Describe the different type of transformations that can be carried out using enzymes

Consider the following peptide: Cys-Arg-Pro-Asp-Thr-Leu-His-Lys-Gln-Glu-His

How is the peptide different at pH = 6 and pH 8? Which of the two pHs would you use to run an ion exchange column, and would you choose anion or cation exchange?

A weak base, B, (Kb=1.0 *10-7) equilibrates between water (phase 1) and benzene (phase2). a) Define the distribution coefficient for this system b) Explain the difference between the partition coefficient, K, and the distribution coefficient, D, for this system. c) Calculate D at a pH of 9 if K=5.0 d) Will D be greater at pH of 10 than 9? Explain.

The molar concentration of HCL in a solution used to remove boiler scale from plumbing can be determined by titration with a NaOH solution.

10 ml. of the HCL solution is placed in a 125 ml. beaker; 50 ml. of DI water are added along with 1 – 2 drops of phenolphthalein solution. It took 44.0 l. of 0.125M NaOH solution to reach an end point.

Write the reaction for the equation, calculate the number of moles of NaOH required for the titration, the number of moles of HCL in the HCL sample that was titrated and calculate the molarity in the boiler scale removal solution.

Calculate pBa when 50.00 mL of 0.100 M EDTA is added to 50.00 mL of 0.100 M Ba2+. For the buffered pH of 10, the fraction of EDTA in its fully deprotonated form is 0.30. Kf = 7.59 x 107 for BaY2-.

a) 7.36

b) 7.88

c) 1.30

d) 4.33

The following data was collected in a laboratory experiment conducted at 305.2 K.

A.) Determine the complete rate law for this simple chemical process A → B

Time	Concentration
0	4.804
0.5	3.26799191
1	2.279801588
1.5	1.573137404
2	1.047454686
2.5	0.713650161
3	0.52422989
3.5	0.366551798
4	0.218181335
4.5	0.183699478
5	0.132508896
5.5	0.097326158
6	0.033145439
6.5	0.036526291
7	0.005104128
7.5	0.017253798
8	0.01185835
8.5	0.008150117
9	0.025601488
9.5	0.016150157
10	0.002645956
10.5	0.018181463
11	0.018750139
11.5	0.020859016
12	0.020590393
12.5	0.01959423
13	0.019721118
13.5	0.000191672
14	0.000131734
14.5	0.01990946
15	0.019937773

B.) For the set of kinetic data in the problem above, if the rate doubles when the temperature increases to 415.4 K, what is the activation energy for the process?

Barium chloride and potassium carbonate combine to form barium carbonate and potassium chloride. The equation for this chemical reaction is shown below.

BaCl₂ + K₂CO₃--> BaCO₃ + KCl

An unknown compound contains only C, H, and O. Combustion of 6.10 g of this compound produced 14.9 g of CO2 and 6.10 g of H2O. What is the empirical formula of the unknown compound?

Ignoring activities, determine the molar solubility (S) of Zn(CN)2 in a solution with a pH = 1.34. Ksp (Zn(CN)2) = 3.0 × 10-16; Ka (HCN) = 6.2 × 10-10.

How much heat is released when 85.0 g of steam at 100.0°C is cooled to ice at -15.0°C? The enthalpy of vaporization of water is 40.67 kJ/mol, the enthalpy of fusion for water is 6.01 kJ/mol, the molar heat capacity of liquid water is 75.4 J/(mol ⋅ °C), and the molar heat capacity of ice is 36.4 J/(mol ⋅ °C).

Part A

Calculate the pH in 1.00MCH3CO2H.

Part B

Calculate the concentrations of all species present (H3O+, CH3CO2?, CH3CO2H, and OH?) in 1.00M CH3CO2H.

Answer the following questions based on the reaction: K2CrO4 + AgNO3 ---> red solid. A: What is the formula for the solid produced? B: Using the reaction above, a chemestry student has 35 mL of a .250 M solution of silver nitrate. How many milliliters of .105 M K2CrO4 will be required to react completely with the silver ion present. C: Considering the reaction in part b, how many grams of product will be formed?

A 0.380 m aqueous solution of NaCl is prepared at 20.0∘C. Assume that the density of the solution at 20.0∘C is 1.082 g/mL.

Calculate the molarity of the salt solution.

Describe why high pressures but low temperatures cause substances to deviate from ideal gas conditions. Make sure to discuss the assumptions we made to come to the ideal gas law and how high pressures and low temperatures negate those assumptions.