The average human body contains 5.50 L of blood with a Fe2+ concentration of 2.20×10−5 M . If a person ingests 9.00 mL of 21.0 mM NaCN, what percentage of iron(II) in the blood would be sequestered by the cyanide ion?

3. (a) What is SDS (sodium dodecylsulfate)? Draw the structure

(b) How would you separate a mixture of polypeptides according to their lengths using SDS –

polyacrylamide gel electrophoresis? Describe in a few sentences.

To 1.0 L of water, 2.8 × 10^–6 mol of Pb(NO₃)₂, 6.6 × 10^–5 mol of K₂CrO₄, and 1.0 mol of NaCl are added. What will happen?

A.No precipitate will form.

B.A precipitate of PbCrO₄ will form.

C.Both a precipitate of PbCl₂ and a precipitate of PbCrO₄ will form.

D.A precipitate of PbCl₂ will form.

E.A precipitate of KCl will form.

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.230A pyridine, C5H5N(aq) with 0.230M HBr(aq):

a.) before addition of any HBr

b.) after addition of 12.5 mL of HBr

c.) after addition of 20.0 mL of HBr

d.) after addition of 25.0 mL of HBr

e.) after addition of 36.0 mL of HBr

This is for my biochemistry lab, the experiment is dealing with trypsin and BPTI. I need to make a graph: plot the absorbance change per minute versus the BPTI concentration for each cuvette.

here are my cuvettes and amount of BPTI added to each

1- 0uL BPTI added

2- 10 uL BPTI added

3-20 uL BPTI added

4-30 uL BPTI added

5- 40 uL BPTI added

6- 50 uL BPTI added.

Each cuvette has a different amount of water and trypsin added to them, for a total volume of 100 uL in each cuvette.

I was give a sample of BPTI for which I had to find the concentration. Using the absorbance, I calculated that the concentration was 0.035mM. We then had to dilute this 10-fold, so to 0.0035mM.

I am not sure how to find the concentration of BPTI in each cuvette with this information. The molecular weight of BPTI is 6500. I don't know if that is needed.

I feel like this should be really easy, but I am having trouble doing this.

A single charcoal briquette has a mass of 0.1 kg, and is made up of almost entirely carbon. I want to burn that briquette in air in a sealed oven. When the combustion is complete, the gases in the oven will include CO2, O2, and N2, and the mole fraction of CO2 in this exhaust is 5%. How much air is needed (before the combustion)? Give your answer as kg, kg mole, and as a volume in m3 . Assume that p = 1 atm, and T = 400 ˚C

determine the pH of each two component solution

a.) 0.550 M HI and 0.850 M HF

b.) 0.112 M NaCl and 0.953 M HF

c.) 0.050 M KOH and 0.015 M Ba(OH)2

d.) 0.088 M HClO4 and 0.022 M KOH

Part A

It takes 55.0 J to raise the temperature of an 10.2 g piece of unknown metal from 13.0∘C to 25.0 ∘C. What is the specific heat for the metal?

Part B

The molar heat capacity of silver is 25.35 J/mol⋅∘C. How much energy would it take to raise the temperature of 10.2 g of silver by 15.4 ∘C ?

I got 36.9 J for B and its correct

Part C

What is the specific heat of silver?

50mL of 0.1M weak acid is titrated with 0.1 strong acid. Pka is 5.20

What is the pH before the acid is added

pH after adding 10mL of acid

pH after 50 mL is added

pH after 60mL is added

Thank you for the help, I dont mind doing the amth, mainly need help with the equarions, thanks!

A 0.268 mol sample of PCl5(g) is injected into an empty 4.05 L reaction vessel held at 250 °C. Calculate the concentrations of PCl5(g) and PCl3(g) at equilibrium. 1.80 @ 250 C

Calculate the pH for 0.15M KCL, 0.15M Na2HPO4, and 0.15M NH4Cl. I need to use ICE tables to find the pH for these, but I am having trouble making them work.

Explain what “k” means, and how it can be calculated for the iodine clock reaction. As part of your explanation, include a sample calculation. Explain in one well-developed paragraph.

1) 362.11 g of O2 are contained in a 3.00 L high pressure tank at a temperature of 186°C. What is the pressure of the gas in torr?

2) A gas has a given volume. The moles of gas are doubled then the pressure is 1/3 of the original pressure. After the pressure change, the Kelvin temperature quadruples (increases 4 times of the original Kelvin temperature). By how much has the volume changed? Be specific (i.e. the volume is 1/3 of the original volume, the volume is 8 time greater, etc.). If you need more information to answer, explain what information is needed.

3) A helium balloon has a volume of 2.54 L at 1.04 atm and 24^oC. The balloon is then released. Calculate the volume of the balloon (in L) when the pressure is 312 torr and the temperature is–47^oC.

4) A vapor occupies a volume of 237.2 mL at a temperature of 90.6°C and a pressure of 734.6 torr. The mass of the condensed vapor is 0.978 g. Calculate the molar mass of the vapor (hint: Use the ideal gas law to find the number of moles).

5) A chemist mixed 10.00 g of a sodium carbonate solution with 10.00 grams of a hydrochloric acid solution in an open beaker. The reaction mixture fizzed. The final mass of the mixture was 19.31 g. Did this reaction violate the Law of Conservation of Mass? Why or why not? Be sure to explain your answer for full credit (hint – think common sense).

How many configurational isomers are possible for the following compounds?

A. 4-chloro-3-hexen-2-ol

B. 2,4-hexadiene

C. 3-chloro-1,4-pentadiene