xplain the purpose/function of each of the following reagents used in the isolation of the iron containing protein: (4 points each)

Chymotrypsin

Hydroxylamine hydrochloride

1,10‐phenanthroline

Ethanol

Trichloroacetic acid

A pycnometer is a device used to measure densities. You are in the lab and need to measure the density of an unknown solid. The pycnometer is weighed empty and once again when it is filled with methanol at 18°C (the density of methanol at 18°C is 0.7914 g/mL). The following data is obtained:

        Mass of the pycnometer: 127.111 g

        Mass of the pycnometer and the methanol: 378.024 g

The pycnometer is emptied and 17.66 g of solid are placed into it. It is then refilled with water at 18°C (density of water at 18°C = 0.99862 g/mL) and is found to have a mass of 459.704 g.  You are told the solid is one of the following:

Copper: (d = 8.96 g/mL)

Gold: (d = 19.30 g/mL)

Silver (d = 10.50 g/mL)

What is the identity of the solid?

NH4CIO4 is the solid rocket fuel used by the U.S Space Shuttle. It reacts with itself to produce nitrogen gas (N2), chlorine gas (Cl2), oxygen gas (O2), water, and a great deal of energy. What is the maximum mass(in grams) of oxygen gas that can be produced by the reaction of 7.28g of NH4ClO4?

1)

The predominant isotope of gold, 197 79Au, has an experimentally determined exact mass of 196.967 amu. What is the total nuclear binding energy of gold in electronvolts per atom?

Express your answer to three significant figures and include the appropriate units.

2)

A particular smoke detector contains 1.35 μCi of 241Am, with a half-life of 458 years. The isotope is encased in a thin aluminum container. Calculate the mass of 241Am in grams in the detector.

Express your answer numerically in grams.

3)

Neutron activation analysis for a sample of a rock revealed the presence of 5124Cr ,which has a half-life of 27.8 days . Assuming the isotope was freshly separated from its decay products, what is the mass of 5124Cr in a sample emitting 1.00 mCi of radiation?

Express your answer in grams to three significant figures.

You hear about an opportunity for a process engineer with a company that is starting a new commercial plant to produce ethanol from hybrid poplar trees. You apply and soon get called for an interview!

As a good candidate for the position, you do your own search about the company before visiting it, and find out that their current process uses direct fermentation of sugars to obtain ethanol. They are heavily considering an alternative option, though, which employs fermentation of sugars to acetic acid, followed by hydrogenation of the acetic acid to produce ethanol. The article you read about this only mentions that this alternative “reduces carbon emissions”.

As it turns out, during the interview you are asked to provide a detailed, technical opinion about each one of these two routes. Specifically, you are asked about the challenges involved in separation: in one case, you need to separate ethanol from water after fermentation, in the other case you need to separate acetic acid from water after fermentation. You remember the concepts you learned in class about multiphase, multicomponent systems and attempts to answer the following questions: How would you design a system for separation in each case? What type of separation? What would be the challenges involved?

In addition, your response could include other aspects such as the stoichiometry of each reaction, and potential energy requirements. Be as quantitative as possible.

What is the difference between the virial equation of state and the SRK equation of state? When would you use one versus the other?

1)Choose all of the statements below that would change the volume of gas depicted in Cylinder A to that of Cylinder B.

a□ Increase the pressure by a factor of 6 while holding the Kelvin temperature and the moles of gas constant.

b□Reduce the pressure by a factor of 6 while holding the temperature and the moles of gas constant.
c□Increase the Kelvin temperature by a factor of 6 while holding the pressure and the moles of gas constant.
d□Simultaneously double the pressure and decrease the Kelvin temperature by a factor of 3 while holding the number of moles constant.
e□Simultaneously halve both the pressure and the Kelvin temperature while holding the number of moles of gas constant.
Select all of the above that apply

2)How many Ne atoms are present in a 2.80 L sample of Ne at STP? (Enter your answer using scientific notation. For scientific notation, 6.02 x 102323 is written as 6.02E23.)

3)What is the temperature, in ºC, of 0.938 moles of Cl2 gas with a pressure of 3.24 atm and volume of 9.31 L?

4)What is the volume, in L, of 0.690 moles of O2 gas having a temperature of 67.9 ºC and pressure of 5.86 atm?

5)A gaseous mixture composed of 16.0 g of O2 , 21.0 g of N2, and 16.0 g of He at 20.0°C is confined in a 25.0 L container.
What is the partial pressure of N2 in this mixture?

6)A gaseous mixture composed of 16.0 g of 2, 21.0 g of N2, and 16.0 g of He at 20.0°C is confined in a 25.0 L container.
What is the partial pressure of He in this mixture?

7)Assuming ideal gas behavior, what is the pressure in atm exerted by 1.57 mol Cl2(g) confined to a volume of 1.50 L at 273K?

Calculate the [H+] and [OH-] of each of the following solutions. 0.010 M HCl 0.010 M H2SeO4 0.025 M KOH 0.020 M Ba(OH)2

How can X-Ray Diffraction characterize the structure or molecular structure of a polymer?

In your previous studies last semester, you encountered reactions went to completion and were written A + B → C + D. You are now learning about reactions that achieve equilibrium and are written A + B ↔ C + D. Give the definitions of both types of reactions and justify the statement using mathematical relations that "reactions that go to completion are a subclass of the more general equilibrium reaction."

Consider the following 50.00 mL of 0.300 M acetic acid (HC2H3O2) was titrated with 0.200 M potassium hydroxide (KOH).

HC2H3O2 + KOH H2O + C2H3O2-K+

A. Calculate the pH of the solution when 20.00 mL of 0.200 M KOH is added.

B. Calculate the pH of the solution when 40.00 mL of 0.200 M KOH is added.

C. Calculate the pH of the solution when 50.00 mL of 0.200 M KOH is added.

A mixer used to prepare 1000 kg of 8 wt% sodium hydroxide (NaOH) solution. The feeds to the mixer are 10 mol% sodium hydroxide solution in water and pure water. What are the quantities (in kg) of pure water and 10 mol% sodium hydroxide solution to be added to the tank?

During the purging steps in the Schlenk line experiment, why does the chemist close the nitrogen before opening the vacuum? What gas is being evacuated?

multiple choice Q

A mixture of N₂, O₂, and Ar has mole fractions of 0.25, 0.65, and 0.10, respectively. What is the pressure of N₂ if the total pressure of the mixture is 3.9 bar?

Two methods were used to measure fluorescence emission of a dye and following data were obtained;

A) Are the std. deviations are significantly different?

B) Are the means are significantly different?