One of these two substances is a liquid at room temperature. Which one and why?

$$\mathrm{CH}_3 \mathrm{OH} \quad \mathrm{CH}_3 \mathrm{SH}$$

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

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

The function D(p) gives the number of items that will be demanded when the price is p. The production cost C(x) is the cost of producing x items. To determine the cost of production when the price is $6, you would do which of the following? a. Evaluate D(C(6)). b. Evaluate C(D(6)). c. Solve D(C(x)) = 6. d. Solve C(D(p)) = 6.

Given $\vec{v} = 3\vec{i} + 4\vec{j}$ and force vector $\vec{F}$, find:

(c ) The work, $W$, done by force $\vec{F}$ through displacement $\vec{v}.$

$$\vec{F} = 9\vec{i} + 12\vec{j}$$

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.

One of these two substances is a liquid at room temperature. Which one and why?

$$\mathrm{CH}_3 \mathrm{OCH}_3 \quad \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}$$

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?

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, $\text{FeCl}_3$

Identify the conjugate acid of each of the following substances. (a) $\mathrm{NH}_3$ (c) $\mathrm{HSO}_3^{-}$ (b) $\mathrm{OH}^{-}$ (d) $\mathrm{CO}_3^{2-}$

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.

Write the simplest formula for each of the following substances, listing the elements in the order given.

b. a compound containing one aluminum atom for every three chlorine atoms

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.

Match the description on the left to its term on the right.