In the gas phase, phosphorus pentachloride exists as separate molecules. In the solid phase, however, the compound is composed of alternating PC4+ and PCl6- ions. What change(s) in molecular shape occur(s) as PCI5 solidifies? How does the Cl-P-Cl angle change?

Water is released from a 0.8-m-deep reservoir into a 4-m-wide open channel through a sluice gate with a 0.1-m-high opening at the channel bottom. The flow depth after all turbulence subsides is 0.5 m. The rate of discharge is $(a) 0.92 m^3/s\ (b) 0.79 m^3/s\ (c) 0.66 m^3/s\ (d) 0.47 m^3/s\ (e) 0.34 m^3/s$

A music download website charges its non-members a $2.50 fee to download plus$1.25 for every song. The total download fee (f) for non-members is a function of the number of downloads (n):

$$f = \$ 2.50 + \$ 1.25 n$$

. Create a table of prices for the first 6 downloads.

Use condensed electron configurations and Lewis electron-dot symbols to depict the ions formed from each of the following atoms, and predict the formula of their compound:

Ba and Cl,

Draw the Lewis structure with lowest formal charges, and determine the charge of each atom in

CN-

The article “Variance Reduction Techniques: Experimental Comparison and Analysis for Single Systems” describes a study of the effectiveness of the method of Latin Hypercube Sampling in reducing the variance of estimators of the mean time-in-system for queueing models. For the M/M/1 queueing model, ten replications of the experiment yielded an average reduction of 6.1 with a standard deviation of 4.1. For the serial line model, ten replications yielded an average reduction of 6.6 with a standard deviation of 4.3. Can you conclude that the mean reductions differ between the two models?

The article “Variance Reduction Techniques: Experimental Comparison and Analysis for Single Systems” (I. Sabuncuoglu, M. Fadiloglu, and S. Celik, IIE Transactions, 2008:538-551) describes a study of methods for reducing variance in estimators of the mean inventory on hand for a standard inventory model. Ten replications of an experiment using the method of antithetic variates yielded an average reduction of 10.7% with a standard deviation of 4.1%. Can you conclude that the mean reduction for this method is greater than 10%?

The article “Mechanical Grading of Oak Timbers” (D. Kretschmann and D. Green, Journal of Materials in Civil Engineering, 1999:91-97) presents measurements of the ultimate compressive stress, in MPa, for green mixed oak 7 by 9 timbers from West Virginia and Pennsylvania. For 11 specimens of no. 1 grade lumber, the average compressive stress was 22.1 with a standard deviation of 4.09. For 7 specimens of no. 2 grade lumber, the average compressive stress was 20.4 with a standard deviation of 3.08. Can you conclude that the mean compressive stress is greater for no. 1 grade lumber than for no. 2 grade?

Two machines used to fill soft drink containers are being compared. The number of containers filled each minute is counted for 60 minutes for each machine. During the 60 minutes, machine 1 filled an average of 73.8 cans per minute with a standard deviation of 5.2 cans per minute, and machine 2 filled an average of 76.1 cans per minute with a standard deviation of 4.1 cans per minute. a. If the counts are made each minute for 60 consecutive minutes, what assumption necessary to the validity of a hypothesis test may be violated? b. Assuming that all necessary assumptions are met, perform a hypothesis test. Can you conclude that machine 2 is faster than machine 1?

Some people are guessing the number of jelly beans in a jar. Each person who guesses within 15 of the correct number will win a prize. The correct number of jelly beans is 389. What values of n represent the numbers that will win a prize? F. n = 389 or n = 404, G. n = 389 and n = 404, H. 389 ≤ n ≤ 404, I. 374 ≤ n ≤ 404

The article “Wired: Energy Drinks, Jock Identity, Masculine Norms, and Risk Taking” reports that in a sample of 413 male college students, the average number of energy drinks consumed per month was 2.49 with a standard deviation of 4.87, and in a sample of 382 female college students, the average was 1.22 with a standard deviation of 3.24. Can you conclude that the mean number of energy drinks is greater for male students than for female students?

In a test to compare the effectiveness of two drugs designed to lower cholesterol levels, 75 randomly selected patients were given drug A and 100 randomly selected patients were given drug B. Those given drug A reduced their cholesterol levels by an average of 40 with a standard deviation of 12, and those given drug B reduced their levels by an average of 42 with a standard deviation of 15. The units are milligrams of cholesterol per deciliter of blood serum. Can you conclude that the mean reduction using drug B is greater than that of drug A?

Arrange the following AFn species in order of increasing F - A - F bond angles: BF3, BeF2, CF4, NF3, OF2.

What is a real world application of a colligative property?