Question 1

Which of the following compounds is insoluble in water according to the solubility guidelines provided?

Accepted Answer

$$\mathrm{$$PbSO_4$$}$$

Question 2

What is the net ionic equation for the reaction between aqueous solutions of calcium chloride and sodium carbonate?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$ (aq) + CO_3$^{2-} (aq) \rightarrow $$CaCO_3$$ (s)}$$

Question 3

Calculate the molarity of a solution prepared by dissolving 23.4 g of sodium sulfate ($$\mathrm{Na_2SO_4}$$, molar mass = 142.0 g/mol) in enough water to make 125 mL of solution.

Accepted Answer

$$1.32\ \mathrm{M}$$

Question 4

Which of the following statements about oxidation numbers is correct?

Accepted Answer

The oxidation number of hydrogen in compounds with nonmetals is $$+1.$$

Question 5

How many grams of $$\mathrm{$$CaCl_2$$} ($$molar mass = 110.98 g/mol) are required to make 0.425 L of a 0.300 M $$\mathrm{$$CaCl_2$$}$$ solution?

Accepted Answer

$$14.1\ \mathrm{g}$$

Question 6

A fuel is burned in a cylinder equipped with a piston. The initial volume is 0.250 L, and the final volume is 0.980 L. If the piston expands against a constant pressure of 1.35 atm, how much work (in J) is done by the system? ($$1\ \mathrm{L \cdot atm} = 101.3\ \mathrm{J})$$

Accepted Answer

$$99.5\ \mathrm{J}$$

Question 7

How much heat is required to raise the temperature of 250 g of water from $$22.0\ ^\circ\mathrm{C} to$$ $$98.0\ ^\circ\mathrm{C}$$? (Specific heat of water $$= 4.18\ \mathrm{J/g\cdot K})$$

Accepted Answer

$$79,100\ \mathrm{J}$$

Question 8

Which of the following best describes the process occurring when methane gas is burned in a constant-pressure system?

Accepted Answer

The system releases heat to the surroundings.

Question 9

What is the density (in $$\mathrm{g/L}) of $$carbon tetrachloride vapor at 714 torr and $$398\ \mathrm{K}$$? (Molar mass $$= 153.8\ \mathrm{g/mol}$$, $$R = 0.0821\ \mathrm{L\cdot atm/(mol\cdot K)})$$

Accepted Answer

$$0.352\ \mathrm{g/L}$$

Question 10

A flask is filled with an unknown gas to a pressure of 735 torr at $$23.0\ ^\circ\mathrm{C}. $$The mass of the gas is found to be 2.761 g and the volume of the flask is 0.950 L. What is the molar mass of the gas? ($$R = 0.0821\ \mathrm{L\cdot atm/(mol\cdot K)})$$

Accepted Answer

$$71.0\ \mathrm{g/mol}$$

Question 11

Which of the following compounds will form a precipitate when mixed with a solution of $$\mathrm{$$AgNO_3$$}$$?

Accepted Answer

$$\mathrm{NaCl}$$

Question 12

Which of the following is the correct balanced molecular equation for the reaction of aluminum with hydrobromic acid?

Accepted Answer

$$2\mathrm{Al} (s) + 6\mathrm{HBr} (aq) \rightarrow 2\mathrm{$$AlBr_3$$} (aq) + 3\mathrm{H_2$} (g)$$

Question 13

Which of the following ions is always soluble in water, regardless of the counterion?

Accepted Answer

$$\mathrm{NO_3$^-}$$

Question 14

A student mixes solutions of $$\mathrm{Ba(NO_3$)_2}$$ and $$\mathrm{Na_2SO_4}. $$What is the identity of the precipitate formed?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 15

Which of the following best describes the energy change when a chemical reaction releases heat to the surroundings at constant pressure?

Accepted Answer

$$\Delta H \u003c 0$$

General Chemistry Study Guide: Reactions in Aqueous Solutions, Thermochemistry, and Gases

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