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

$$q = m \times C_s \times \Delta T$$

Q: Which of the following is a redox reaction?

$$2\text{H}_2 + \text{O}_2 \rightarrow 2\text{H}_2\text{O}$$

Q: Which of the following is the correct formula for calculating the standard enthalpy change of a reaction?

$$\Delta H_{rxn}^\circ = \sum n_p \Delta H_f^\circ (\text{products}) - \sum n_r \Delta H_f^\circ (\text{reactants})$$

Q: A sample of gas effuses through a small hole in 10 minutes. How long would it take for a gas with twice the molar mass to effuse the same amount?

10 \times \sqrt{2} = 14.1 minutes

Q: Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

$$M = \frac{\text{mol solute}}{\text{L solution}}$$

Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which two aqueous solutions combine to form an insoluble solid.

Question 2

Given the reaction: $$2	ext{NaOH} + 	ext{H}_2	ext{SO}_4 ightarrow 	ext{Na}_2	ext{SO}_4 + 2	ext{H}_2	ext{O}$$, what type of reaction is this?

Accepted Answer

Acid-base neutralization

Question 3

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

Accepted Answer

$$q = m 	imes C_s 	imes \Delta T$$

Question 4

A student mixes 50.0 mL of 1.0 M AgNO$$_3$$ with 50.0 mL of 1.0 M NaCl. What mass of AgCl will precipitate? ($$M_{AgCl} = 143.32 	ext{ g/mol})$$

Accepted Answer

3.58 g

Question 5

Which of the following equations correctly relates the change in internal energy ($$\Delta E) to $$heat ($$q) $$and work ($$w$$)?

Accepted Answer

$$\Delta E = q + w$$

Question 6

A gas occupies 2.00 L at 1.00 atm and 300 K. What will its volume be at 2.00 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

1.00 L

Question 7

Which of the following metals will react most vigorously with water?

Accepted Answer

Potassium (K)

Question 8

Which of the following is the correct expression for the kinetic energy of a gas molecule?

Accepted Answer

$$KE = \frac{1}{2} m u^2$

Question 9

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

Accepted Answer

0.50 M

Question 10

Which of the following is the correct formula for calculating the partial pressure of a gas in a mixture?

Accepted Answer

$$P_A = X_A 	imes P_{total}$$

Question 11

Which of the following is a redox reaction?

Accepted Answer

$$2	ext{H}_2 + 	ext{O}_2 ightarrow 2	ext{H}_2	ext{O}$$

Question 12

A 100.0 g sample of water is heated from 25.0°C to 75.0°C. How much heat is absorbed? ($$C_s$$ for water = $$4.184 	ext{ J/g}^\circ	ext{C})$$

Accepted Answer

20,920 J

Question 13

Which of the following statements about state functions is correct?

Accepted Answer

State functions depend only on the initial and final states, not on the path taken.

Question 14

Which equation correctly relates the pressure, volume, and temperature of an ideal gas?

Accepted Answer

$$PV = nRT$$

Question 15

A 2.0 L container holds 0.10 mol of O$$_2$$ gas at 300 K. What is the pressure inside the container? ($$R = 0.08206 	ext{ L atm/mol K})$$

Accepted Answer

1.23 atm

Question 16

Which of the following is the correct formula for calculating the standard enthalpy change of a reaction?

Accepted Answer

$$\Delta H_{rxn}^\circ = \sum n_p \Delta H_f^\circ (	ext{products}) - \sum n_r \Delta H_f^\circ (	ext{reactants})$$

Question 17

Which of the following statements about strong acids is correct?

Accepted Answer

Strong acids completely ionize in aqueous solution.

Question 18

A sample of gas effuses through a small hole in 10 minutes. How long would it take for a gas with twice the molar mass to effuse the same amount?

Accepted Answer

10 	imes \sqrt{2} = 14.1 minutes

Question 19

Which of the following is the correct formula for calculating the average kinetic energy of a gas molecule?

Accepted Answer

$$KE_{avg} = \frac{3}{2} kT$$

Question 20

Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

Accepted Answer

$$M = \frac{	ext{mol solute}}{	ext{L solution}}$$

General Chemistry Exam 2 Study Guide: Thermochemistry, Gas Laws, and Reactivity

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