiO3 and Fe2O3

SrTiO3: band gap is 3.2 eV, conduction band edge = -3.8 eV, valence band edge = -
6.9 eV. Fe2O3: band gap is 2.2 eV, conduction band edge = -4.8 eV, valence band edge =
-6.9.

Calculate the ratio of the packing factors for the following cases: 1) simple cubic to face centered cubic. 2) simple cubic to hypothetical face centered body centered cubic crystal (i.e. a face centered cubic with a similar atom placed in the center 3) simple cubic to a simple hexagonal unit cell (hint: think about the hexagonal unit cell that can be made by deforming a simple cube) 4) a simple cubic crystal that has a central impurity atom that fills the interstitial space to a simple cubic crystal that has a central simple cubic structure in the interstitial space.

What is the chemical reaction equation when Vermiculite comes in contact with soil?

For the peptide below

Thr, Ser, Tyr, Met, Asp, Phe, His, Lys, Trp, Gly, Pro, Arg, Ile, Glu

Calculate overall charge for pH=5 and pH=11 Calculate overall pI

the decomposition of amonia is shown below. if kp is 1.5x10³ at 400 C, what is the partial pressure of amonia when the partial pressure of H₂ is 0.15 atm and N₂ is 0.10 atm at equilibrium?

2 NH3(g)<____> N2 (g) + 3 H2 (g)

The correct answer is 4.47x10^-4 atm please and thank you

Diets that severely restrict carbohydrate intake often result in ketosis for the dieter.

Explain why this occurs by selecting the correct answer.

   When he received the Nobel Prize in chemistry in 1960, Willard Libby gave a lecture about radioactive dating to the king of Sweden and assembled guests in Stockholm.
a)   It was suspected that cosmic rays from space hit the Earth. What evidence confirmed this hypothesis?

b)   What did Libby have to assume to reach the conclusion that the expected specific radioactivity of living matter would be 2.0/8.5 disintegrations per second per gram of C? What evidence was there to confirm his conclusion?
  

c)   Libby concluded that we humans are in steady state with respect to our own concentrations of carbon-14 while alive but not after death. How did he justify this conclusion?
  
d)   On what basis did Libby conclude that humans are radioactive? What evidence did he collect to test his conclusion?

And here is the link provided for answering this question: http://www.nobelprize.org/nobel_prizes/chemistry/laureates/1960/libby-lecture.pdf

A 100.0 −mL buffer solution is 0.110 M in NH3 and 0.125 M in NH4Br.

A. If the same volume of the buffer were 0.260 M in NH3 and 0.395 M in NH4Br, what mass of HCl could be handled before the pH fell below 9.00?

B. What mass of HCl could this buffer neutralize before the pH fell below 9.00?

Why does the primary structure impact all levels of protein structure? What is unique about the peptide bond that directly impacts protein structure? What intermolecular forces stabilize protein structure? Consider protein denaturation, what environmental forces can cause a protein to lose its structure? What types of interactions are they disrupting? Many proteins require chaperones to properly fold. How do chaperones help proteins fold? What potential problems might arise from a misfolded protein? (An example from the text may be useful but is not required.)

In a buffer solution prepared from 10 mL of 3.0 M benzoic acid (HC₆H₅CO₂) added to 20 mL of a 2.0 M sodium benzoate (NaC₆H₅CO₂) and diluted to a total volume of 200mL- Calculate each of the following:

a. The original pH of the buffer solution

b. The pH upon addition of 8.0 mL of 2.0 M NaOH to part a

c. The pH upon addition of 30.0 mL of 2.0 M HCl to part a

In a buffer solution prepared from 10 mL of 3.0 M Pyridine (C₅H₅N) added to 20 mL of 2.0 M Pyridine Hydrochloride (C₅H₅NHCl) and diluted to a total volume of 200 mL- Calculate each of the following:

a. The original pH of the buffer solution

b. The pH upon addition of 25.0 mL of 2.0 M NaOH to part a

c. The pH upon addition of 10.0 mL of 2.0 M HCl to part b

1. For KNO₃ the heat of solution is 23.8 kJ/mol and the lattice energy is -685.0 kJ/mol. Calculate the heat of hydration.

2. 60.3 g of zinc sulfate [ZnSO₄], is added to 160. g of water. Will the salt dissolve completely and, if so, will the solution be saturated or unsaturated? The solubility of ZnSO₄ is 3.57 m.

3. What volume of water, in mL, is needed to dissolve 2.2 mg of hydrogen gas when the partial pressure of hydrogen above the water is 2.2 atm at 25 °C? The Henry's constant for hydrogen gas in water at 25 °C is 7.8×10^-4 M/atm.

PLEASE ANSWER ALL 3 QUESTIONS.

Answer the following and express your answer using two significant figures.

Calculate the final concentration of each of the following diluted solutions.

A) 3.5 L of a 4.0 M HNO3 solution is added to water so that the final volume is 8.0 L .

B) Water is added to 0.15 L of a 6.0 M KOH solution to make 2.0 L of a diluted KOH solution.

C) A 35.0 mL sample of 8.0 % (m/v) NaOH is diluted with water so that the final volume is 200.0 mL .

D) A 6.0 mL sample of 50.0 % (m/v) acetic acid (HC2H3O2) solution is added to water to give a final volume of 25 mL .

A sample that contains only BaCO3 and MnCO3 weighs 0.8192 g. When it is dissolved in excess acid, 0.2420 g of carbon dioxide is liberated. What percentage of BaCO3 did the sample contain? Assume all the carbon originally present is converted to carbon dioxide.