Q: A student mixes solutions of AgNO$$_3$$ and Na$$_2$$CrO$$_4$$ and observes a red precipitate. Which of the following is the correct net ionic equation for this reaction?

$$2\text{Ag}^+(aq) + \text{CrO}_4$$^{2-}$$(aq) \rightarrow \text{Ag}_2\text{CrO}_4(s)$$

Q: Which of the following is the correct balanced net ionic equation for the reaction between HCl(aq) and NaOH(aq)?

$$\text{H}^+(aq) + \text{OH}^-(aq) \rightarrow \text{H}_2\text{O}(l)$$

Q: Which of the following is the correct total ionic equation for the reaction between Sr(OH)$$_2(aq) $$and HClO$$_4(aq$$)?

$$\text{Sr}^{2+}(aq) + 2\text{OH}^-(aq) + 2\text{H}^+(aq) + 2\text{ClO}_4^-(aq) \rightarrow 2\text{H}_2\text{O}(l) + \text{Sr}^{2+}(aq) + 2\text{ClO}_4^-(aq)$$

Question 1

Which of the following best explains why water (H$$_2O) is an $$effective solvent for ionic compounds such as NaCl?

Accepted Answer

Water molecules have a bent shape and are polar, allowing them to surround and stabilize both cations and anions.

Question 2

Refer to the image showing the dissolution of NaCl in water. What is the primary interaction responsible for the dissolution process?

Accepted Answer

Ion-dipole interactions between water molecules and the Na$$^+$$ and Cl$$^-$$ ions.

Question 3

A student mixes solutions of AgNO$$_3$$ and Na$$_2$$CrO$$_4$$ and observes a red precipitate. Which of the following is the correct net ionic equation for this reaction?

Accepted Answer

$$2	ext{Ag}^+(aq) + 	ext{CrO}_4$$^{2-}$$(aq) ightarrow 	ext{Ag}_2	ext{CrO}_4(s)$$

Question 4

Which of the following statements about strong and weak electrolytes is correct, as demonstrated by the light bulb conductivity experiment?

Accepted Answer

A strong electrolyte completely dissociates into ions in solution, resulting in high conductivity.

Question 5

Which of the following acids is classified as a strong acid?

Accepted Answer

Nitric acid (HNO$$_3)$$

Question 6

A solution contains 0.50 mol of Ba(OH)$$_2$$ dissolved in water. How many moles of OH$$^-$$ ions are present in the solution?

Accepted Answer

1.0 mol

Question 7

Which of the following best describes the trend in acid strength for the hydrides of Group 17 elements (HF, HCl, HBr, HI)?

Accepted Answer

Acid strength increases as the size of the central atom increases.

Question 8

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

Accepted Answer

$$	ext{H}^+(aq) + 	ext{OH}^-(aq) ightarrow 	ext{H}_2	ext{O}(l)$$

Question 9

In a titration, 25.00 mL of H$$_2SO$_4 is $$neutralized by 30.00 mL of 0.200 M NaOH. What is the concentration of the H$$_2SO$_4$$ solution?

Accepted Answer

$$0.120\ 	ext{M}$$

Question 10

Which of the following statements about oxidation-reduction (redox) reactions is correct?

Accepted Answer

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

Question 11

Assign the oxidation number to sulfur in SO$$_3.$$

Accepted Answer

$$+6$$

Question 12

Which of the following metals can displace hydrogen from water according to the activity series?

Accepted Answer

Potassium (K)

Question 13

In the reaction $$2	ext{Al}(s) + 3	ext{Pb(NO}_3)_2(aq) ightarrow 2	ext{Al(NO}_3)_3(aq) + 3	ext{Pb}(s)$$, which species is the oxidizing agent?

Accepted Answer

Pb(NO$$_3$$)$$_2(aq)$$

Question 14

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which an insoluble solid forms when two solutions are mixed.

Question 15

Which of the following is the correct total ionic equation for the reaction between Sr(OH)$$_2(aq) $$and HClO$$_4(aq$$)?

Accepted Answer

$$	ext{Sr}^{2+}(aq) + 2	ext{OH}^-(aq) + 2	ext{H}^+(aq) + 2	ext{ClO}_4^-(aq) ightarrow 2	ext{H}_2	ext{O}(l) + 	ext{Sr}^{2+}(aq) + 2	ext{ClO}_4^-(aq)$$

Question 16

Which of the following best describes the role of water in acid-base reactions?

Accepted Answer

Water can act as both an acid and a base, facilitating the transfer of protons.

Question 17

Which of the following is true about the equilibrium state in a chemical reaction?

Accepted Answer

The concentrations of reactants and products remain constant because the forward and reverse reactions occur at the same rate.

Question 18

Which of the following best explains why HF is a weak acid while HCl is a strong acid?

Accepted Answer

The H–F bond is much stronger and less easily broken than the H–Cl bond.

Chapter 4: The Major Classes of Chemical Reactions – Study Notes

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