Question 1

A student mixes aqueous solutions of silver nitrate and sodium chloride. A white precipitate forms. Which of the following best describes the type of reaction and the net ionic equation?

Accepted Answer

This is a redox reaction; net ionic equation: $$\mathrm{Ag^+ (aq) + Cl^- (aq) \rightarrow AgCl (s)}$$

Question 2

Which of the following solutions will have the highest boiling point? Assume all solutions are made by dissolving 1.0 mol of solute in 1.0 kg of water.

Accepted Answer

Sodium sulfate, $$\mathrm{Na_2SO_4}$$

Question 3

A 50.0 g sample of water at $$25.0\ ^\circ\mathrm{C}$$ absorbs 4184 J of heat. What is the final temperature of the water? ($$C_{\mathrm{H_2O}} = 4.184\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$35.0\ ^\circ\mathrm{C}$$

Question 4

Which of the following best describes the process occurring when hydrochloric acid reacts with sodium hydroxide?

Accepted Answer

A neutralization reaction producing water and a salt

Question 5

A 2.00 L container holds $$0.50$$ mol of $$\mathrm{O_2$}$$ gas at $$27.0\ ^\circ\mathrm{C}. $$What is the pressure in the container? ($$R = 0.08206\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$6.15\ \mathrm{atm}$$

Question 6

Which of the following metals will react with hydrochloric acid to produce hydrogen gas, based on the reactivity series provided?

Accepted Answer

Zinc

Question 7

A sample of gas occupies $$4.00\ \mathrm{L} at$$ $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. $$What will be its volume at $$2.00\ \mathrm{atm}$$ and $$400\ \mathrm{K}$$?

Accepted Answer

$$2.67\ \mathrm{L}$$

Question 8

Which of the following statements about state functions is correct?

Accepted Answer

Enthalpy ($$\Delta H) is a $$state function, but work ($$w) is $$not.

Question 9

A solution is prepared by dissolving $$0.10$$ mol of $$\mathrm{NaCl} in$$ $$1.0 L of $$water. What is the molarity of the solution?

Accepted Answer

$$0.10\ \mathrm{M}$$

Question 10

Which of the following best explains why $$\mathrm{CO_2$} is $$considered a non-electrolyte in water?

Accepted Answer

$$\mathrm{CO_2$}$$ does not produce ions when dissolved in water.

Question 11

A $$25.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ $$\mathrm{HCl} is $$titrated with $$0.100\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$50.0\ \mathrm{mL}$$

Question 12

Which of the following is the correct balanced molecular equation for the reaction between aqueous potassium sulfate and barium nitrate?

Accepted Answer

$$\mathrm{K_2SO_4 (aq) + Ba(NO_3$)_2 (aq) \rightarrow 2KNO_3 (aq) + $$BaSO_4$$ (s)}$$

Question 13

A $$10.0\ \mathrm{g}$$ sample of a metal at $$100.0\ ^\circ\mathrm{C} is $$placed in $$50.0\ \mathrm{g} of $$water at $$20.0\ ^\circ\mathrm{C}. $$The final temperature is $$22.0\ ^\circ\mathrm{C}. $$What is the specific heat capacity of the metal? ($$C_{\mathrm{H_2O}} = 4.184\ \mathrm{J/g\ ^\circ C})$$

Accepted Answer

$$0.105\ \mathrm{J/g\ ^\circ C}$$

Question 14

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

Accepted Answer

$$\mathrm{CO_3$^{2-} (aq) + 2H^+ (aq) \rightarrow CO_2$ (g) + H_2O (l)}$$

Question 15

A $$5.00\ \mathrm{g}$$ sample of helium gas is stored in a $$10.0\ \mathrm{L}$$ container at $$25.0\ ^\circ\mathrm{C}. $$What is the pressure in the container? ($$R = 0.08206\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$}$$, $$M_{\mathrm{He}} = 4.00\ \mathrm{g/mol})$$

Accepted Answer

$$2.49\ \mathrm{atm}$$

Question 16

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

Accepted Answer

Gas particles lose energy during elastic collisions.

Question 17

Which of the following is the correct formula for calculating the standard enthalpy change of a reaction ($$\Delta H_{\mathrm{rxn}}^\circ$$)?

Accepted Answer

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

Question 18

A $$0.250\ \mathrm{mol}$$ sample of nitrogen gas effuses through a porous barrier in $$50.0\ \mathrm{min}. $$How long would it take the same amount of oxygen gas to effuse under identical conditions? ($$M_{\mathrm{N_2$}} = 28.0\ \mathrm{g/mol}$$, $$M_{\mathrm{O_2$}} = 32.0\ \mathrm{g/mol})$$

Accepted Answer

$$53.4\ \mathrm{min}$$

Question 19

Which of the following best describes the change in internal energy ($$\Delta E) $$for a system that absorbs $$100\ \mathrm{J} of $$heat and does $$40\ \mathrm{J} of $$work on the surroundings?

Accepted Answer

$$\Delta E = +60\ \mathrm{J}$$

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

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