Q: Which of the following is the correct formula for the equilibrium constant of water at 25°C?

$$K_w = [H_3O^+][OH^-] = 1.0 \times 10$$^{-14}$$

Question 1

Which of the following statements best describes an electrolyte in aqueous solution?

Accepted Answer

An electrolyte is a substance that, when dissolved in water, forms a solution that conducts electricity due to the presence of ions.

Question 2

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

Accepted Answer

NaCl (aq)

Question 3

Given the reaction: $$\mathrm{Pb(NO_3$)_2 (aq) + 2NaI (aq) \rightarrow $$PbI_2$$ (s) + 2NaNO_3 (aq)}$$, what type of reaction is this?

Accepted Answer

Precipitation reaction

Question 4

Which of the following is NOT a general property of solutions?

Accepted Answer

A solution is always a mixture of two gases.

Question 5

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

Accepted Answer

AgCl

Question 6

What is the net ionic equation for the reaction between BaCl\_2 (aq) and Na\_2SO\_4 (aq)?

Accepted Answer

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

Question 7

Which of the following best describes a Brønsted-Lowry acid?

Accepted Answer

A substance that donates protons (H\^+ ions).

Question 8

What is the oxidation state of sulfur in SO\_4\^{2-}?

Accepted Answer

+6

Question 9

A solution is prepared by dissolving 1.77 g of ethanol (C\_2H\_5OH) in 8.52 mL of water. What is the molarity of ethanol in the solution? (Molar mass of ethanol = 46.08 g/mol)

Accepted Answer

$$0.452\ \mathrm{M}$$

Question 10

Which equation correctly represents the dilution of a solution?

Accepted Answer

$$C_1$$ $$V_1$$ = $$C_2$$ $$V_2$$

Question 11

In a titration, 27.2 mL of acetic acid solution is neutralized by 50.0 mL of NaOH 0.133 M. What is the concentration of the acetic acid solution?

Accepted Answer

$$0.133\ \mathrm{mol/L}$$

Question 12

Which of the following is a redox reaction?

Accepted Answer

$$\mathrm{Zn (s) + 2H^+ (aq) \rightarrow Zn$$^{2+}$$ (aq) + H_2$ (g)}$$

Question 13

Which of the following is the correct net ionic equation for the neutralization of HCl (aq) with NaOH (aq)?

Accepted Answer

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

Question 14

Which of the following is a weak Brønsted base?

Accepted Answer

NH\_3 (aq)

Question 15

Which of the following ions is a spectator ion in the reaction: $$\mathrm{$$BaCl_2$$ (aq) + Na_2SO_4 (aq) \rightarrow $$BaSO_4$$ (s) + 2NaCl (aq)}$$?

Accepted Answer

Na\^+

Question 16

What is the oxidation state of chlorine in HClO\_4?

Accepted Answer

+7

Question 17

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid product forms from two aqueous solutions.

Question 18

Which of the following is the correct formula for the equilibrium constant of water at 25°C?

Accepted Answer

$$K_w = [H_3O^+][OH^-] = 1.0 	imes 10$$^{-14}$$

Réactions en milieu aqueux : Solutions, Équilibres et Réactions en Chimie Générale

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