Surfactants form inverse micelles in nonpolar solvents.

a) Why?

b) Why is it difficult to determine the CMC of a surfactant in a nonpolar fluid by measuring its surface tension?

How can you distinguish polyethylene from polypropylene based on their spectra? Give specific differences both in the C-H region and in the C-C region. What functional group is this attributed to in its structural formula? 7. Ignoring the intensities and considering only the number of peaks in the C-H region, compare the spectra of polyethylene and polypropylene with polyvinyl chloride. Formulate a hypothesis relating the C-H region of the spectrum to the polymer structure (specifically, consider the hydrogen atom environments). Support your hypothesis with evidence from these three polymers.

An aqueous solution contains 5.8% KBr by mass.

Calculate the molality of the solution.

Calculate mole fraction of the solution.

Please help

An unknown molecule contains only sulfur atoms. Suppose 1 L of vapor of this 20) molecule is reacted with sufMicient oxygen at 1 atm and 500 °C to produce 8 L of SO2 gas. How many sulfur atoms does the unknown molecule contain in the vapor phase?

A) 8 B) 3 C) 2 D) 4 E) 6

If one mole of water (~18 mL, the system) is vaporized from liquid to gas at 100o C, the amount of work done on the surroundings is 2.5 kJ, while the change in internal energy for the system is 38.2 kJ/mol. What is the amount of heat required to vaporize one mole of water?

A) 38.2 kJ B) 35.7 kJ C) O40.7 kJ D) 40.7 kJ E) O35.7 kJ

One mole of an ideal gas is expanded from a volume of 1.00 L to a volume of 10.00 L against a constant external pressure of 1.00 atm. How much work (in joules) is performed on the surroundings?

A) 456 J B) 912 J C) 0.013 J D) 2740 J E) 2870 J

PLEASE SHOW WORK

can someone provide me the constitutional isomers of c5h12f2? can you also provide the name of the isomers? Thank you so much

Consider the titration of a 28.0 mL sample of 0.175M CH3NH2 with a 0.145M HBr. Determine each of the following.

I already got initial pH: 11.94 and the volume of added acid required to reach equivalence point: 33.8 mL.

I still need help with these:

1. The pH of 4.0 mL of added acid.

2. The pH at one-half of the equivalence point.

3. The pH of the equivalence point.

4. The pH after adding 4.0 mL of acid beyond the equivalence point.

This is all one question, but it is broken into several parts.

What is the difference between Raman scattering and IR absorption? Explain it using an energy diagram.

What is a difference between the Stokes Raman and the Anti-Stokes Raman scattering?

What does “Raman Shift” mean?

What is the major compound that comprises the top coating layer of an Excedrin tablet?

Draw the chemical structures of the three APIs contained in an Excedrin tablet.

You need to increase the dissolution rate of a slightly water soluble drug in tablet form. Propose three different solutions to this problem and explain why each of your solutions will solve the problem. (note that making a prodrug is not an option).

Given a 0.1 M NH4Cl solution: a) Which is the pH of this solution? b) If 100 mL of 0.1 M HCl solution are added to 100 mL of the original solution, which is the pH? c) And if 100 mL of 0.1 M NH3 are added to 100 mL of the original solution? Data: kb(NH3 ) = 1.8 10^-5 .

Provide a practical application of gelling properties of polysaccharides used in medical and industrial setting, and describe the mechanism of gelling for the application mentioned using a diagram.

2 SO3 (g) → 2 SO2 (g) + O2 (g) A sample of 2.0 mole of SO3 (g) is placed into an evacuated 2.0 L container and heated to 700K. The reaction occurs and the concentration of SO3 (g) as a function of time is shown in the graph below. Sorry the graph will not copy but is shows that SO3 at equilibrium is 0.4 mol/L

a) Determine the equilibrium concentrations of

SO2 (g) and O2 (g)

b) Calculate the value of the Kc and Kp equilibriumconstants for the reaction

1. Which is more dangerous if you spill it on your hand a 0.025 M HBr solution (Ka = 1.3 x 10⁶ ) or 0.75 M HClO₂ solution (Ka = 1.2 x 10^-2 )? Evaluate the H₃O⁺

^2. For each pair below indicate which is stronger and support your answer with an explanation. a. Which is a stronger acid, H₂S or PH₃? b. Which is a stronger base CO₃^-2  or C₂H₅O^-  ?

When an energetic electron with the velocity of 1.00 x 106 m s-1 was collided with Rb atom (assume stationary), Rb- anion moves at 313 m s-1 and released 382.4 nm of visible light. Calculate the energy change during the formation of Rb- anion from Rb atom in kJ mol-1

What is the pH of 0.51 M diethylammonium bromide, (C₂H₅)₂NH₂Br.
The K_b of diethylamine, (C₂H₅)₂NH, is 6.9 x 10^-4.