$$M = \frac{0.50\ \text{mol}}{1.0\ \text{L}} = 0.50\ \text{M}$$

$$\text{Ag}^+ (aq) + \text{Cl}^- (aq) \rightarrow \text{AgCl} (s)$$

$$V_1$$ = \frac{$$C_2$$ $$V_2$$}{$$C_1$$} = \frac{0.10\ \text{M} \times 250\ \text{mL}}{1.0\ \text{M}} = 25\ \text{mL}$$

$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{1.0\ \text{atm} \times 2.0\ \text{L}}{4.0\ \text{atm}} = 0.5\ \text{L}$$

Question 1

Which of the following statements best describes a strong electrolyte?

Accepted Answer

A substance that dissociates completely into ions in water, resulting in high electrical conductivity.

Question 2

A solution is prepared by dissolving 0.50 mol of NaCl in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{0.50\ 	ext{mol}}{1.0\ 	ext{L}} = 0.50\ 	ext{M}$$

Question 3

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of AgNO$$_3$$ and NaCl?

Accepted Answer

$$	ext{Ag}^+ (aq) + 	ext{Cl}^- (aq) ightarrow 	ext{AgCl} (s)$$

Question 4

Which ion is a spectator ion in the reaction between K$$_2SO$_4$$ and Ba(NO$$_3$$)$$_2 in $$aqueous solution?

Accepted Answer

$$	ext{K}^+$$

Question 5

Which of the following best describes an Arrhenius acid?

Accepted Answer

A substance that increases the concentration of H$$^+$$ ions in aqueous solution.

Question 6

A chemist needs to prepare 250 mL of a 0.10 M NaOH solution from a stock solution of 1.0 M NaOH. What volume of stock solution should be used?

Accepted Answer

$$V_1$$ = \frac{$$C_2$$ $$V_2$$}{$$C_1$$} = \frac{0.10\ 	ext{M} 	imes 250\ 	ext{mL}}{1.0\ 	ext{M}} = 25\ 	ext{mL}$$

Question 7

In a redox reaction, which statement is true about oxidation?

Accepted Answer

Oxidation is the loss of electrons by a substance.

Question 8

A sample of gas occupies 2.0 L at 1.0 atm. If the pressure is increased to 4.0 atm at constant temperature, what will be the new volume?

Accepted Answer

$$V_2$$ = \frac{$$P_1$$ $$V_1$$}{$$P_2$$} = \frac{1.0\ 	ext{atm} 	imes 2.0\ 	ext{L}}{4.0\ 	ext{atm}} = 0.5\ 	ext{L}$$

Question 9

Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?

Accepted Answer

Charles's Law

Question 10

A mixture of gases contains 2.0 mol O$$_2$$, 1.0 mol N$$_2$$, and 3.0 mol CO$$_2. $$What is the mole fraction of CO$$_2$$?

Accepted Answer

$$X_{CO_2$} = \frac{3.0}{2.0 + 1.0 + 3.0} = \frac{3.0}{6.0} = 0.50$$

Question 11

Which equation represents the Ideal Gas Law?

Accepted Answer

$$PV = nRT$$

Question 12

At STP, what is the molar volume of an ideal gas?

Accepted Answer

$$22.4\ 	ext{L}$$

Question 13

Which statement about vapor pressure is correct?

Accepted Answer

Vapor pressure is the pressure exerted by a vapor in equilibrium with its liquid at a given temperature.

Question 14

According to the kinetic molecular theory, which statement is true about gas particles?

Accepted Answer

Gas particles move in straight lines and collisions are elastic.

Question 15

Which equation describes the relationship between energy, work, and heat according to the First Law of Thermodynamics?

Accepted Answer

$$\Delta E = q + w$$

Question 16

Which of the following is an example of an exothermic reaction?

Accepted Answer

Combustion of gasoline in a car engine.

Question 17

A metal sample absorbs 150 J of heat and its temperature increases by 5.0 K. If the mass of the sample is 10.0 g, what is its molar heat capacity?

Accepted Answer

$$C = \frac{q}{m \Delta T} = \frac{150\ 	ext{J}}{10.0\ 	ext{g} 	imes 5.0\ 	ext{K}} = 3.0\ 	ext{J/g K}$$

Question 18

Which principle allows calculation of the enthalpy change for a reaction by combining enthalpy changes of multiple reactions?

Accepted Answer

Hess's Law

Question 19

Which quantum number determines the energy level (shell) of an electron in the Bohr model?

Accepted Answer

Principal quantum number ($$n)$$

General Chemistry II: Solutions, Gases, Thermochemistry, and Quantum Theory

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