Indicate which of the following errors, each considered individually, would cause the trial balance totals to be unequal:

a. A fee of $21,000 earned and due from a client was not debited to Accounts Receivable or credited to a revenue account, because the cash had not been received.

Indicate which of the preceding errors would require a correcting entry

During which of the following changes of state do atoms or molecules become more ordered? a. boiling b. condensation c. melting d. sublimation

Sketch the region of integration and write an equivalent integral with the order of integration reversed.

$$\int_{0}^{1} \int_{x}^{2-x} f(x, y) d y \ d x$$

What happ ens to water molecules when water is heated from $90^{\circ} \mathrm{C}$ to $110^{\circ} \mathrm{C}$?

Which of the following molecules is (are) not polar? For each polar molecule, indicate the direction of polarity-that is, which is the negative end and which is the positive end.\

$$CO$$

Why does the temperature at which a liquid boils depend on atmospheric pressure?

Which of the following molecules is a dipole?

(a) $\mathrm{HBr}$
(b) $\mathrm{CH}_4$
(c) $\mathrm{H}_2$
(d) $\mathrm{CO}_2$

How many grams of carbon molecules are in $1 \mathrm{~mol}$ of ethanol, $\mathrm{C}_2 \mathrm{H}_6 \mathrm{O}$?

Suggest why $\mathrm{Be}^{2+}$ has a higher affinity for $\mathrm{H}_2 \mathrm{O}$ molecules than $\mathrm{Mg}^{2+}$.

Phytosterols can alter absorption of certain molecules by the intestinal tract. Why would they be a beneficial dietary supplement for people with high LDL levels?

Make the indicated pressure conversions.
d. $99,436 \mathrm{~Pa}$ to kilopascals

Steam flows steadily through an adiabatic turbine. The inlet conditions of the stcam are $6 \mathrm{~MPa}, 400^{\circ} \mathrm{C}$, and $80 \mathrm{~m} / \mathrm{s}$, and the exit conditions are $40 \mathrm{~kPa}, 92$ percent quality, and $50 \mathrm{~m} / \mathrm{s}$. The mass flow rate of the stcam is $20 \mathrm{~kg} / \mathrm{s}$. Find $(a)$ the change in kinetic energy, $(b)$ the power output, and $(c)$ the turbine inlet aread.

Select the best choice for each of the following:

a. Higher $\mathrm{N}-\mathrm{O}$ stretching frequency:

$$\left[\mathrm{Fe}(\mathrm{NO})(\mathrm{mnt})_2\right]^{-}\left[\mathrm{Fe}(\mathrm{NO})(\mathrm{mnt})_2\right]^{2^{-}}$$

b. Longest $\mathrm{N}-\mathrm{N}$ bond:

$$\mathrm{N}_2$$

$$(\mathrm{CO})_5 \mathrm{Cr}: \mathrm{N} \equiv \mathrm{N}$$

$$(\mathrm{CO})_5 \mathrm{Cr}: \mathrm{N} \equiv \mathrm{N}: \mathrm{Cr}(\mathrm{CO})_5$$

c. Shorter $\mathrm{Ta}-\mathrm{C}$ distance in $\left(\eta^5-\mathrm{C}_5 \mathrm{H}_5\right)_2 \mathrm{Ta}\left(\mathrm{CH}_2\right)\left(\mathrm{CH}_3\right):$

$$\mathrm{Ta}-\mathrm{CH}_2$$

$$\mathrm{Ta}-\mathrm{CH}_3$$

d. Shortest $\mathrm{Cr}-\mathrm{C}$ distance: $\mathrm{Cr}(\mathrm{CO})_6$ $\mathrm{Cr}-\mathrm{CO}$ in trans $-\mathrm{Cr}(\mathrm{CO})_4 \mathrm{I}\left(\mathrm{CCH}_3\right)$ $\mathrm{Cr}-\mathrm{CCH}_3$ in trans $-\mathrm{Cr}(\mathrm{CO})_4 \mathrm{I}\left(\mathrm{CCH}_3\right)$

e. Lowest $\mathrm{C}-\mathrm{O}$ stretching frequency:

$$\mathrm{Ni}(\mathrm{CO})_4$$

$$\left[\mathrm{Co}(\mathrm{CO})_4\right]^{-}$$

$$\left[\mathrm{Fe}(\mathrm{CO})_4\right]^{2-}$$

How many molecules of aspirin,

$$\mathrm { C } _ { 9 } \mathrm { H } _ { 8 } \mathrm { O } _ { 4 }$$

, are there in a 100.0 mg tablet of aspirin?