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lidia morales

lidia m.

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2. The solubility of urethane (ethyl carbamate, H2NCO2C2H5) in different solvents at room temperature is listed in the table below. (18 pts total) | Solvent | Solubility in 100 parts solvent (by weight) | | ----------- | -------------------------------------------- | | Water | 200 | | Ethanol | 125 | | Chloroform | 111 | a. Find the various distribution coefficients $K_D$ associated with the different solvents (e.g., $K_D$ = [H2NCO2C2H5]water / [H2NCO2C2H5]chloroform). Note that the ratio is dependent upon concentration of solute in solvent. (6) b. If you started with 15.6 g of urethane, what is the minimum amount of ethanol you would need to fully dissolve it? (2) c. If you measured out precise values of mass and volume but the urethane did not go into solution, what are two things you could you do to the solution (without adding additional solvent) to help it dissolve? (4) d. Would it make sense to extract the urethane from the ethanol into chloroform? Briefly explain your answer. (3) e. Would it make sense to extract the urethane from the ethanol into water? Briefly explain your answer. (3)

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You pick 7 digits (0-9) at random without replacement, and write them in the order picked. What is the probability that you have written the first 7 digits of your phone number? Assume there are no repeats of digits in your phone number. Give your answer as a fraction. 10!(10−7)!Incorrect

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In the case of an investment in equity securities where the investor does not have significant influence and the investment is carried at fair value, a dividend from the investee is: A a direct increase to retained earnings of the investor to offset the direct decrease to retained earnings of the investee. B an expense to the investor in the period of declaration. C income to the investor in the period of declaration. D a reduction of the carrying amount of the investment.

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It is highly recommended that the payroll administrator prepare a calendared checklist for year-end. TRUE OR FALSE

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How would each of the following modifications to the experimental procedure used in this investigation affect the mass of the product obtained? Indicate if the mass of the product would be greater, less, or unchanged. Explain your reasoning. (Note: CaCO3 is slightly soluble in water) The CaCl2 solution is added to the Na2CO3 solution instead of adding the Na2CO3 solution to the CaCl2 solution. b. The temperature of the reactant solutions is 40°C instead of room temperature. c. The residue is washed with hot distilled water instead of cold distilled water. d. The residue is not washed with distilled water at all. e. The reactions were performed using 20.00 mL of 1.00 M Na2CO3 instead of 20.00 mL of 0.500 M Na2CO3.

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ICSMPTMHIRZi3n MATHEMATICAL.LITERACYPI QUESTION 1 1.1 Use ANNEXURE A to aswer the following questions. 1.1.1 Calculate the value of A . 1:2. Werive tie herm opening Dalance. (2) 1.13 Show how the income of \( \mathrm{R} 6602,70 \) was calculated. (2) 1.1.4 Calculate the value of \( B \). (2) 1.1.5 Write the total expenditure in words. (2) 1.1.6 Determine the difference between the maximum and minimum October expenditure. (3) 1.2 The Matric Dance Fundraising Committee bought 4 boxes of pens and sold ench pen at \( \mathrm{R} 5,00 \) ench. 1.2.1 Calculate the cost of one black pen. 1.2.2 Deternine the profit made on one black pen. 123 Calculate the number of pens that were sold daring the fundraising. 1.2.4 Deternine the percentage profit from selling one black pen. 1.2.5 Determine the probability of randomly selecting a red pen in one of the boxes (2) that have been bought. (2) Copyright nserved Plinase turn over

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In 2023, if the taxpayer takes the standard mileage rate on his or her Schedule C, he or she can multiply the number of business miles driven by 65.5 cents. The taxpayer can also add amounts paid for which of the following to the total on Line 9? A. Tolls B. Depreciation C. Rent D. Lease payments

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Demand: P = -0.7Q + 800; Supply: P = 0.08Q + 20, where P is the price of crude oil per barrel and Q is the quantity demanded or supplied of crude oil.

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The Army finds that the head sizes (forehead circumference) of soldiers has a normal distribution with a mean of 22.9 inches and a standard deviation of 1.2 inches.

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Higher education is a place where we see some, but not complete, diversification in investment. That is, most colleges require a set of diverse "core" classes, but students must choose and, to some extent, specialize in a specific major. Label each of the following as either a benefit or cost of diversification in college course choice. Your college requires you to take at least one philosophy class. Unfortunately, you loathe philosophy with every ounce of your being. You get a degree that involves using a specific piece of technology. Three years after you get your degree, new technology is invented that makes your job unnecessary. You have to change careers, and your new career uses some skills that you learned in your core classes. Some students may have had to learn to use the slide rule in classes that were unrelated to their major. For some of these students, the electronic calculator would have made the slide rule obsolete even before they finished their degrees. A leading business newspaper recently reported that nursing majors have an unemployment rate of around 2% while clinical psychology majors have an unemployment rate of over 19%. Suppose school officials want to maximize student welfare and view clinical psychology as being a "riskier" major (in terms of getting a job using those skills) than is nursing. Holding all else equal, which of the following would you expect to hold? Clinical psychology majors must take more classes outside of their field than do nursing majors. Nursing and clinical psychology majors take the same number of classes outside of their fields. Clinical psychology majors must take fewer classes outside of their field than do nursing majors.

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