Q: Which of the following is the correct formula for calculating molarity?

$ \text{Molarity} = \frac{\text{moles of solute}}{\text{volume of solution (L)}} $

Question 1

Which of the following best describes a solution?

Accepted Answer

A homogeneous mixture of two or more pure substances.

Question 2

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

Accepted Answer

NaCl

Question 3

What is the net ionic equation for the reaction between aqueous solutions of Pb(NO_3)_2 and KI?

Accepted Answer

$ \mathrm{Pb}^{2+}(aq) + 2\mathrm{I}^-(aq) \rightarrow \mathrm{PbI}_2(s) $

Question 4

Which of the following is NOT a property of a strong electrolyte?

Accepted Answer

It forms a chemical equilibrium with water.

Question 5

A student mixes solutions of Na_2SO_4 and BaCl_2. What is the precipitate formed, if any?

Accepted Answer

BaSO_4

Question 6

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

Accepted Answer

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

Question 7

Which of the following is a correct statement about oxidation numbers?

Accepted Answer

The sum of the oxidation numbers in a neutral compound is zero.

Question 8

What is the oxidation number of sulfur in $ \mathrm{SO_4^{2-}} $?

Accepted Answer

+6

Question 9

Which of the following best describes a metathesis (exchange) reaction?

Accepted Answer

A reaction in which the cations and anions of two compounds exchange partners.

Question 10

A 0.1 mol sample of each of the following is dissolved in 1 L of water: Ca(NO_3)_2, glucose (C_6H_{12}O_6), NaCH_3COO, and CH_3COOH. Which solution will have the highest electrical conductivity?

Accepted Answer

Ca(NO_3)_2

Question 11

Which of the following is a correct net ionic equation for the neutralization of HCl with NaOH?

Accepted Answer

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

Question 12

Which of the following reactions will produce a gas as one of the products?

Accepted Answer

$ \mathrm{CaCO_3}(s) + 2\mathrm{HCl}(aq) \rightarrow \mathrm{CaCl_2}(aq) + \mathrm{CO_2}(g) + \mathrm{H_2O}(l) $

Question 13

Which of the following is the correct formula for calculating molarity?

Accepted Answer

$ 	ext{Molarity} = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}} $

Question 14

A solution is prepared by dissolving 23.4 g of Na_2SO_4 in enough water to make 125 mL of solution. What is the molarity of the solution? (Molar mass of Na_2SO_4 = 142.04 g/mol)

Accepted Answer

0.165 M

Question 15

How many moles of K^+ ions are present in 0.015 M K_2CO_3 solution?

Accepted Answer

0.030 mol/L

Question 16

Which of the following statements about dilution is correct?

Accepted Answer

The number of moles of solute remains constant.

Question 17

If you dilute 50.0 mL of a 2.0 M NaCl solution to a final volume of 200.0 mL, what is the new concentration?

Accepted Answer

0.50 M

Question 18

During a titration, 25.0 mL of 0.100 M HCl is required to neutralize 50.0 mL of NaOH solution. What is the concentration of the NaOH solution?

Accepted Answer

0.0500 M

Question 19

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are transferred between species.

Chapter 4: Reactions in Aqueous Solution – General Chemistry Study Notes

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