Silicon is the second most abundant element in the Earth's crust, and its compounds can be as ordinary as beach sand. However, silicon also plays an indispensable role in modern devices such as computers, cell phones, semiconductors, and solar panels. A recent technology incorporates silicon in nanometer-sized particles called quantum dots that act as luminescent labels for pancreatic cancer cells. Identify the electron configuration of a silicon atom.

What is job enrichment and what has led to its importance in job design ?

Design a controlled experiment to determine whether earthworms are more attracted to perfume or to vinegar.

For the underlined phrase or sentence, choose the revision that most improves the writing. A single green tear drops from one eye. $\underline{\text{This poignant design is often reprinted.}}$ A. As a result, this poignant design is often reprinted. B. Because this poignant design beautifully reflects the book's content, it is often reprinted on modern editions. C. Cugat often reprints this poignant design. D. Correct as is

How can you determine whether there is an interaction in the two-factor factorial design?

In many of the world’s poorest countries, nearly 50 percent of the population is under 15 years of age. If these people are to help improve the productivity of their economies, they must be trained in modern methods of production. In 2000, just over 4 million of the 8.8 million people of Chad were under 15. Explain why it would be difficult for many of these children to be educated and become productive members of a growing economy.

The mailroom employees send all remittances and remittance advices to the cashier. The cashier deposits the cash in the bank and forwards the remittance advices and duplicate deposit slips to the Accounting Department.

a. Indicate the weak link in internal control in the handling of cash receipts.

b. How can the weakness be corrected?

Listed below are nine technical accounting terms:

$$\begin{array}{lll}\text { Variable costs } & \text { Relevant range } & \text { Contribution margin } \\ \text { Break-even point } & \text { Fixed costs } & \text { Semivariable costs } \\ \text { Economies of scale } & \text { Sales mix } & \text { Unit contribution margin }\end{array}$$

Each of the following statements may (or may not) describe one of these technical terms. For each statement, indicate the accounting term described, or answer "None" if the statement does not correctly describe any of the terms.

g. Costs that respond to changes in sales volume by less than a proportionate amount.

Insert a colon where necessary. If the sentence is correct, write C in the blank.
______The most popular sports in the United States are football, basketball, and baseball.

A modern jet engine Operates so that the fuel is sprayed into air at P, tighter than the fuel critical point. Assume we have a rich mixture of 50% n-octane and 50% air by moles at 500 K and 3.5 MPa near the nozzle exit. Do I need to treat this as a real-gas mixture, or is an ideal-gas assumption reasonable? To answer, find Z and the enthalpy departure for the mixture assuming Kay's rule and the generalized charts.

(a) Recall: What connections does Rodriguez draw between Addison's London and modern-day Tijuana?
(b) Recall: As a journalist, in what way must Rodriguez present the border town of Tijuana?
(c) Speculate: Because of th e parallels Rodriguez notes between him self and Tijuana, do you think he can be objective in his presentation of the city? Why or why not?

The United States Capitol Rotunda is a circular room located in the Capitol Building in Washington, D.C. The radius of the room is 48 feet. What is its circumference?

The production of forages in the United States equals $\rule{1cm}{1pt}$ percent of the land used for crops.
a. $25$
b. $35$
c. $50$\ d. $65$

Indicate whether each of the following statements concerning diabetes and the chemical monitoring of this condition is true or false. a. Diabetes results from having too much insulin in the blood. b. The inability of the body to properly use insulin once it is produced is a cause of diabetes. c. High levels of glucose in urine is a sign of diabetes. d. Modern glucose-monitoring systems directly measure the amount of glucose in the blood.