Question 1

Which of the following best defines a strong electrolyte?

Accepted Answer

A substance that dissolves in water to give a solution that conducts electricity very well due to complete dissociation into ions.

Question 2

Which of the following statements about redox reactions is correct?

Accepted Answer

A redox reaction involves the transfer of electrons between reactants.

Question 3

When FeCl$$_2$$ dissolves in water, which ions are present in the solution?

Accepted Answer

$$\mathrm{Fe$$^{2+}$$}$$ and $$2\ \mathrm{Cl^-}$$

Question 4

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

Accepted Answer

PbI$$_2$$

Question 5

What is the net ionic equation for the reaction between Na$$_2CO$_3 (aq) $$and AgNO$$_3 (aq$$)?

Accepted Answer

$$\mathrm{2Ag^+ (aq) + CO_3$^{2-} (aq) \rightarrow Ag_2CO_3 (s)}$$

Question 6

Which of the following solutions is the most acidic?

Accepted Answer

0.2 M HI

Question 7

Which of the following is a weak electrolyte in water?

Accepted Answer

NH$$_3$$

Question 8

What is the oxidation number of Mn in KMnO$$_4$$?

Accepted Answer

+7

Question 9

Which element is oxidized and which is reduced in the reaction: $$\mathrm{N_2$ (g) + 3 H_2$ (g) \rightarrow 2 NH_3$ (g)}$$?

Accepted Answer

N is reduced, H is oxidized

Question 10

A solution is prepared by dissolving 20.00 mL of glacial acetic acid (density = 1.049 g/mL) in enough water to make 250.0 mL of solution. What is the molarity of the acetic acid solution? (Molar mass of acetic acid = 60.05 g/mol)

Accepted Answer

$$0.839\ \mathrm{M}$$

Question 11

How many grams of ethanol (CH$$_3CH$_2OH$$, molar mass = 46.07 g/mol) are needed to prepare 1.00 L of a 6.86 M ethanol solution?

Accepted Answer

$$316\ \mathrm{g}$$

Question 12

Which of the following statements is FALSE? Justify your answer.

Accepted Answer

If a system is oxidized, it is gaining electrons.

Question 13

What is the minimum mass of NaHCO$$_3 ($$molar mass = 84.01 g/mol) required to neutralize 27 mL of 6.0 M H$$_2SO$_4$$? (Reaction: $$2\ \mathrm{$$NaHCO_3$$ (s) + H_2SO_4 (aq) \rightarrow Na_2SO_4 (aq) + 2 H_2O (l) + 2 CO_2$ (g)})$$

Accepted Answer

$$13.6\ \mathrm{g}$$

Question 14

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

Accepted Answer

A reaction in which two compounds exchange ions to form two new compounds.

Question 15

According to the activity series, which metal will displace copper from a solution of copper(II) nitrate?

Accepted Answer

Iron

Question 16

What is the net ionic equation for the reaction between HBr (aq) and Ca(OH)$$_2 (aq$$)?

Accepted Answer

$$2\ \mathrm{H^+ (aq) + 2 OH^- (aq) \rightarrow 2 H_2O (l)}$$

Question 17

A 0.135 M solution of Na$$^+$$ ions is present in 5.0 L of blood. What is the mass of sodium ions in the blood? (Molar mass of Na = 22.99 g/mol)

Accepted Answer

$$15.5\ \mathrm{g}$$

Question 18

Which of the following substances exists in aqueous solution entirely as ions?

Accepted Answer

NaClO$$_4$$

Question 19

Which of the following is a nonelectrolyte in water?

Accepted Answer

CH$$_3CH$_2OH ($$ethanol)

Question 20

What is the molar concentration of ethanol in blood if the BAC is 0.08 g per 100 mL? (Molar mass of ethanol = 46.07 g/mol)

Accepted Answer

$$0.0174\ \mathrm{M}$$

General Chemistry I – Chapter 4 Practice Problems Study Guide

Guida di studio - Domande di pratica

Study guide - Flashcard