Describe how to prepare 50 mL of solution buffered at pH 5.00. The buffer must be designed so the pH changes no more than 0.10 units with the addition of 0.001 moles of acid or base. Choose from the following to design the buffer. Be sure to choose the buffer pair best suited to the assigned conditions.

1.acetic acid/sodium acetate

2.formic acid/sodium formate

3. benzoic acid/sodium benzoate

please show your work-thank you!

The president of a company asked a random sample of employees how they felt about the work they were doing. The following table gives a breakdown of their responses by gender. Does the data provide enough evidence to conclude that the level of job satisfaction is related to gender? Use alpha = .10

The null hypothesis

1. Would have to be revised
2. No changes
3. Would not be rejected
4. Would be rejected

1. A nuclear medicine source made of 32P with half-life of 14.3 days emits beta particles at 0.70 MeV. Ten grams of 32P concentrate in a tiny tumor in the bladder after injection. The activity is initially 1.0 x 1010 Bq. Compute the dose (in units of Gy) delivered at the tumor two half-lives after injection. For a more accurate answer, you should integrate the dose rate over time as the source strength changes due to radioactive decay.

(TAX SYSTEMS AFTER CORONA IN EGYPT)

(Deadline: Thursday, 11 June)

You are individually required to prepare and write a research paper about the suggestions and the changes that should be made on the tax systems in Egypt after the Coronavirus pandemic. You must show your point of view and explain the reasons for the suggestions that you made in your research. Your research report should be based on the following topics that were covered throughout the semester:

•   Building Reality Tax (BRT) (10 points)

4a. Explain which biosafety cabinet is most suitable for a procedure that involves animal cells and flammable solvents.

b. A vessel disinfection procedure must be modified to sterilize the vessel. What types of changes in the procedure might be proposed?

c. Explain why TLV-TWA values cannot be used as a measure of relative toxicity of chemicals. 4d. Explain why maintaining a work environment at chemical concentrations below the TLV-TWA does not guarantee prevention of any adverse health effects for workers.

Threw has recently issued two bonds with semi-annual payments of R50. One bond has maturity of 2 years and the other one has a maturity of 10 years. Both bonds currently sell at par R1 000, with a yield-to-maturity (YTM) of 9%.

Required:

3.1. Calculate the price of each bond if the YTM drops to 6%. [4]

3.2. Calculate the price of each bond if the YTM rises to 10%. [4]

3.3. Comment on the pattern observed as a result of these changes. [2]

An economy on the balanced growth path experiences a natural disaster. A hurricane destroys
50% of the economy’s population and 75% of its capital stock. Show the path of the following
variables (Note: your answer should consist of a graph of a variable or the log of a variable on
the vertical axis, and time on the horizontal axis) and explain the changes over time to the following variables.
A) Capital and production per worker (k and y)
B) Employment N
C) Capital stock K
D) Output Y

A survey found that? women's heights are normally distributed with mean 63.9 in and standard deviation 2.4 in. A branch of the military requires? women's heights to be between 58 in and 80 in.
a. Find the percentage of women meeting the height requirement. Are many women being denied the opportunity to join this branch of the military because they are too short or too? tall?
b. If this branch of the military changes the height requirements so that all women are eligible except the shortest? 1% and the tallest? 2%, what are the new height? requirements?

When the analysis is warranted, more credit will be given for answers that use the diagrams presented in class. More credit will also be given for answers that include a “story” providing an intuitive explanation of the situation. For stats-book questions, more credit will be given for more specific answers.

The prices of products and the wages paid to labor each change over time. Describe how prices and wages have changed over time. For your description of wage changes, include a description of how nominal and real wages change