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10 Nov 2019
When equal molar amounts of these sets of compounds are mixed in aqueous solution, which will form a buffer solution? (A) HCl with NaCl (B) HCl with NaOH (C) NaOH with Na_2 CO_3 (D) NH_3 with NH_4 Cl The pH of a 0.0100 M solution of a weak acid, HA, is 3.76. What is the percent ionization of HA for this solution? (A) 0.017% (B) 0.58% (C) 1.7% (D) 5.8% Which is the most prevalent species in a 0.25 M aqueous solution of phosphoric acid, H_3 PO_4? (A) H_3 PO_4 (B) H_2 PO_4^- (C) HPO_4^2- (D) H_3 O^+ Which titration has an equivalence point with a basic pH? (A) titrating NH_3(aq) with HCl(aq) (B) titrating HNO_3(aq) with KOH(aq) (C) titrating HNO_2(aq) with KOH(aq) (D) titrating HClO_4 (aq) with Ca(OH)_2 (aq) Which figure best represents a concentrated aqueous solution of HI? (Water molecules are not shown.) A current of 0.150 A is passed through an aqueous CuSO_4 solution for 10.0 minutes. What mass of Cu is plated out? (Assume 100% yield.) (A) 0.000494 g (B) 0.0592 g (C) 0.0296 g (D) 0.0148 g The oxidation number of carbon changes from _____ in this redox reaction: 2NnO_4^- (aq) + 3C_2 O_4^2- (aq) + 4OH^- (aq) 2MNO_2 (s) + 6CO_3^2 (aq) + 2H O(I) (A) +6 to +4 (B) +4 and +3 (C) +3 to +4 (D) +3 to +6 Which species is the most powerful reducing agent at standard conditions? Na^+ (aq) + e^- rightarrow Na(s) E degree = -2.71 V Fe^2+ (aq) + 2e^- rightarrow Fe(s) E degree = -0.45 V O_2 (g) + 2H_2 O(l) + 4e^- rightarrow 4OH^- (aq) E degree = 0.40 V I_2 (s) + 2e^- rightarrow 2I^- (aq) E degree = 0.54 V (A) Na(s) (B) Fe^2+ (aq) (C) OH^- (aq) (D) I_2 (s) For this galvanic cell reaction 3HNO_2 (aq) + BrO_3^- (aq) rightarrow 3H^+(aq) + 3NO_3^- (aq) + Br^- (aq) the Nernst equation implies that the galvanic cell will have a more negative voltage if you: (A) increase the pH. (B) decrease the Br^- concentration (C) increase the BrO_3^-, concentration. (D) increase the NO_3^- concentration. The reaction Zn(s) + Ni^2+ (aq) rightarrow Zn^2 (aq) + Ni(s) occurs in the galvanic cell shown. Which statement is true? (A) Electrons flow to the Zn electrode. Na^+ ions flow toward the Ni electrode. (B) Electrons flow to the Zn electrode. Na^+ ions flow toward the Zn electrode. (C) Electrons flow to the Ni electrode. Na^+ ions flow toward the Ni electrode. (D) Electrons flow to the Ni electrode. Na^+ ions flow toward the Zn electrode.
When equal molar amounts of these sets of compounds are mixed in aqueous solution, which will form a buffer solution? (A) HCl with NaCl (B) HCl with NaOH (C) NaOH with Na_2 CO_3 (D) NH_3 with NH_4 Cl The pH of a 0.0100 M solution of a weak acid, HA, is 3.76. What is the percent ionization of HA for this solution? (A) 0.017% (B) 0.58% (C) 1.7% (D) 5.8% Which is the most prevalent species in a 0.25 M aqueous solution of phosphoric acid, H_3 PO_4? (A) H_3 PO_4 (B) H_2 PO_4^- (C) HPO_4^2- (D) H_3 O^+ Which titration has an equivalence point with a basic pH? (A) titrating NH_3(aq) with HCl(aq) (B) titrating HNO_3(aq) with KOH(aq) (C) titrating HNO_2(aq) with KOH(aq) (D) titrating HClO_4 (aq) with Ca(OH)_2 (aq) Which figure best represents a concentrated aqueous solution of HI? (Water molecules are not shown.) A current of 0.150 A is passed through an aqueous CuSO_4 solution for 10.0 minutes. What mass of Cu is plated out? (Assume 100% yield.) (A) 0.000494 g (B) 0.0592 g (C) 0.0296 g (D) 0.0148 g The oxidation number of carbon changes from _____ in this redox reaction: 2NnO_4^- (aq) + 3C_2 O_4^2- (aq) + 4OH^- (aq) 2MNO_2 (s) + 6CO_3^2 (aq) + 2H O(I) (A) +6 to +4 (B) +4 and +3 (C) +3 to +4 (D) +3 to +6 Which species is the most powerful reducing agent at standard conditions? Na^+ (aq) + e^- rightarrow Na(s) E degree = -2.71 V Fe^2+ (aq) + 2e^- rightarrow Fe(s) E degree = -0.45 V O_2 (g) + 2H_2 O(l) + 4e^- rightarrow 4OH^- (aq) E degree = 0.40 V I_2 (s) + 2e^- rightarrow 2I^- (aq) E degree = 0.54 V (A) Na(s) (B) Fe^2+ (aq) (C) OH^- (aq) (D) I_2 (s) For this galvanic cell reaction 3HNO_2 (aq) + BrO_3^- (aq) rightarrow 3H^+(aq) + 3NO_3^- (aq) + Br^- (aq) the Nernst equation implies that the galvanic cell will have a more negative voltage if you: (A) increase the pH. (B) decrease the Br^- concentration (C) increase the BrO_3^-, concentration. (D) increase the NO_3^- concentration. The reaction Zn(s) + Ni^2+ (aq) rightarrow Zn^2 (aq) + Ni(s) occurs in the galvanic cell shown. Which statement is true? (A) Electrons flow to the Zn electrode. Na^+ ions flow toward the Ni electrode. (B) Electrons flow to the Zn electrode. Na^+ ions flow toward the Zn electrode. (C) Electrons flow to the Ni electrode. Na^+ ions flow toward the Ni electrode. (D) Electrons flow to the Ni electrode. Na^+ ions flow toward the Zn electrode.
Lelia LubowitzLv2
17 Jan 2019