Question 1

Which of the following correctly represents the balanced chemical equation for the combustion of methane ($$\mathrm{CH_4$}) in $$oxygen?

Accepted Answer

$$\mathrm{CH_4$ + 2O_2 \rightarrow CO_2$ + 2H_2O}$$

Question 2

A student reacts 12.0 g of sodium ($$\mathrm{Na}) $$with excess chlorine gas ($$\mathrm{Cl_2$}) to $$produce sodium chloride ($$\mathrm{NaCl}). $$What mass of $$\mathrm{NaCl} is $$produced? (Molar masses: $$\mathrm{Na} = 23.0\ \mathrm{g/mol}$$, $$\mathrm{Cl} = 35.5\ \mathrm{g/mol})$$

Accepted Answer

30.7 g

Question 3

Which of the following statements about electrolytes is TRUE?

Accepted Answer

Electrolytes dissociate into ions in water and conduct electricity.

Question 4

A solution is prepared by dissolving 0.50 mol of $$\mathrm{NaCl} in $$enough water to make 1.0 L of solution. What is the molarity ($$M) of $$the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 5

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid forms from two aqueous solutions.

Question 6

What is the net ionic equation for the reaction between aqueous $$\mathrm{$$AgNO_3$$}$$ and $$\mathrm{NaCl}$$?

Accepted Answer

$$\mathrm{Ag^+ + Cl^- \rightarrow AgCl(s)}$$

Question 7

Which statement best explains why acid-base reactions are called neutralization reactions?

Accepted Answer

Because the acid and base react to form a salt and water, neutralizing each other's properties.

Question 8

What is the oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

+6

Question 9

A 2.0 M solution of $$\mathrm{HCl} is $$diluted to make 0.5 L of a 0.5 M solution. What volume of the original solution is required? (Use $$M_1V_1 = M_2V_2)$$

Accepted Answer

0.125 L

Question 10

According to Boyle's Law, what happens to the volume of a gas if the pressure is doubled while temperature remains constant?

Accepted Answer

The volume is halved.

Question 11

A sample of gas occupies 3.0 L at 300 K. If the temperature is increased to 600 K at constant pressure, what will be the new volume? (Use Charles's Law: $$\frac{V_1$}{T_1$} = \frac{V_2$}{T_2$})$$

Accepted Answer

6.0 L

Question 12

Which equation represents the Ideal Gas Law?

Accepted Answer

$$PV = nRT$$

Question 13

Which of the following statements about molecular speed is correct?

Accepted Answer

Molecules with lower molar mass move faster at the same temperature.

Question 14

Which of the following best defines effusion?

Accepted Answer

The escape of gas molecules through a tiny hole into a vacuum.

Question 15

A mixture contains 2 mol of $$\mathrm{O_2$}$$ and 3 mol of $$\mathrm{N_2$}. $$What is the mole fraction of $$\mathrm{O_2$}$$?

Accepted Answer

$$\frac{2}{5}$$

Question 16

Which of the following is a correct complete ionic equation for the reaction between $$\mathrm{K_2SO_4}$$ and $$\mathrm{Ba(NO_3$)_2} in $$water?

Accepted Answer

$$\mathrm{2K^+ + SO_4$^{2-} + Ba$$^{2+}$$ + 2NO_3^- \rightarrow $$BaSO_4$$(s) + 2K^+ + 2NO_3^-}$$

Question 17

A real-life scenario: In a hospital, oxygen gas is stored in a tank at 20.0 atm and 300 K. If the tank has a volume of 10.0 L, how many moles of oxygen are present? (Use $$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

8.1 mol

Question 18

Which of the following is NOT a characteristic of a neutralization reaction?

Accepted Answer

It always produces a gas.

Question 19

A student mixes 100 mL of 0.1 M $$\mathrm{Na_2SO_4}$$ with 100 mL of 0.1 M $$\mathrm{$$BaCl_2$$}. $$What is the concentration of $$\mathrm{$$BaSO_4$$}$$ formed, assuming complete precipitation?

Accepted Answer

0.05 M

Exam II Review: Chemical Reactions, Solutions, and Gases

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