Question 1

Which chemical reaction is primarily responsible for the formation of cenotes (sinkholes) in limestone regions such as the Yucatan Peninsula?

Accepted Answer

$$\mathrm{$$CaCO_3$$(s) + H_2O(l) + CO_2$(aq) \rightarrow Ca($$HCO_3$$)_2(aq)}$$

Question 2

A solution is prepared by dissolving 5.00 g of glucose ($$\mathrm{C_6H_{12}O_6$}$$, molar mass = 180.18 g/mol) in enough water to make 100.0 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.0278\ \mathrm{M}$$

Question 3

Which of the following best describes the role of phosphates in preventing the Flint Water Crisis?

Accepted Answer

Phosphates form a protective layer inside pipes, preventing lead from leaching into the water.

Question 4

How many grams of sodium chloride ($$\mathrm{NaCl}$$, molar mass = 58.44 g/mol) are dissolved in 50.0 mL of a 2.0 M solution?

Accepted Answer

$$5.8\ \mathrm{g}$$

Question 5

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

Accepted Answer

$$\mathrm{ZnS}$$

Question 6

Which of the following is a strong electrolyte when dissolved in water?

Accepted Answer

Sodium chloride ($$\mathrm{NaCl})$$

Question 7

A stock solution of $$\mathrm{$$HNO_3$$} is 12.7 M. If 25.0 mL of $$this stock is diluted to a final volume of 0.500 L, what is the concentration of the diluted solution?

Accepted Answer

$$0.635\ \mathrm{M}$$

Question 8

Which of the following best describes a nonelectrolyte solution?

Accepted Answer

A solution that does not conduct electricity because the solute does not dissociate into ions.

Question 9

What is the net ionic equation for the reaction between aqueous solutions of silver nitrate and potassium chloride?

Accepted Answer

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

Question 10

Which of the following statements about redox reactions is correct?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 11

A 13.8 mL aliquot of 0.176 M $$\mathrm{H_3PO_4} is $$titrated with 0.110 M NaOH. What volume (mL) of base is required to reach the equivalence point? ($$\mathrm{H_3PO_4 + 3NaOH \rightarrow Na_3PO_4 + 3H_2O})$$

Accepted Answer

$$22.1$$

Question 12

Which of the following best explains why the water in Flint, Michigan, became contaminated with lead after switching to the Flint River as a water source?

Accepted Answer

The Flint River water was more corrosive and lacked corrosion-control chemicals, causing lead to leach from pipes.

Question 13

Which of the following is the correct oxidation number for sulfur in $$\mathrm{SO_4$^{2-}}$$?

Accepted Answer

$$+6$$

Question 14

Which of the following pairs will form a precipitate when their aqueous solutions are mixed?

Accepted Answer

$$\mathrm{$$NiBr_2$$}$$ and $$\mathrm{$$AgNO_3$$}$$

Question 15

What is the molarity of a potassium hydroxide solution if 42.5 mL of KOH completely reacts with 25.0 mL of 0.100 M $$\mathrm{H_3PO_4}$$? ($$\mathrm{H_3PO_4 + 3KOH \rightarrow K_3PO_4 + 3H_2O})$$

Accepted Answer

$$0.0588\ \mathrm{M}$$

Question 16

Which of the following best describes a strong acid in aqueous solution?

Accepted Answer

It completely ionizes to produce $$\mathrm{H^+}$$ ions.

Question 17

Which of the following is the correct net ionic equation for the reaction between acetic acid ($$\mathrm{HC_2H_3O_2}) $$and potassium hydroxide ($$\mathrm{KOH}) in $$aqueous solution?

Accepted Answer

$$\mathrm{HC_2H_3O_2(aq) + OH^-(aq) \rightarrow C_2H_3O_2^-(aq) + H_2O(l)}$$

Question 18

Which of the following best describes the process of dilution in solution preparation?

Accepted Answer

Adding solvent to a concentrated solution to decrease its molarity while keeping the amount of solute constant.

Chapter 5: Introduction to Solutions and Aqueous Reactions – Study Notes

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