Q1. The hormone norepinephrine is released in the human body during stress and increases the body’s metabolic rate. Like many biochemical compounds, norepinephrine is composed of carbon, hydrogen, oxygen, and nitrogen. The percent composition of this hormone is 56.8% C, 6.56% H, 28.4% O, and 8.28% N. What is the empirical formula of norepinephrine?  

Q2. Elemental magnesium consists of three isotopes: ²⁴Mg with an accurate mass of 23.99 amu, ²⁵Mg with an accurate mass of 24.99 amu, and ²⁶Mg with an accurate mass of 25.99 amu. If ²⁴Mg is 79% of naturally occurring magnesium, what is the percent abundance of ²⁶Mg?   

A) 10%

B) 11%

C) 15%

D) 19%

E) 21%

Q3. A compound containing xenon and fluorine was prepared by shining sunlight on a mixture of Xe (0.526 g) and excess F₂ gas. If you isolate 0.678 g of the new compound, what is its empirical formula?  

1) A compound with molar mass 110.1 g/mol has the following composition:

Determine the empirical formula

(Express your answer as a chemical formula.)

(Input the elements in your formula in the order shown above. If parentheses are needed in the formula, be sure to include them in your answer.)

2)

A compound with molar mass 110.1 g/mol has the following composition:

Determine the empirical formula

(Express your answer as a chemical formula.)

(Input the elements in your formula in the order shown above. If parentheses are needed in the formula, be sure to include them in your answer.)

3)

Arrange the following substances in order of increasing percent of chlorine.

Enter the letter (A-D) corresponding to each substance.
(least)  <  <  <  (greatest)

Write the empirical formula of each of the following substances. Part A C6H6O3, pyrogallol, a developer in photography Express your answer as a chemical formula.

Part B C6H12O6, galactose, a carbohydrate Express your answer as a chemical formula.

Part C C8H6O4, terephthalic acid, used in the manufacture of plastic bottles Express your answer as a chemical formula.

Part D C6Cl6, hexachlorobenzene, a fungicide Express your answer as a chemical formula.

A major cab company in Chicago has computed its mean fare from O'Hare Airport to the Drake Hotel to be

$

28.99

, with a standard deviation of

$

3.79

. Based on this information, complete the following statements about the distribution of the company's fares from O'Hare Airport to the Drake Hotel.

(a) According to Chebyshev's theorem, at least ?56%75%84%89% of the fares lie between 21.41 dollars and 36.57 dollars.

(b) According to Chebyshev's theorem, at least ?56%75%84%89% of the fares lie between 19.515 dollars and 38.465 dollars.

(c) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately ?68%75%95%99.7% of the fares lie between 21.41 dollars and 36.57 dollars.

(d) Suppose that the distribution is bell-shaped. According to the empirical rule, approximately 99.7% of the fares lie between

dollars

and

dollars

.

Find the mean, median, mode, and standard deviation (round standard deviation to the nearest whole number) for the following SAMPLE set of test scores.

            90 85 75 70 80 80

Using the above information and the Empirical Rule:

1. What percent of scores would you expect to fall between 66 and 87?                    ____________

2. 68% of the time you would expect scores between what two values?                     ____________

3. Determine the z-score for a test score of 64.                                                             ____________

4. What data value would have a z-score of + 2?                                                          ____________

5. Determine the z-score for a data value of 70 (round to nearest hundredth).           ____________

6. Why can we use the empirical rule with this data set? Explain your answer.

Let’s assume that another student scores a 95 on the next test. What would this do to the shape of the distribution? Explain your answer.

1) How does Minimum wage cause unemployment?

A) Given that the effects of the minimum wage on employment differ based on the assumptions made about labor supply and demand (elastic vs. inelastic) and the structure of the labor market (perfectly competitive vs monopsonistic) how can economists then try to find the answer this question?

B) Carefully explain what methods economists could use to explore this social issue. Evaluate the empirical evidence and data and write your own interpretive analysis.

C) Can you think of few reasons why an increase in minimum wage would not lead to an increase in unemployment (besides the arguments you made under monopsony)? Can you think of few reasons that the unemployment would go up, even if the minimum wage stays the same? How do the answers to these questions impact the reliability of empirical data?

1. A 2.168 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 5.607 grams of CO2 and 1.148 grams of H2O are produced. In a separate experiment, the molar mass is found to be 136.2 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

2.A 6.210 gram sample of an organic compound containing C, H and O is analyzed by combustion analysis and 10.34 grams of CO₂ and 3.388 grams of H₂O are produced.

In a separate experiment, the molar mass is found to be 132.1 g/mol. Determine the empirical formula and the molecular formula of the organic compound.

3.A 0.5079 g sample of a pure soluble bromide compound is dissolved in water, and all of the bromide ion is precipitated as AgBr by the addition of an excess of silver nitrate. The mass of the resulting AgBr is found to be 0.9007 g.

What is the mass percentage of bromine in the original compound?

Select an ethical dilemma related to health policy from the categories of moral values, professional regulation, health of individuals in society, or distributive justice. What are the controversies surrounding this issue? What are the opposing ethical principles? How has past or current health policy addressed this dilemma? Support your reasoning with reference citations.

Select an ethical dilemma related to health policy from the categories of moral values, professional regulation, health of individuals in society, or distributive justice. What are the controversies surrounding this issue? What are the opposing ethical principles? How has past or current health policy addressed this dilemma? Support your reasoning with reference citations.

Select an ethical dilemma related to health policy from the categories of moral values, professional regulation, health of individuals in society, or distributive justice. What are the controversies surrounding this issue? What are the opposing ethical principles? How has past or current health policy addressed this dilemma? Support your reasoning with reference citations.