Question 1

A chemist reacts 12.0 g of NaCl with excess AgNO$$_3 to $$produce AgCl according to the equation:

$$\mathrm{NaCl(aq) + $$AgNO_3$$(aq) \rightarrow AgCl(s) + $$NaNO_3$$(aq)}$$

What is the theoretical yield of AgCl (in grams)? (Molar masses: NaCl = 58.44 g/mol, AgCl = 143.32 g/mol)

Accepted Answer

29.4 g

Question 2

Which of the following statements about strong electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate into ions in aqueous solution.

Question 3

A solution is prepared by dissolving 5.00 g of KNO$$_3 ($$molar mass = 101.1 g/mol) in enough water to make 250.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.198\ \mathrm{M}$$

Question 4

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

Accepted Answer

BaSO$$_4$$

Question 5

What is the net ionic equation for the reaction between aqueous solutions of Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

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

Question 6

Which of the following is a strong acid?

Accepted Answer

HNO$$_3$$

Question 7

A 25.0 mL sample of 0.200 M HCl is titrated with 0.100 M NaOH. What volume of NaOH (in mL) is required to reach the equivalence point?

Accepted Answer

50.0 mL

Question 8

Which gas law describes the relationship between the volume and temperature of a gas at constant pressure?

Accepted Answer

Charles's Law

Question 9

A sample of gas has a volume of 2.50 L at 1.00 atm and 25$$^\circC. $$What will the volume be at 2.00 atm and 25$$^\circC$$?

Accepted Answer

1.25 L

Question 10

Which of the following is the correct formula for calculating the density of a gas at STP?

Accepted Answer

$$\mathrm{Density = \frac{molar\ mass}{22.4\ L}}$$

Question 11

Which of the following is oxidized in the reaction:

$$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}$$?

Accepted Answer

Na

Question 12

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

Accepted Answer

0.5 atm

Question 13

Which of the following is the correct net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 14

A 10.0 L container holds 0.500 mol of O$$_2$$ gas at 27$$^\circC. $$What is the pressure in the container? ($$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

1.22 atm

Question 15

Which of the following is a weak electrolyte?

Accepted Answer

CH$$_3$$COOH

Question 16

Which of the following is the correct oxidation number for sulfur in SO$$_4$$^{2-}$$?

Accepted Answer

+6

Question 17

A 100.0 mL sample of 0.500 M Na$$_2SO$_4 is $$diluted to 250.0 mL. What is the new concentration?

Accepted Answer

0.200 M

Question 18

Which of the following gases will have the highest density at STP?

Accepted Answer

CO$$_2$$

Question 19

Which of the following is the correct molecular formula for the acetate ion?

Accepted Answer

C$$_2H$_3O$_2^-$$

Question 20

Which of the following reactions is a combustion reaction?

Accepted Answer

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

CHM1045 Exam 2 Study Guide: Chemical Reactions, Solutions, and Gases

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