how many grams of Al can be produced in an electrolytic cell containing a solution of aluminum chloride if a current of 10.0 A is applied for 5 hours?

For the following chemical equation:

CaCO3(s) + 2HCl(aq).......>H2)(l) +CO2 (g) +CaCl2 (aq)

A). How many liters of CO2 can form at STP when 18.5 mL of a 3.51 M HCl solution reacts with excess CaCO3?

B). What is the molarity of a HCl solution if the reaction of 210 mL of the HCl solution with excess CaCO3 produces 12.1 L of CO2 gas at 725 mmHg and 18 C?

When you mutate a Gly residue that immediately follows an alpha-helix to an Ala residue, the protein becomes less stable of 2.0 kcal/mol. Explain the molecular basis of this result.

A sample of a peptide of unknown sequence was treated with trypsin; another sample of the same peptide was treated with chymotrypsin.

The sequences (N-terminal to C-terminal) of the smaller peptides produced by trypsin digestion were as follows:

Cys—Thr—Ala—Ser—Ile—Lys

Arg—Thr—Arg—Gln—Arg

Gln—Phe—Ala—Val—Tyr—Asn—Lys

Phe—His—Cys—Asn

The sequences of the smaller peptides produced by chymotrypsin digestion were as follows:

Asn—Lys—Cys—Thr—Ala—Ser—Ile—Lys—Phe

Arg—Thr—Arg—Gln—Arg—Gln—Phe

His—Cys—Asn

Ala—Val—Ty

The reversible chemical reaction

A+B⇌C+D

has the following equilibrium constant:

Kc=[C][D][A][B]=5.9

Initially, only A and B are present, each at 2.00 M. What is the final concentration of A once equilibrium is reached?

Part B

What is the final concentration of D at equilibrium if the initial concentrations are [A] = 1.00 M and [B] = 2.00 M ?

Suppose you have a solution containing CuBr42- and CuSO4 at room temperature. You want to isolate a solution of only CuSO4. You have the following AgNO3 (s), a pot of boiling water, a bucket of ice, and a coffee filter. Using only the things listed suggest a way to isolate a solution of pure CuSO4. (K+ is a spectator ion and will be present in all solutions. Ksp Ag2SO4 1.5 ×10-5 and Ksp AgBr 5.0 × 10-13).

During reflux, you oxidized ethanol to acetic acid, using postassium dichromate.

A) How many grams of ethanol can be oxidized by 100.00mL of a 0.750M K₂Cr₂O₇ solution?

B) In a similar reaction, a chemist oxidizes methanol (CH₃OH) to formic acid (HCOOH), also using K₂Cr₂O₇. Starting with half reactions, write a balanced redox equation for the reaction performed by the chemist. Show all steps

i. Which reactant is the oxidizing agent

ii. Which reactant is the reducing agent?

33)

(a) A piston at 5.9 atm contains a gas that occupies a volume of 3.5 L. What pressure would have to be placed on the piston to force the volume to adjust to 0.32 L?
_____________ atm

(b) A piston at -44.0°C contains a gas that occupies a volume of 2.5 L. To what temperature would the gas have to be heated to increase the volume to 4.4 L at constant pressure?
__________ °C

(c) A piston at 795 torr contains a gas that occupies a volume of 4.7 L. What pressure would have to be placed on the piston to force the volume to adjust to 0.78 L?
___________atm

a. 0.130 g of HCl is in 35.0 mL of water. This is mixed with 50.0 mL of 0.185 M Sr(OH)₂. What is the pH of the resulting solution?

b. Calculate the pH of a solution prepared by mixing 125.0 mL of 0.0120 M HCl with 25.0 mL of 0.0420 M Ba(OH)_2?

_c.

Explain the process that occur in a coagulation bath, use PAN as an example.

8. What kinds of functional groups or coatings are available in SPE cartridges and how does one elute the sample through the cartridges?

Answer the following multiple choice questions below:

1a. Increasing the flow rate of the mobile phase would:

1b. Reverse phase HPLC of a multi-component solute usually uses:

1c. When two analytes, A and B, are passed through a chromatography column, A emerges first. We can then say:

1d. In a given chromatographic column,

1e. In a gas chromatography experiment using a non-polar stationary phase:

Given the reactivity difference for the 4- position versus the 1-position, do you think that the chlorine atom stabilizes, destabilizes or has no effect on an adjacent radical? Is it the Resonance or Inductive effect?

Use: 1,4-dichlorobutane, 1,3-dichlorobutane, 1,2-dichlorobutane and 1,1-dichlorobutane

Calculate the pH of a 0.0290 M aqueous solution of the weak base triethylamine ((C2H5)3N, Kb = 5.20×10-4). pH = ?

4. A solution of benzene and toluene at 25C and 760mmHg has a total vapor pressure (P_total) of 71.08 torr (mmHg). If the partial pressures of benzene (P_benzene) and toluene (P_toulene) are 60.86 torr and 122 torr respectively, what are the percentages of a. benzene; and b. toluene, in the corresponding vapor above the liquid. Please show all the calculations.

(b) If the vapor pressure of pure benzene is always higher than the vapor pressure of pure toluene when they are both at the same temperature and applied pressure, which of the two (benzene or toluene) should always have the higher temperature? Why?