Q: Which of the following is the correct formula for calculating molarity?

$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Question 1

Which of the following best describes a strong electrolyte in aqueous solution?

Accepted Answer

A compound that completely dissociates into ions in water.

Question 2

Which equation correctly represents the relationship between pressure, volume, and temperature for an ideal gas?

Accepted Answer

$$P = \frac{nRT}{V}$$

Question 3

A student mixes solutions of silver nitrate and sodium chloride. What type of reaction occurs, and what is the precipitate formed?

Accepted Answer

Precipitation reaction; AgCl is the precipitate.

Question 4

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$\mathrm{H^+ (aq) + OH^- (aq) \rightarrow H_2O (l)}$$

Question 5

A gas sample occupies 2.00 L at 1.00 atm and 300 K. What will its volume be at 2.00 atm and 300 K?

Accepted Answer

1.00 L

Question 6

Which of the following statements about oxidation and reduction is correct?

Accepted Answer

Oxidation is the loss of electrons; reduction is the gain of electrons.

Question 7

Which law states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of each individual gas?

Accepted Answer

Dalton's Law of Partial Pressures

Question 8

Which of the following is a correct application of the concept of limiting reactant in a chemical reaction?

Accepted Answer

The reactant that is completely consumed determines the amount of product formed.

Question 9

Which equation is used to calculate the energy change in a reaction at constant pressure?

Accepted Answer

$$\Delta H = q_p$$

Question 10

A balloon filled with helium at 1.00 atm and 25°C is released and rises to a point where the pressure is 0.50 atm and the temperature is -25°C. What happens to the volume of the balloon?

Accepted Answer

The volume increases due to lower pressure, but the decrease in temperature partially offsets the increase.

Question 11

Which of the following is NOT a property of gases?

Accepted Answer

Gases have definite shape and volume.

Question 12

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 13

Which of the following best explains why ionic compounds conduct electricity when dissolved in water?

Accepted Answer

The ions are free to move and carry charge in solution.

Question 14

Which of the following is a correct statement about the enthalpy change ($$\Delta H) of a $$reaction?

Accepted Answer

$$\Delta H is $$negative for exothermic reactions.

Question 15

Which of the following is the correct expression for the root mean square velocity ($$u_{rms}) of a $$gas molecule?

Accepted Answer

$$u_{rms} = \sqrt{\frac{3RT}{M}}$$

Question 16

Which of the following statements about the van der Waals equation is correct?

Accepted Answer

It accounts for the volume of gas molecules and intermolecular attractions.

Question 17

Which of the following is a correct statement about calorimetry?

Accepted Answer

Calorimetry measures the heat absorbed or released during a chemical reaction.

Question 18

Which of the following is the correct formula for calculating the density of a gas at STP?

Accepted Answer

$$	ext{Density} = \frac{	ext{molar mass}}{22.4\ 	ext{L}}$$

Question 19

Which of the following is a correct statement about the relationship between temperature and kinetic energy of gas molecules?

Accepted Answer

As temperature increases, the average kinetic energy of gas molecules increases.

Question 20

Which of the following is the correct formula for calculating the heat ($$q) $$absorbed or released by a substance?

Accepted Answer

$$q = m c \Delta T$$

Study Guide: Solutions, Gases, and Thermochemistry (CHEM 134 Exam 2)

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