Chem 134 Exam 3 (Take Home)
Questions & Answers (Grade A+)
The net ionic equation for the dissolution of zinc metal (Zn) in
aqueous hydrobromic acid (HBr) is
(a) Zn(s) + 2H+ (aq) -- Zn2+(aq) + H2(g)
(b) Zn(s) + 2HBr-(aq) -- ZnBr2(aq) +2H+(aq)
(c) 2Zn(s) + H+(aq) -- 2Zn2+(aq) + H2(aq)
(d) Zn(s) + 2HBr(aq) -- ZnBr2(s) + 2H+(aq)
(e) Zn(s) + 2Br-(aq) -- ZnBr2(aq) -
correct answer ✅(D) Zn(s) + 2HBr(aq) -- ZnBr2(s) + 2H+(aq)
What mass (g) of potassium chloride is contained in 430.0 mL of a
potassium chloride solution that has a chloride ion concentration of
0.193 M?
(a) 0.386
(b) 0.0643
(c) 0.0830
(d) 6.19
(e) 12.37 -
correct answer ✅(D) 6.19
Questions & Answers (Grade A+)
The net ionic equation for the dissolution of zinc metal (Zn) in
aqueous hydrobromic acid (HBr) is
(a) Zn(s) + 2H+ (aq) -- Zn2+(aq) + H2(g)
(b) Zn(s) + 2HBr-(aq) -- ZnBr2(aq) +2H+(aq)
(c) 2Zn(s) + H+(aq) -- 2Zn2+(aq) + H2(aq)
(d) Zn(s) + 2HBr(aq) -- ZnBr2(s) + 2H+(aq)
(e) Zn(s) + 2Br-(aq) -- ZnBr2(aq) -
correct answer ✅(D) Zn(s) + 2HBr(aq) -- ZnBr2(s) + 2H+(aq)
What mass (g) of potassium chloride is contained in 430.0 mL of a
potassium chloride solution that has a chloride ion concentration of
0.193 M?
(a) 0.386
(b) 0.0643
(c) 0.0830
(d) 6.19
(e) 12.37 -
correct answer ✅(D) 6.19
