Consider the following equilibrium.
CS2(g) + 3 O2(g) equilibrium reaction arrow CO2(g) + 2 SO2(g)
If the reaction is started in a container with 5.59 atm CS2 and 13.3 atm O2, what is Kp if the partial pressure of CO2 is 3.76 atm at equilibrium? (There is no change in temperature and the initial partial pressures of the products are equal to 0.)

Calculate the pH and the pOH of an aqueous solution that is 0.025 M in HCl ( aq ) and 0.085 M in HBr ( aq ) at 25 °C.

p H =

p O H =

1) An aqueous solution contains 0.34 M nitrous acid.

One Liter of this solution could be converted into a buffer by the addition of:

(Assume that the volume remains constant as each substance is added.)

0.17 mol HCl

0.35 mol HCl

0.35 mol KNO₂

0.086 mol Ca(OH)₂

0.34 mol KCl

2)  

An aqueous solution contains 0.26 M ammonium chloride.

One liter of this solution could be converted into a buffer by the addition of:

(Assume that the volume remains constant as each substance is added.)

0.25 mol NH₃

0.06 mol Ba(OH)₂

0.25 mol KCl

0.26 mol HI

0.12 mol HI

Calculate ΔH° for the reaction C4H4(g) + 2H2(g) → C4H8(g), using the following data:

ΔH°combustion for C4H4(g) = –2341 kJ/mol

ΔH°combustion for H2(g) = –286 kJ/mol

ΔH°combustion for C4H8(g) = –2755 kJ/mol

A) –128 kJ

B) 158 kJ

C) –158 kJ

D) 128 kJ

E) None of these choices are correct.

Calculate the theoretical yield of Cu(NH3)4SO4∙H2O (MW = 245.7g/mol) based on 10.0g of CuSO4∙5H2O (MW = 249.7g/mol).

A sample weighing 3.082 g is a mixture of Fe2O3 (molar mass = 159.69) and Al2O3 (molar mass = 101.96). When heat and a stream of H2 gas is applied to the sample, the Fe2O3 reacts to form metallic Fe and H2O(g). The Al2O3 does not react. If the sample residue (the solid species remaining after the reaction) weighs 2.637 g, what is the mass fraction of Fe2O3 in the original sample?

in boiling point determination, you first raise the temperature until bubbles starts to come out of the glass bell. at this temperature when bubbles are coming out of the glass bell, is your temperature higher or lower than the actual boiling point? explain.

Paper chromatography lab experiment. (color dye)

in the solvent system that you use for analyzing your unknown a)name the important intermolecular forces acting between the dye and the solvent and b)the dye and stationary phase for (i) the dye with the largest Rf value (ii) the dye with the smallest Rf value. comment on the relative important of the types of the forces that result in observe Rf value. c) what statical test could you apply to give some quatitation of your confidence that your known and unknown have the same Rf value?

Calculate the cell potential for the following reaction as written at 25.00 °C, given that [Zn2 ] = 0.763 M and [Sn2 ] = 0.0140 M. Standard reduction potentials can be found here.

Zn(s)+SN²⁺ YIELDS Zn²⁺(aq)+Sn(s)

1.)Glucose has a solubility of 125 g /100 mL. What is the approximate concentration of glucose in a saturated solution? How much glucose can be dissolved in 745 mL of water?

Glucose_____M
Glucose_____g

2.) Determine whether the following salts or molecules will have higher or lower solubility in water at higher temperatures.

KCl(s) + H2O(l)----> KCl(aq), ?Hrxn > 0 ____________
NH3(g) + H2O(l)---> NH3(aq), ?Hrxn< 0 ____________

3.) BaF2 has a Ksp of 2.45 x 10-5. What is the solubility of BaF2? What is the F- concentration in a saturated barium fluoride solution?

Solubility of barium fluoride ___________
[F-]= ___________

Propane (C3H8) is often used for barbeque and heating.
(a) Determine the density (in g/L) of propane at STP assuming propane behaves as an ideal gas.

(b) Determine the density (in g/L) of propane at 21.1oC and 0.912 atm assuming propane behaves as an ideal gas.

The H2 antagonist burimamide showed poor bioavailability in clinical trials.

(i) Define the term bioavailability. In your answer, distinguish bioavailablility
from bioactivity.
(ii) Protonation of the imidazole ring was identified as a reason for the low
bioavailability of burimamide. Explain, using appropriate structures, why
thiaburimamide, which features a sulfur atom in the alkyl chain, led to
increased bioavailability.

(iii) Thiaburimamide, also led to a modest increase in bioactivity. Propose a
reason for this increase in activity.

Your project should be on temperature adaptation or thermostability of proteins.

For a temperature adaptation project select an ectothermic organism with sub-species living in different climates. You will then focus on one protein, preferably an enzyme, for which you need to find amino acid sequences (one for each sub-species). You also need at least one crystal structure of this protein with enough sequence similarity to your selected amino acid sequences to make it feasible to create homology models. Finally, you will make comparisons between the structures or homology models while focusing on structural features that promote protein stability.

OR

For a thermostability project select a thermophilic organism (for example a bacterium thriving in a hot spring) and one protein, preferably an enzyme for which a crystal structure is already available. Next, you will need to search for crystal structures and/or amino acid sequences of your selected protein in other non-thermophilic organisms so that you can make comparisons between the crystal structures (or homology models). Aim to identify structural features that promote the thermostability of the protein from the thermophilic organism.

State the parameters of your project:

Species:

Protein(s):

PDB ID:

Confirm that you will have access to protein sequences and at least one protein structure (as a template for homology modeling) so that you can carry out your project. Post the access codes for the sequences and the PDB-ID(s) here:

Make a list of structural features that promote protein stability:

Note: Except the isocitrate dehydrogenase protein.

example like in the below articke

Most stars, including our own sun, undergo nuclear fusion using hydrogen as the primary fuel source. Some stars, however, use helium, carbon, or other elements as their primary fuel, and all stars will have at least trace amounts of many other elements. Describe a way you can use the concepts of atomic spectroscopy to determine the elemental composition of stars.