Question 1

A reaction between 10.0 g of aluminum ($$\mathrm{Al}) $$and 35.0 g of chlorine gas ($$\mathrm{Cl_2$}) $$produces aluminum chloride ($$\mathrm{$$AlCl_3$$}) $$according to the equation:

$$2\mathrm{Al} + 3\mathrm{Cl_2$} \rightarrow 2\mathrm{$$AlCl_3$$}$$

Which reactant is the limiting reactant?

Accepted Answer

Chlorine gas ($$\mathrm{Cl_2$})$$

Question 2

A student mixes solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{Ba(NO_3$)_2}. A $$white precipitate forms. Which equation represents the correct net ionic equation for this reaction?

Accepted Answer

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

Question 3

Which of the following is a strong acid?

Accepted Answer

$$\mathrm{$$HNO_3$$}$$

Question 4

A 0.250 L solution contains 0.050 mol of $$\mathrm{NaCl}. $$What is the molarity of the solution?

Accepted Answer

$$0.20\ \mathrm{M}$$

Question 5

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

Accepted Answer

$$+6$$

Question 6

Which of the following is the oxidizing agent in the reaction below?

$$\mathrm{Zn (s) + Cu$$^{2+}$$ (aq) \rightarrow Zn$$^{2+}$$ (aq) + Cu (s)}$$

Accepted Answer

$$\mathrm{Cu$$^{2+}$$}$$

Question 7

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{2H_2 (g) + O_2$ (g) \rightarrow 2H_2O (l)}$$

Question 8

A sample of gas occupies 2.00 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K?

Accepted Answer

$$1.00\ \mathrm{L}$$

Question 9

A 5.00 L container holds $$2.00$$ mol of $$\mathrm{O_2$}$$ gas at $$300\ \mathrm{K}. $$What is the pressure inside the container? ($$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$9.84\ \mathrm{atm}$$

Question 10

Which of the following pairs will form a precipitate when mixed in aqueous solution?

Accepted Answer

$$\mathrm{$$AgNO_3$$}$$ + $$\mathrm{NaCl}$$

Question 11

A mixture of $$\mathrm{N_2$}$$, $$\mathrm{O_2$}$$, and $$\mathrm{CO_2$}$$ gases has partial pressures of $$0.50\ \mathrm{atm}$$, $$0.30\ \mathrm{atm}$$, and $$0.20\ \mathrm{atm}$$, respectively. What is the mole fraction of $$\mathrm{O_2$}$$?

Accepted Answer

$$0.30$$

Question 12

Which of the following is a spectator ion in the reaction:

$$\mathrm{Na_2SO_4 (aq) + $$BaCl_2$$ (aq) \rightarrow 2NaCl (aq) + $$BaSO_4$$ (s)}$$

Accepted Answer

$$\mathrm{Na^+}$$

Question 13

Calculate the root-mean-square velocity ($$u_{rms}) of$$ $$\mathrm{N_2$}$$ molecules at $$300\ \mathrm{K}$$. ($$M = 28.0\ \mathrm{g/mol}$$, $$R = 8.314\ \mathrm{J\cdot $$mol^{-1}$$\cdot K$$^{-1}$$}$$)

$$u_{rms} = \sqrt{\frac{3RT}{M}} ($$Use $$M in kg/$$mol)

Accepted Answer

$$517\ \mathrm{m/s}$$

Question 14

Which of the following is a weak base?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 15

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

Accepted Answer

$$75\%$$

Question 16

Which of the following is an acid-base reaction?

Accepted Answer

$$\mathrm{HCl (aq) + NaOH (aq) \rightarrow NaCl (aq) + H_2O (l)}$$

Question 17

A sample of $$\mathrm{H_2$}$$ gas effuses four times faster than a sample of another gas. What is the molar mass of the unknown gas?

(Graham's law: $$\frac{	ext{rate}_1}{	ext{rate}_2} = \sqrt{\frac{M_2$}{M_1$}})$$

Accepted Answer

$$16\ \mathrm{g/mol}$$

Question 18

Which of the following is the correct balanced equation for the combustion of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

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

Question 19

A solution is prepared by dissolving $$0.10$$ mol $$\mathrm{$$CaCl_2$$} in $$enough water to make $$1.0 L of $$solution. What is the molarity of chloride ions ($$\mathrm{Cl^-}) in $$the solution?

Accepted Answer

$$0.20\ \mathrm{M}$$

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