Numerade

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6. The following data were obtained for the gas-phase decomposition of dinitrogen pentoxide, \begin{tabular}{|c|c|} \multicolumn{2}{c|}{$ 2 \mathrm{~N}_{2} \mathrm{O}_{5(g)} \rightarrow 4 \mathrm{NO}_{2(g)}+\mathrm{O}_{2(g)} $} \\ \hline$ \left[\mathrm{N}_{2} \mathrm{O}_{5}\right]_{\circ}(\mathrm{mol} / \mathrm{L}) $ & Initial Rate $ (\mathrm{mol} / \mathrm{L} . \mathrm{s}) $ \\ \hline 0.0750 & $ 8.90 \times 10^{-4} $ \\ \hline 0.190 & $ 2.26 \times 10^{-3} $ \\ \hline 0.275 & $ 3.26 \times 10^{-3} $ \\ \hline 0.410 & $ 4.85 \times 10^{-3} $ \\ \hline \end{tabular} Defining the rate as $ -\frac{\Delta[\mathrm{N} 205]}{\Delta \mathrm{t}} $, write the rate law and calculate the value of the rate constant.

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Find the value of k in the following expression: 4 = e-5k

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Evaluate the definite integral: $ \int_0^9 (6 + \sqrt{81 - x^2}) dx = $ Enter your answer accurately rounded to 3 decimal places.

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15. Two species of the same genus have a different number of chromosomes. Species A has 8 chromosomes, while species B has 22. In which species will one see potentially more genetic variation among the progeny? Why?

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Determine the specific volume for R-410A at these states: a. 15C, 400 kPa b. 20C, 1500 kPa c. 20C, quality 25%

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In order for a food to be labeled as "organic", ______ of the product's ingredients have to meet the USDA regulations.

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4 (B1d) If a cotransduction frequency experiment were conducted to map the distance between hisB and serD, and if cells were grown initially on plates containing serine after the transduction procedure, what would be the transduction frequency of hisB (i.e. as transduction of a single gene)? A 0 B Impossible to estimate because the experiment is selecting for transduction of the serD not hisB C 0.4 D Impossible to estimate for hisB, but would probably depend on the length of the gene 5 (B1e) If the colonies from the serine plate were streaked on a minimal plate, what would be the cotransduction frequency for hisB and serA A: 0 B: 0.25 C:0.66 D: Impossible to determine without more information

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(10 pts) Let A, B and C be sets with the following properties. • $|A| = 50$, $|B| = 25$, $|C| = 24$. • The number of elements that belong to exactly one of the three sets is twice the number that belong to exactly two of the sets. • The number of elements that belong to exactly one of the three sets is three times the number that belong to all of the sets. How many elements belong to all three sets?

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14. An oil refinery finds that it is now necessary to process its waste liquids in a costly treating process before discharging them into a nearby stream. Engineering department estimates that the waste liquid processing will cost $30,000 at the end of the first year. By making process and plant alterations, it is estimated that the waste treatment will decline $3000 each year. As an alternate, a specialized firm, Hydro- Clean, has offered a contract to process the waste liquids for ten years for a fixed price of $15,000 per year, payable at the end of each year. Either way, there should be no need for waste treatment after ten years. If the refinery manager considers 8% a suitable interest rate, should he accept the Hydro-Clean offer or not?

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QUESTION 9 Of the three spectra shown here: Number of rays Energy (keV) ? C is more penetrating than A. ? A is more penetrating than B. ? B is more penetrating than C. ? C is more penetrating than B. QUESTION 10

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francisca n.