Question 1

Which of the following best describes the role of $$\mathrm{H_2SO_4} in $$the reaction:

$$\mathrm{Ca($$HCO_3$$)_2(aq) + H_2SO_4(aq) \rightarrow $$CaSO_4$$(s) + 2H_2CO_3(aq)}$$?

Accepted Answer

It provides sulfate ions to precipitate calcium as $$\mathrm{$$CaSO_4$$}.$$

Question 2

A 5.00 L rigid container at $$55.0\ ^\circ\mathrm{C}$$ contains 4.0 g of $$\mathrm{O_2$}$$ and 8.0 g of $$\mathrm{N_2$}. $$What is the total pressure in the container? (Use $$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$2.8\ \mathrm{atm}$$

Question 3

Which of the following statements about the kinetic molecular theory of gases is FALSE?

Accepted Answer

Gas particles lose energy during elastic collisions.

Question 4

A mixture contains 2.0 moles of $$\mathrm{H_2$}$$ and 1.0 mole of $$\mathrm{O_2$} in a 2.0 L $$container at 298 K. What is the partial pressure of $$\mathrm{H_2$}$$? ($$R = 0.0821\ \mathrm{L\ atm\ $$mol^{-1}$$\ K$$^{-1}$$})$$

Accepted Answer

$$24.4\ \mathrm{atm}$$

Question 5

Which gas will have the highest average molecular speed at the same temperature?

Accepted Answer

$$\mathrm{H_2$}$$

Question 6

A sample of gas occupies 5.0 L at 1.0 atm and 300 K. If the pressure is doubled and the temperature is increased to 600 K, what is the new volume?

Accepted Answer

$$2.5\ \mathrm{L}$$

Question 7

Which of the following best explains why $$\mathrm{$$CaSO_4$$}$$ precipitates when $$\mathrm{H_2SO_4} is $$added to a solution of $$\mathrm{Ca($$HCO_3$$)_2}$$?

Accepted Answer

The solubility product ($$K_{sp}) of$$ $$\mathrm{$$CaSO_4$$} is $$exceeded.

Question 8

A 2.0 L container holds a mixture of $$\mathrm{N_2$}$$ and $$\mathrm{O_2$} at a $$total pressure of 1.0 atm. If the partial pressure of $$\mathrm{N_2$} is 0.7 $$atm, what is the mole fraction of $$\mathrm{O_2$}$$?

Accepted Answer

$$0.3$$

Question 9

Which of the following changes will increase the rate of effusion of a gas through a small hole?

Accepted Answer

Decreasing the molar mass of the gas.

Question 10

A rigid 10.0 L container at 300 K contains 2.0 moles of $$\mathrm{CO_2$}. $$What is the pressure inside the container?

Accepted Answer

$$4.92\ \mathrm{atm}$$

Question 11

Which of the following is TRUE about the average kinetic energy of gas molecules?

Accepted Answer

It is the same for all gases at the same temperature.

Question 12

A mixture of $$\mathrm{NO}$$ and $$\mathrm{O_2$} is $$placed in a container and allowed to react:

$$2\mathrm{NO}(g) + \mathrm{O_2$}(g) \rightarrow 2\mathrm{NO_2$}(g)

If $$the initial partial pressures are $$P_{NO} = 1.0\ \mathrm{atm}$$ and $$P_{O_2$} = 0.5\ \mathrm{atm}$$, what is the limiting reactant?

Accepted Answer

$$\mathrm{O_2$}$$

Question 13

Which of the following best describes the effect of increasing temperature on the pressure of a fixed amount of gas in a rigid container?

Accepted Answer

The pressure increases.

Question 14

A sample of $$\mathrm{CO_2$}$$ gas effuses at a rate of 0.20 mol/min. At the same temperature and pressure, what is the expected rate of effusion for $$\mathrm{H_2$}$$ gas?

Accepted Answer

$$1.90\ \mathrm{mol/min}$$

Question 15

Which of the following is NOT an assumption of the ideal gas law?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 16

A 1.0 L flask contains 0.10 mol of $$\mathrm{HCl}$$ and 0.05 mol of $$\mathrm{$$CaCO_3$$}. $$What is the limiting reactant in the reaction:

$$2\mathrm{HCl}(aq) + \mathrm{$$CaCO_3$$}(s) \rightarrow \mathrm{$$CaCl_2$$}(aq) + \mathrm{CO_2$}(g) + \mathrm{H_2O}(l)$$?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 17

Which of the following best explains why real gases deviate from ideal behavior at high pressures?

Accepted Answer

The volume of gas particles becomes significant.

Question 18

A mixture of gases contains 2.0 moles of $$\mathrm{CO}$$, 1.0 mole of $$\mathrm{O_2$}$$, and 3.0 moles of $$\mathrm{N_2$} in a 10.0 L $$container at 300 K. What is the total pressure?

Accepted Answer

$$14.8\ \mathrm{atm}$$

Question 19

Which of the following statements is TRUE regarding the diffusion of gases?

Accepted Answer

Lighter gases diffuse faster than heavier gases.

General Chemistry Study Notes: Chemical Reactions and Gases

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