When a conductor e.g. metal or carbon is immersed in a electrolyte, electric double layer will be formed at the interface of the solid electrode and electrolyte. The equilibrium potential is related to the double-layer formed at the interface. Under the certain circumstance, the double-layer on the interface can disappear, the potential at which no double-layer is called “point of zero charge”. Please explain how it happens. (hint: the double layer is formed due to the difference of free energy between the electrode material and electrolyte. How to stop electron flow?)

A 10.0 mg sample of a nonvolatile organic compound is dissolved in 1.0 g of camphor, resulting in a depression of the freezing point of 1.33 K.

(You will be required to look some things up for this problem.)

Calculate the molar mass of the organic solute.

Calculate the vapor pressure of camphor over the solution.

how does titration of a strong monoprotic acid with a strong base differ from a titration for a weak monoprotic acid with a strong base with respect to the following a) quantity of base required to reach the equivalance point b) ph at the beginning of the titration c) ph at the equivalance point d) ph after addition of a slight access of base e) choice of indicator for determining the equivalence point

Multistep problem that I'm confused on the entire thing:

A) The addition of 5E-3 total moles of Zn2+ to a 1.0L solution of NaCN gives a solution of the complex ion [Zn(CN)₄^-2](Kf=4.2E19). What is the concentration of uncomplexed Zn²⁺ ions if the concentration of cyanide ions in the final solution is 0.5M?

B) ZnCO₃ is sparaingly soluble salt with a Ksp=1.0E-7. The addition of CN- (aq) to ZnCO₃(s) yields the complex ion [Zn(Cn)₄^2-] (aq) with the K_f mentioned before in Part A. Write the reaction.

C) What will be the Keq for this overall reaction?

D) What is the solubility of ZnCO₃ (s) in a solution of NaCN (aq) where the equilibrium concentration of cyanide in the solution is 0.2 M? Use the calculated Keq from Part C.

Explain whether acid can catalyze each of the following reactions; i.e., whether the reaction is faster at (pH lower than 7) than at pH 7:

1. Conversion of asparagine to aspartic and isoaspartic acid in peptides.

2. Conversion of aspartic acid to isoaspartic acid in peptides.

3. Cleavage of the peptide backbone at the aspartic acid residue.

The reaction of HCl with NaOH is represented by the equation

HCl(aq) + NaOH(aq) → NaCl(aq) + H₂O(l)

What volume of 0.555 M HCl is required to titrate 17.7 mL of 0.359 M NaOH?

a) 3.53 mL b) 1.80mL c) 11.4mL d) 17.7mL e)27.4 mL

In a volumetric analysis experiment, a solution of sodium oxalate (Na₂C₂O₄) in acidic solution is titrated with a solution of potassium permanganate (KMnO₄) according to the following balanced chemical equation:

2KMnO₄ (aq) + 8H₂SO₄ (aq) + 5Na₂C₂O₄ (aq) → 2MnSO₄ (aq) +8H₂O (l) +10CO₂ (g) + 5Na₂SO₄ (aq) + K₂SO₄ (aq)

What volume of 0.0388 M KMnO₄ is required to titrate 0.134 g of Na₂C₂O₄ dissolved in 20.0 mL of solution?

a) 1.38 mL b) 3.45mL c) 10.3 mL d) 25.8 mL e) 20.0 mL

In order to dilute 35.5 mL of 0.533 M HCl to 0.100 M, the volume of water that must be added is

a) 28.8 mL. b) 6.66 mL c) 189mL d) 0.00150 mL e) 154mL

The concentration of sulfate in a sample of wastewater is to be determined by using gravimetric analysis. To a 100.0-mL sample of the wastewater is added an excess of calcium nitrate, forming the insoluble calcium sulfate (MM = 136.1 g/mol) according to the balanced equation given below. The solid calcium sulfate is dried, and its mass is measured to be 0.7485 g. What was the concentration of sulfate in the original wastewater sample?

SO₄^2-(aq) + Ca(NO₃)₂(aq) → CaSO₄(s) + 2NO₃^-(aq)

a) 1.818 M b) 10.19 M c) 0.05500 M d) 18.8 M

Multiple Part Question.

For the reaction at 25C

CCL4(l) + H2(g) -> HCl(g) + CHCl3(l) Delta H°= -21.83 kcal and delta S°= 9.92 cal/K What is the delta G° for the reaction?

What is the value of Delta G in kcal mol^-1 for the reaction taking place above if pH₂ =10.0 atm and pHCL = .100 atm?

What is the equilibrium constant for the reaction described above at 25° C?

A solution containing 0.20 g of an unknown non-electrolyte in 2.50 g of cyclohexane was found to freeze at 4.5 oC . What is the molar mass of the unknown substance?

The concept of energy charge is a very useful way to think about how ATP levels control pathway activity. Discuss the role of ATP in the glycolytic pathway (between glucose and pyruvate and/or lactate) with a focus on how energy charge would alter the pathway and how the pathway activity would alter energy charge. Include both general aspects and specific ATP use and generation.

Here is a scheme describing the keto-enol tautomerization reaction. Design the catalytic site of an enzyme that would accelerate the rate of this reaction. The rate enhancement should be as great as possible. Draw the amino acids that would be involved in the reaction and the electron flow during each reaction step. Remember that the enzyme has to be regenerated at the end of catalysis.

A fuel with the composition of heptane (C7H16) is burned in an electricity-generating plant, with efficiency 36%. If the fuel has a specific energy of 26 MJ/kg, calculate CO2 emissions in units of kg/MJ electricity produced.

The minor condensation product formed by intramolecular aldol cyclization of octane-2,6-dione has a quartet absorption peak in the 1H NMR spectrum. What is its structure?