The acid-catalyzed dehydration of 1-methylcyclohexanol yields a mixture of two alkenes. How could you use 1H NMR to help you decide which was which?

A $3.57 \mathrm{~g}$ sample of a $\mathrm{KCl}-\mathrm{KClO}_3$ mixture is decomposed by heating and produces $119 \mathrm{~mL} \mathrm{O}_2(\mathrm{~g})$, measured at $22.4^{\circ} \mathrm{C}$ and $738 \mathrm{mmHg}$. What is the mass percent of $\mathrm{KClO}_3$ in the mixture?

$$2 \mathrm{KClO}_3(\mathrm{~s}) \longrightarrow 2 \mathrm{KCl}(\mathrm{s})+3 \mathrm{O}_2(\mathrm{~g})$$

Indicate whether each statement is true or false. If you think the statement is false, rewrite it to make it true.

An opaque mixture of two solids could be a homogeneous solution.

Indicate whether combining the following elements yields a compound or a mixture, $\mathrm{N}_{2}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g}) \rightarrow$ air

A mixture of $\mathrm{CS}_2(g)$ and excess $\mathrm{O}_2(g)$ is placed in a $10.0 \mathrm{~L}$ reaction vessel at $100.0{ }^{\circ} \mathrm{C}$ and a pressure of $3.00 \mathrm{~atm}$. A spark causes the $\mathrm{CS}_2$ to ignite, burning it completely, according to the equation

$$\mathrm{CS}_2(g)+3 \mathrm{O}_2(g) \longrightarrow \mathrm{CO}_2(g)+2 \mathrm{SO}_2(g)$$

After reaction, the temperature returns to $100.0^{\circ} \mathrm{C}$, and the mixture of product gases $\left(\mathrm{CO}_2, \mathrm{SO}_2\right.$, and unreacted $\left.\mathrm{O}_2\right)$ is found to have a pressure of $2.40 \mathrm{~atm}$. What is the partial pressure of each gas in the product mixture?

Figure shows shafts of light passing through the mist. Classify the air in this photo as being a solution or heterogeneous mixture. Justify your choice.

The combustion of a 25.0-g gaseous mixture of $\mathrm{H}_2$ and $\mathrm{CH}_4$ releases $2354 \mathrm{~kJ}$ of heat. Calculate the amounts of the gases in grams.

A gaseous mixture contains 400.0 Torr of $\mathrm{H}_{2}(g)$, 355.1 Torr of $\mathrm{N}_{2}(g)$ and 75.2 Torr of Ar(g). Calculate the mole fraction of each of these gases.

Indicate whether each statement is true or false. If you think the statement is false, rewrite it to make it true.

A Bunsen burner is most easily ignited when the gas mixture is rich.

How many milliliters of $0.10 \mathrm{M} \mathrm{NaOH}$ must be added to $0.200 \mathrm{~L}$ of $0.010 \mathrm{M} \mathrm{HCl}$ to give a mixture with a $\mathrm{pH}$ of $3.00$ ?

A mixture of $NaHCO _9$ and $Na _2 CO _9$ has a mass of $2.50 g$. When treated with $HCl ( aq ), 665 mL$ of $CO _2$ gas is liberated with a pressure of $735 mm Hg$ at $25^{\circ} C$. What is the weight percent of $NaHCO _3$ and $Na _2 CO _5$ in the mixture? (See Study Question 93 for the reactions that occur.)

If you had a mixture of proteins with different sizes, shapes, and charges and you separated them with electrophoresis, which proteins would move fastest toward the anode (positive electrode)?

An equilibrium mixture of PCl$_5$ (g), PCl$_3$ (g), and Cl$_2$ (g) has partial pressures of 217.0 Torr, 13.2 Torr, and 13.2 Torr, respectively. A quantity of Cl$_2$ (g) is injected into the mixture, and the total pressure jumps to 263.0 Torr (at the moment of mixing). The system then re-equilibrates. The appropriate chemical equation is:

$$\ce{PCl3 (g) + Cl2 (g) <=> PCl5 (g)}$$

Calculate the new partial pressures after equilibrium is reestablished (in Torr).

When 1.000 mol of $\mathrm{PCl}_5$ is introduced into a $5.000 \mathrm{~L}$ container at $500 \mathrm{~K}, 78.50 \%$ of the $\mathrm{PCl}_5$ dissociates to give an equilibrium mixture of $\mathrm{PCl}_5, \mathrm{PCl}_3$, and $\mathrm{Cl}_2$ :

$$\mathrm{PCl}_5(g) \rightleftharpoons \mathrm{PCl}_3(g)+\mathrm{Cl}_2(g)$$

(a) Calculate the values of $K_{\mathrm{c}}$ and $K_{\mathrm{p}}$.
(b) If the initial concentrations in a particular mixture of reactants and products are $\left[\mathrm{PCl}_5\right]=0.500 \mathrm{M},\left[\mathrm{PCl}_3\right]=0.150 \mathrm{M}$, and $\left[\mathrm{Cl}_2\right]=0.600 \mathrm{M}$, in which direction does the reaction proceed to reach equilibrium? What are the concentrations when the mixture reaches equilibrium?