the following adsorption isotherms: Langmuir, BET, Temkin, and Freundlich. Indicate when and why each is likely to be appropriate.

6. What technique(s) would you use to determine crystallinity in a polymer?

7. What thermal instrumental technique would you use to determine Tg?

Chromium metal can be electroplated from an acidic solution of (CrO₄)^-2

a.      Write the half reaction

b.     Determine the equivalent weight of Cr.

c.      What mass of Cr, in grams, will be deposited by a current of 98.54 C?

d.     What mass of Cr, in grams, will be deposited by a current of 3.0 amps passing for 4 minutes?

e.      How many minutes will it take for 1.5 grams of Cr to be deposited by a current of 1.2 amps?

f.      How many Faradays of electricity are required to deposit 52 grams of Cr.?

3- 1 mole of liquid benzene is in equilibrium with 1 mole of gaseous benzene at 80.1 oC in a isolated piston at 1.00 atm. Suppose the pressure of the piston is increased to 2.00 and kept constant, and no heat flows in and out of the system. What will be the final composition, volume, and the temperature inside the piston? Assume perfect gas behavior for the gas and molar volume of the liquid benzene (90.0 cm3/mol) does not change significantly in this pressure range.

1. Estimate the effect of addition of 0.020 mol of NaOH on the pH of 1.0 dm³ of (a) 0.15 M CH₃COONa(aq) and (b) a buffer solution containing 0.15 M CH₃COOH(aq) and 0.15 M NaCH₃CO_2(aq).

32. Compare and contrast dendrimers with block copolymer micelles, globular proteins, inorganic nanoparticles in terms of attributes and likely utility in the following applications: (a) drug delivery; (b) homogenous catalysis; and (c) solubilization..

2- The vapor pressure of pure benzene (M=78.12 amu) and pure toluene (M=92.14 amu) at 298.15 K are 103.1 Torr and 28.4 Torr, respectively. A solution is prepared from a mixture of 100.0 g each, under 1.000 atm pressure and equilibrium is established. i- What would be the composition of the vapor assuming the solution to be an ideal one? (5 pts) ii- What are the changes in the chemical potentials of the liquid and gaseous benzene and toluene upon formation of the solution? (10 pts) iii- Calculate the activity and the activity coefficient of benzene in the solution, if the experimentally found vapor pressure of benzene was 60.23 Torr. (10 pts) iv- Without doing explicit calculations, predict the activity coefficient of toluene in the solution. (5 pts)

Consider the following three reactions. For each of the reactions, use data in Appendix C in the textbook to calculate ΔH∘, ΔG∘, and ΔS∘ at 25 ∘C.

Calculate ΔS∘ for C2H6(g)+7Cl2(g)→2CCl4(g)+6HCl(g) Express your answer using three significant figures.

Calculate ΔG∘ for C2H6(g)+7Cl2(g)→2CCl4(g)+6HCl(g) Express your answer using four significant figures.

Calculate ΔH∘ for BaO(s)+CO2(g)→BaCO3(s) Express your answer using four significant figures.

Calculate ΔG∘ for BaO(s)+CO2(g)→BaCO3(s) Express your answer using four significant figures.

12. There is an interesting problem occurring with (poly(ethylene terephthalate )PET recycling. Some manufacturers are including additives intended to help in the degradation of PET. Mention some additive samples.

11.Why is PEG(poly-ethylene glycol) can bewidely used in drug delivery? Hint: considering the water solubility of the polymer.

In a constant-pressure calorimeter, 60.0 mL of 0.330 M Ba(OH)2 was added to 60.0 mL of 0.660 M HCl. The reaction caused the temperature of the solution to rise from 23.72 °C to 28.22 °C. If the solution has the same density and specific heat as water (1.00 g/mL and 4.184 J/g·K, respectively), what is ΔH for this reaction (per mole of H2O produced)? Assume that the total volume is the sum of the individual volumes.

46. Define Young’s modulus. Should it be high or low for a fiber?

47. Define the proportionality constant in Newton’s law.

An environmental chemist obtained a 200 mL sample of lake water believed to be contaminated with a single monoprotic strong acid. Titrating this sample with a 0.0050 M NaOH(aq) required 7.3 mL of the NaOH solution to reach the endpoint. If the size of the lake can be approximated as 1.1 km long by 2.3 km wide, and has an average depth of 10 m, estimate how many moles of the strong acid are present in the lake?

50.0 ml of 0.200 M AgNO₃ is mixed with 50.0 ml of 0.050 M NaCl. Calculate the concentration of Ag + and Cl- in the resulting solution, assuming the volumes are additive.

Ksp(AgCl) = 1.82*10^-10

1. 0.075 moles of LiF is added to 1 L of a saturated solution of BaF2.

a) write the ksp reaction and expression for BaF2. explain

b) what is the molar solubility of the BaF2 in the solution with the added LiF? explain

2. A saturated solution of silver chloride is in equilibrium with solid silver chloride. These reagents are added to seperate portions of the mixture. What effect (if any) with each of them have on the amount of solid silver chloride present? (increase, decrease, no change) and explain why

a. sodium chloride

b. nitric acid

c. ammonia