A standard iodate solution is prepared at 22.0 °C by dissolving 0.9123 g (uncorrected mass) of KIO3 with deionized water in a 499.92 mL volumetric flask. To standardize the Na2S2O3 solution, a 10.005 mL aliquot of the KIO3 solution is acidified, treated with excess KI, and titrated with Na2S2O3, requiring 22.05 mL to reach the end point. Finally, a 10.005 mL aliquot of unknown Cu solution is reduced with excess KI. The liberated iodine requires 31.46 mL of Na2S2O3 solution to reach the end point. Calculate the unknown Cu concentration in g/L.

These are what the correct step answers should be, just need to show how to do work:

[KIO3 standard (corrected to 20 °C): 8.53255 mM]

[S2O3 2− titrant: 23.2294 mM]

FINAL ANSWER: [Unknown: 4.64160 g/L Cu]

A protease is an enzyme that catalyzes the hydrolysis of the peptide bonds of target proteins. How might a protease bind a target protein so that its main chain becomes fully extended in the vicinity of the vulnerable peptide bond?

The hint that we got was this: look for a way the protease might stabilize the substrate during hydrolysis

I'm open to several possibilities at this point but please explain your answer in detail.

Solid carbon can react with gaseous water to form carbon monoxide gas and hydrogen gas. The equilibrium constant for the reaction at 700.0 K is Kp=1.60×10−3. If a 1.55-L reaction vessel initially contains 247 torr of water at 700.0 K in contact with excess solid carbon, find the percent by mass of hydrogen gas of the gaseous reaction mixture at equilibrium.

Show the calculation of the oxidation number (charge) of ONLY the atoms which are changing in the following redox equations and then show how they are used to balance the following redox equation. MnO + PbO2 + HNO3 → HMnO4 + Pb(NO3)2 + H2O

When a saturated paraffin such as polymethylene is chlorinated, chlorine replaces hydrogen at random. Invariably, small amounts of chlorine (10–50 wt% Cl) cause a lowering of softening point. Large amounts (about 70%) raise the softening point. Rationalize on the basis of intermolecular forces

1) Use the Henderson-Hasselbalch equation to calculate the pH of a buffer solution prepared by mixing equal volumes of 0.230 M NaHCO3 and 9.00×10⁻² M Na2CO3. (use Ka values given on Wiki)

2) A volume of 100 mL of a 0.440 M HNO3 solution is titrated with 0.440 M KOH. Calculate the volume of KOH required to reach the equivalence point.

1. When heated, calcium carbonate gives off CO2 according to the following reaction: CaCO3(s) → CO2(g) + CaO(s) You perform this reaction in lab by heating a test tube containing CaCO3 and collect the CO2 over water for later analysis. You collect 20.3 mL of gas. What mass of CO2 have you collected? Assume the temperature and pressure of your lab is 25 °C and 1.00 atm. The vapor pressure of water at 25 °C is 24.0 Torr. (a) 35.4 mg (b) 36.5 mg (c) 611 mg (d) 877 mg (e) 26.9 g

2. At 25 °C, the Ksp of CaSO4 is 9.1×10–6 . How many of the following procedures will change the value of Ksp for CaSO4? I. presence of Na2SO4 in solution II. changing the temperature of the solution III. changing the amount of water in solution IV. presence of Ca(NO3)2 in solution (a) 0 (b) 1 (c) 2 (d) 3 (e) 4

Given the following organic equation and data, calculate the experimental percent yield of benzoic acid in grams:

11.29 mL of ethyl benzoate was reacted with 6.3 grams of sodium hydroxide under reflux conditions using ethylene glycol and water as the solvents. After workup, 6.67 grams of benzoic acid was recovered.

you will have to determine limiting reagent, calculate theoretical yield and finally, calculate the percent yield.

Give answer in this format: XX.X %

A process stream flowing at 35 kmol/h contains 15 mole% H2 and the remainder 1-butene. The stream pressure is 10.0 atm absolute, the temperature is 50 oC and the velocity is 150 m/min. Determine the diameter (cm) of the pipe transporting this stream, using Kay’s rule in your calculations.

Derive a general expression for the spacing between adjacent energy levels in the 2D Rigid Rotor.

Part A:

How many coulombs are required to plate a layer of chromium metal 0.24 mm thick on an auto bumper with a total area of 0.29 m2 from a solution containing CrO2−4? The density of chromium metal is 7.20 g/cm3. Express your answer using two significant figures. Q = ______ C

Part B:

What current flow is required for this electroplating if the bumper is to be plated in 16.8 s ? Express your answer using two significant figures.

Please explain each of the questions, thanks.

1. Describle the correlation between bond energy and bond length for a series of single bonds.

2. Describle, with appropriate explanantions, the key factors which affect the magnitude of the lattice energy of an ionic substance.

3. Explain why hydrogen is placed in Group IA even though it really belongs in a group by itself.

4. Explain when and why chemists make use of the concept of hybridization.

5. Explain why the first member of each period (row) in the periodic table differs so greatly from the rest of the elements in the same period.

6. Explain how the elements in Group IVA differ.

7. Explain why the trend in electron affinity increases in general as you move from left to right across a period (row) of the periodic table.

A biochemist has 100 mL of a buffered solution at pH 7.3. The concentration of the buffer is 0.1 M, and the pKa of the buffer is 7.8. If the biochemist adds 80 mL of a 0.1 N KOH solution to the above buffered solution, what will be the final pH to the nearest tenth of a unit?