Question 1

A student dissolves 5.00 g of NaCl (molar mass = $$58.44 \ \mathrm{g/mol}) in $$enough water to make 250.0 mL of solution. What is the molarity of the resulting NaCl solution?

Accepted Answer

$$0.342 \ \mathrm{M}$$

Question 2

Which of the following compounds is expected to be insoluble in water?

Accepted Answer

BaSO$$_4$$

Question 3

A reaction has a theoretical yield of $$12.0 \ \mathrm{g}$$, but only $$9.0 \ \mathrm{g} of $$product is actually obtained. What is the percent yield?

Accepted Answer

$$75\%$$

Question 4

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

Accepted Answer

Gas particles are attracted to each other.

Question 5

Which of the following pairs of solutions will produce a precipitate when mixed?

Accepted Answer

AgNO$$_3 (aq) + $$NaCl (aq)

Question 6

A 2.00 L container holds $$0.500 \ \mathrm{mol} of O$_2$$ gas at $$27.0^\circ \mathrm{C}. $$What is the pressure of the gas? ($$R = 0.08206 \ \mathrm{L \cdot atm \cdot $$mol^{-1}$$ \cdot K$$^{-1}$$})$$

Accepted Answer

$$6.12 \ \mathrm{atm}$$

Question 7

Which of the following is the correct net ionic equation for the reaction between aqueous solutions of Na$$_2CO$_3$$ and CaCl$$_2$$?

Accepted Answer

$$\mathrm{Ca}^{2+} (aq) + \mathrm{CO}_3$$^{2-}$$ (aq) \rightarrow \mathrm{CaCO}_3 (s)$$

Question 8

A sample of gas occupies $$4.00 \ \mathrm{L} at$$ $$300 \ \mathrm{K}. To $$what temperature must it be heated to occupy $$6.00 \ \mathrm{L} at $$constant pressure?

Accepted Answer

$$450 \ \mathrm{K}$$

Question 9

Which of the following elements reacts most vigorously with water?

Accepted Answer

K

Question 10

What is the oxidation state of nitrogen in NO$$_3^-$$?

Accepted Answer

$$+5$$

Question 11

Which of the following is a strong electrolyte?

Accepted Answer

NaCl (aq)

Question 12

A mixture of gases contains $$2.0 \ \mathrm{mol} of N$_2$$, $$1.0 \ \mathrm{mol} of O$_2$$, and $$1.0 \ \mathrm{mol} of CO$_2. If $$the total pressure is $$4.0 \ \mathrm{atm}$$, what is the partial pressure of O$$_2$$?

Accepted Answer

$$1.0 \ \mathrm{atm}$$

Question 13

Which of the following statements about solubility rules is correct?

Accepted Answer

All nitrates are soluble in water.

Question 14

What is the molar mass of Ca(OH)$$_2$$?

Accepted Answer

$$74.10 \ \mathrm{g/mol}$$

Question 15

Which of the following is a redox reaction?

Accepted Answer

$$2 \mathrm{Na} (s) + 2 \mathrm{H}_2\mathrm{O} (l) \rightarrow 2 \mathrm{NaOH} (aq) + \mathrm{H}_2 (g)$$

Question 16

A $$10.0 \ \mathrm{g}$$ sample of Mg reacts with excess HCl to produce MgCl$$_2$$ and H$$_2$$ gas. How many moles of H$$_2$$ are produced? (Molar mass of Mg = $$24.3 \ \mathrm{g/mol})$$

Accepted Answer

$$0.411 \ \mathrm{mol}$$

Question 17

Which of the following best explains why the pressure of a gas increases when its temperature increases at constant volume?

Accepted Answer

The gas particles move faster and collide with the walls more frequently and with greater force.

Question 18

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

Accepted Answer

$$2 \mathrm{Al} (s) + 6 \mathrm{HCl} (aq) \rightarrow 2 \mathrm{AlCl}_3 (aq) + 3 \mathrm{H}_2 (g)$$

Question 19

A $$1.00 \ \mathrm{L}$$ sample of a gas at $$300 \ \mathrm{K}$$ and $$1.00 \ \mathrm{atm} is $$compressed to $$0.500 \ \mathrm{L} at $$constant temperature. What is the new pressure?

Accepted Answer

$$2.00 \ \mathrm{atm}$$

General Chemistry Study Guide: Chemical Reactions, Solutions, and Gases

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