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

A student mixes solutions of silver nitrate ($$\mathrm{$$AgNO_3$$}) $$and sodium chloride ($$\mathrm{NaCl}). $$What type of reaction occurs, and what is the precipitate formed?

Accepted Answer

Precipitation reaction; $$\mathrm{AgCl}$$

Question 3

Which of the following is the correct net ionic equation for the reaction between hydrochloric acid ($$\mathrm{HCl}) $$and sodium hydroxide ($$\mathrm{NaOH}) in $$aqueous solution?

Accepted Answer

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

Question 4

A 0.250 L solution contains 0.050 mol of $$\mathrm{Na_2SO_4}. $$What is the molarity of the solution?

Accepted Answer

$$0.20\ \mathrm{M}$$

Question 5

Which of the following statements about gases is true according to the kinetic molecular theory?

Accepted Answer

Gas particles are in constant, random motion and collisions are elastic.

Question 6

A sample of gas at STP occupies 22.4 L. How many moles of gas are present?

Accepted Answer

$$1.00\ \mathrm{mol}$$

Question 7

Which equation is used to relate pressure, volume, temperature, and number of moles for an ideal gas?

Accepted Answer

$$PV = nRT$$

Question 8

A mixture of gases contains 2.0 mol $$\mathrm{N_2$}$$, 1.0 mol $$\mathrm{O_2$}$$, and 1.0 mol $$\mathrm{CO_2$} in a 10.0 L $$container at 300 K. What is the partial pressure of $$\mathrm{O_2$} if $$the total pressure is 2.0 atm?

Accepted Answer

$$0.5\ \mathrm{atm}$$

Question 9

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

Accepted Answer

Intermolecular forces become significant.

Question 10

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 11

A balloon filled with helium gas at 1.00 atm and 300 K has a volume of 2.50 L. If the temperature increases to 400 K at constant pressure, what is the new volume?

Accepted Answer

$$3.33\ \mathrm{L}$$

Question 12

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

Accepted Answer

It is the heat absorbed or released at constant pressure.

Question 13

Which of the following is the correct expression for the first law of thermodynamics?

Accepted Answer

$$\Delta E = q + w$$

Question 14

A coffee cup calorimeter is used to measure the heat of reaction at constant pressure. If 50.0 g of water absorbs 418 J of heat, what is the temperature change? ($$c = 4.18\ \mathrm{J/g\cdot K})$$

Accepted Answer

$$1.00\ \mathrm{K}$$

Question 15

Which of the following is NOT a state function?

Accepted Answer

Work ($$w)$$

Question 16

Which of the following is a correct application of Hess's Law?

Accepted Answer

The enthalpy change of a reaction is independent of the pathway taken.

Question 17

Which of the following best describes the role of catalysts in chemical reactions?

Accepted Answer

Catalysts lower the activation energy, increasing the reaction rate.

Question 18

Which of the following is a correct statement about the environmental impact of fossil fuel combustion?

Accepted Answer

It releases $$\mathrm{CO_2$}$$, contributing to global warming.

Question 19

Which of the following is a technological action plan for addressing excessive $$\mathrm{CO_2$} in $$the atmosphere?

Accepted Answer

Developing carbon capture and storage technologies.

Question 20

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

Accepted Answer

It accounts for the nonzero volume of gas particles and intermolecular forces.

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

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