Question 1

Which of the following statements best explains why NaCl conducts electricity when dissolved in water, but C2H5OH does not?

Accepted Answer

NaCl dissociates into ions in water, while C2H5OH dissolves as neutral molecules.

Question 2

A student prepares a solution by dissolving 0.50 mol of KNO3 in enough water to make 1.0 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 3

Which of the following is a strong electrolyte in aqueous solution?

Accepted Answer

$$\mathrm{NaCl}$$

Question 4

A laboratory technician needs to prepare 250 mL of 0.10 M NaCl solution from a 1.0 M NaCl stock solution. What volume of the stock solution should be used?

Accepted Answer

$$25\ \mathrm{mL}$$

Question 5

Which of the following reactions is a precipitation reaction?

Accepted Answer

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

Question 6

What is the net ionic equation for the reaction between HNO3(aq) and NaOH(aq)?

Accepted Answer

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

Question 7

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

Accepted Answer

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

Question 8

A solution is prepared by dissolving 5.00 g of NaCl (molar mass = 58.44 g/mol) in enough water to make 250 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.342\ \mathrm{M}$$

Question 9

Which of the following statements about oxidation numbers is correct?

Accepted Answer

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

Question 10

In the reaction $$4Fe(s) + 3O_2(g) \rightarrow 2Fe_2O_3(s)$$, what is the change in oxidation number for iron?

Accepted Answer

From 0 to +3

Question 11

Which of the following is a weak acid?

Accepted Answer

$$\mathrm{HC_2H_3O_2} ($$acetic acid)

Question 12

A 100 mL sample of 0.50 M HCl is mixed with 100 mL of 0.50 M NaOH. What is the concentration of HCl remaining after the reaction is complete?

Accepted Answer

$$0\ \mathrm{M}$$

Question 13

Which of the following best describes the process of reduction in a redox reaction?

Accepted Answer

A gain of electrons by an atom, causing its oxidation number to decrease.

Question 14

Which of the following solutions will have the highest electrical conductivity?

Accepted Answer

$$0.10\ \mathrm{M}\ \mathrm{NaCl}$$

Question 15

A student adds 50.0 mL of 2.0 M NaOH to 150.0 mL of water. What is the final concentration of NaOH in the resulting solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 16

Which of the following is the correct net ionic equation for the reaction between AgNO3(aq) and NaCl(aq)?

Accepted Answer

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

Question 17

Which of the following best describes a neutralization reaction?

Accepted Answer

A reaction in which an acid and a base react to form water and a salt.

Question 18

In the reaction $$H_2SO_4(aq) + Li_2S(aq) \rightarrow Li_2SO_4(aq) + H_2S(g)$$, what drives the reaction to completion?

Accepted Answer

Formation of a gas that leaves the solution.

Question 19

Which of the following statements about making a solution of known concentration is correct?

Accepted Answer

The solute is weighed, added to a volumetric flask, and water is added to the mark.

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

Guida di studio - Domande di pratica

Study guide - Flashcard