Question 1

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

Accepted Answer

A substance that completely dissociates into ions in water, resulting in a strong current.

Question 2

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

Accepted Answer

$$\mathrm{AgCl}$$

Question 3

A solution is prepared by dissolving $$0.50$$ moles of $$\mathrm{NaCl} in $$enough water to make $$1.0 L of $$solution. What is the molarity of the solution?

Accepted Answer

$$0.50\ \mathrm{M}$$

Question 4

Which of the following best explains why $$\mathrm{NaCl}$$ conducts electricity when dissolved in water but $$\mathrm{C_6H_{12}O_6$} ($$glucose) does not?

Accepted Answer

$$\mathrm{NaCl}$$ forms ions in solution, while glucose does not dissociate into ions.

Question 5

What is the net ionic equation for the reaction between aqueous solutions of $$\mathrm{Na_2SO_4}$$ and $$\mathrm{$$BaCl_2$$}$$?

Accepted Answer

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

Question 6

A $$25.0\ \mathrm{mL}$$ sample of $$0.100\ \mathrm{M}$$ $$\mathrm{HCl} is $$titrated with $$0.125\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$20.0\ \mathrm{mL}$$

Question 7

Which of the following statements about acids and bases is correct according to the Brønsted-Lowry definition?

Accepted Answer

An acid is a proton donor and a base is a proton acceptor.

Question 8

Which of the following is a weak electrolyte?

Accepted Answer

$$\mathrm{CH_3COOH} ($$acetic acid)

Question 9

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

Accepted Answer

$$+6$$

Question 10

Which of the following best describes what happens when $$\mathrm{$$AgNO_3$$} is $$added to a solution containing $$\mathrm{NaCl}$$?

Accepted Answer

A precipitate of $$\mathrm{AgCl}$$ forms.

Question 11

A $$0.500\ \mathrm{L}$$ solution contains $$0.250$$ moles of $$\mathrm{KBr}. $$What is the molarity of the solution?

Accepted Answer

$$0.500\ \mathrm{mol} / 0.500\ \mathrm{L} = 0.500\ \mathrm{M}$$

Question 12

Which of the following is the correct net ionic equation for the reaction of hydrochloric acid with sodium hydroxide?

Accepted Answer

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

Question 13

Which of the following best describes the role of a reducing agent in a redox reaction?

Accepted Answer

It loses electrons and is oxidized.

Question 14

A $$50.0\ \mathrm{mL}$$ sample of $$0.200\ \mathrm{M}$$ $$\mathrm{K_2SO_4} is $$mixed with $$50.0\ \mathrm{mL} of$$ $$0.200\ \mathrm{M}$$ $$\mathrm{Ba(NO_3$)_2}. $$What mass of $$\mathrm{$$BaSO_4$$}$$ precipitate will form? (Molar mass $$\mathrm{$$BaSO_4$$} = 233\ \mathrm{g/mol})$$

Accepted Answer

$$1.17\ \mathrm{g}$$

Question 15

Which of the following is a correct statement about the dissolution of ionic compounds in water?

Accepted Answer

The compound dissociates into ions, which are stabilized by interactions with water molecules.

Question 16

Which of the following solutions will have the highest concentration of ions?

Accepted Answer

$$0.10\ \mathrm{M}$$ $$\mathrm{Na_2SO_4}$$

Question 17

Which of the following is the correct balanced molecular equation for the reaction of potassium carbonate with hydrochloric acid?

Accepted Answer

$$\mathrm{K_2CO_3 (aq) + 2HCl (aq) \rightarrow 2KCl (aq) + H_2O (l) + CO_2$ (g)}$$

Question 18

A $$10.0\ \mathrm{mL}$$ sample of $$0.100\ \mathrm{M}$$ $$\mathrm{HCl} is $$titrated with $$0.200\ \mathrm{M}$$ $$\mathrm{NaOH}. $$What volume of $$\mathrm{NaOH} is $$required to reach the equivalence point?

Accepted Answer

$$5.00\ \mathrm{mL}$$

Question 19

Which of the following best describes what happens when $$\mathrm{NH_4Cl} is $$dissolved in water?

Accepted Answer

It dissociates into $$\mathrm{NH_4$^+}$$ and $$\mathrm{Cl^-}$$ ions.

Chapter 4 Student Notes

Guida di studio - Domande di pratica

Study guide - Flashcard