Which membrane resulted in the greatest pressure with $Na^+Cl^–$ as the solute? Why?

Sketch the region of integration for the iterated integral, and reverse the order of integration.

$$\int_{0}^{1} \int_{y^2}^{\sqrt[3]y} f(x,y)\ dx\ dy$$

Jay tossed two coins several times and then recorded the results in the table below. Coin Toss Results

$$\begin{matrix} \text{Toss 1} & \text{Toss 2} & \text{Toss 3} & \text{Toss 4} & \text{Toss 5}\\ \text{H; H} & \text{H; T} & \text{T; H} & \text{T; T} & \text{T; H}\\ \end{matrix}$$

What is the experimental probability that the coins will land on different sides on his next toss? (A) $\frac{1}{5}$ (A) $\frac{2}{5}$ (A) $\frac{3}{5}$ (A) $\frac{4}{5}$

Given that the hull of an experimental boat is to be lifted above the water by a hydrofoil mounted below its keel. The hydrofoil has a shape like that of an airplane wing. Its area projected onto a horizontal surface is $A$. When the boat is towed at sufficiently high speed, the water of density $\rho$ moves in streamlined flow so that its average speed at the top of the hydrofoil is $n$ times larger than its speed $v_b$ below the hydrofoil. The boat has a mass equal to $M$. Show that the liftoff speed is given by

$$v \approx \sqrt{\frac{2 M g}{\left(n^2-1\right) A \rho}}$$

Which of the following molecules is linear $\mathrm{ICl}_2^{-}$, $\mathrm{IF}_2^{+}, \mathrm{OF}_2, \mathrm{SnI}_2$, or $\mathrm{CdBr}_2$.

Suppose $1.00\mathrm{~mol}$ of water evaporates in $1.00$ day. How many water molecules, on average, leave the liquid each second?

Modeling Data The atmospheric pressure decreases with increasing altitude. At sea level, the average air pressure is one atmosphere ($1.033227$ kilograms per square centimeter). The table gives the pressure $p$ (in atmospheres) at a given altitude $h$ (in kilometers).

$$\begin{array}{|c|c|c|c|c|c|c|} \hline h & 0 & 5 & 10 & 15 & 20 & 25 \\ \hline p & 1 & 0.55 & 0.25 & 0.12 & 0.06 & 0.02 \\ \hline \end{array}$$

Find the rate of change of pressure when $h=5$ and $h=20$. Interpret the results in the context of the problem.

Dexter Company uses the direct write-off method. Prepare journal entries to record the following transactions.

Mar. 11 Dexter determines that it cannot collect $45,00O of its accounts receivable from Leer Co.
     29 Leer Co. unexpectedly pays its account in full to Dexter Company. Dexter records its recovery of this bad debt.

At atmospheric pressure, in what phases can $\mathrm{CO}_{2}$ exist?

Many factors affect the price of wine, including such qualitative characteristics as the variety of grape, location of the winery, and label. Researchers developed a regression model considering two quantitative variables: the tasting score of the wine and the age of the wine (in years) when released to the market. They found the following regression equation, with an $R^2$ of $65 \%$, to predict the price (in dollars) of a bottle of wine. Price $=6.25+1.22$ Tasting Score $+0.55 \mathrm{Age}$

One of these interpretations is accurate. Which is it? Describe what is wrong with the others.

b) The price for a bottle of wine increases on average about $\$ .55$ for each year it ages, after allowing for the effects of tasting score.

The reaction between $\mathrm{NO}_2$ and $\mathrm{CO}$ to produce $\mathrm{NO}$ and $\mathrm{CO}_2$ is thought to occur in two steps.

$$\begin{array}{ll} Step ~1: & \mathrm{NO}_2+\mathrm{NO}_2 \stackrel{k_1}{\longrightarrow} \\ Step~ 2: & \mathrm{NO}_3+\mathrm{CO} \stackrel{k_2}{\longrightarrow} \mathrm{NO}_2+\mathrm{CO}_2 \end{array}$$

The experimental rate law is rate $=k\left[\mathrm{NO}_2\right]^2$.

(a) Write the equation for the overall reaction.

(b) Identify the intermediate(s).

(c) Identify the ratedetermining step.

Make the indicated pressure conversions.
a. $699 \mathrm{~mm}$ Hg to atmospheres

Compare the molecules

$$\mathrm { H } _ { 2 } \mathrm { NN } \mathrm { N } \mathrm { H } _ { 2 }$$

and HNNH . Which molecule has the stronger N—N bond?

A dog food company wants to compare a new lower calorie food with their standard dog food to see if it's effective in helping inactive dogs maintain a healthy weight. They have found several dog owners willing to participate in the trial. The dogs have been classified as small, medium, or large breeds, and the company will supply some owners of each size of dog with one of the two foods. The owners have agreed not to feed their dogs anything else for a period of 6 months, after which the dogs' weights will be checked. Identify the treatments, the experimental units, and the response variable.