Study the entries and answer the questions that follow. The root phon means "sound." The prefix tele means "afar" or "at a distance." The root put means "to clean," "to prune," or "to reckon." A battlefield surgeon might want to _____ someone's infected limb, but someone who does not think that the operation is necessary might _____ the doctor's decision.

Hard water often contains various amounts of metallic substances. Which of the following ions does NOT contribute to hard water? A. calcium B. iron C. magnesium D. sodium

Ammonium nitrate has been used as a high explosive because it is unstable and decomposes into several gaseous substances. The rapid expansion of the gaseous substances produces the explosive force.

$$\mathrm{NH}_4\mathrm{NO}_3(s) \rightarrow \mathrm{N}_2(g)+\mathrm{O}_2(g)+\mathrm{H}_2\mathrm{O}(g)$$

Calculate the mass of each product gas if $1.25\mathrm{~g}$ of ammonium nitrate reacts.

Consider the graph shown below of a compression wave. Shown are snapshots of the wave function for $t=0.000 \mathrm{~s}$ (blue) and $t=0.005 \mathrm{~s}$ (orange). What are the wavelength, maximum displacement, velocity, and period of the compression wave?

A bottle of acid solution is labeled "$3~M\mathrm{~HNO}_3$." What are the substances that are actually present in the solution? Are any $\mathrm{HNO}_3$ molecules present? Why or why not?

The minute hand of a wall clock measures 10 cm from its tip to the axis about which it rotates. The magnitude and angle of the displacement vector of the tip are to be determined for three time intervals. What is the angle for the next half hour ?

A particle moves in a straight line with the given velocity (in meters per second). Find the displacement and distance traveled over the time interval, and draw a motion diagram (with distance and time labels).

$$v ( t ) = t ^ { - 2 } - 1 , \quad [ 0.5,2 ]$$

An ant starts at $x=20 \mathrm{~cm}$ on a piece of graph paper and walks along the $x$ axis to $x=-20 \mathrm{~cm}$. It then turns around and walks back to $x=-10 \mathrm{~cm}$. Find (a) the ant's displacement and (b) the total distance travelled.

A corporation has three factories, each of which manufactures acoustic guitars and electric guitars. The number of units of guitars produced at factory in one day is represented by $a_{i j}$ in the matrix

$$A=\left[\begin{array}{rrr} 70 & 50 & 25 \\ 35 & 100 & 70 \end{array}\right]$$

. Find the production levels if production is increased by 20%.

The steps to memory can best be described as follows: a. finding it, using it, storing it, using it again. b. putting it in, keeping it in, getting it out. c. sensing it, perceiving it, remembering it, forgetting it. d. a series of passive data files.

Using information from this chapter, indicate whether substances such as $\mathrm{Li}_2 \mathrm{SO}_4$ in aqueous solution is a nonelectrolyte, weak electrolyte, or strong electrolyte.

Which of the following are paired incorrectly? a. Cochlear duct-cupula b. Vestibule-macula c. Ampulla-otoliths d. Semicircular duct-ampulla

On the basis of the general solubility rules given in Table 7.1, predict which of the following substances are likely to be soluble in water.

g. iron(III) chloride, $\text{FeCl}_3$

Which compound in each of the following pairs of ionic substances has the most exothermic lattice energy? Justify your answers. $\mathrm{NaCl}, \mathrm{Na}_{2} \mathrm{O}$