Question

EXTRA CREDIT. Which of the following metals will react in acid solutions to form H2 gas? [You
must select all correct answers.]
A) Mg
B) Al
C) Fe
D) Cu
E) Ag
21. EXTRA CREDIT. Which of the following metals will be oxidized by Zn(NO3)2? [You must select
all correct answers.]
A) Mg
B) Al
C) Fe
D) Cu
E) Ag
22. EXTRA CREDIT. What is the oxidation number of sulfur in Na2SO4
A) -2
B) 0
C) +2
D) +4
E) +6
23. The total concentration of ions in a 0.250 M solution of HCl is
A) 0
B) 0.125 M
C) 0.250 M
D) 0.500 M
E) 0.750 M

If 65 ml of a 0.430 M NaOH solution is diluted to 500 mL, what is the concentration of the diluted
solution?
A) 0.215 M
B) 0.30 M
C) 0.023 M
D) 3.3 M
E) 0.056 M
25. The net ionic equation for the reaction between aqueous nitric acid and aqueous sodium hydroxide
is
A) H
+
(aq) + HNO3 (aq) + 2OH- (aq) → 2H2O (l) + NO3
- (aq)
B) HNO3 (aq) + NaOH (aq) → NaNO3 (aq) + H2O (l)
C) H+(aq) + OH- (aq) → H2O(l)
D) HNO3 (aq) + OH- (aq) → NO3
- (aq) + H2O (l)
E) H+ (aq) + Na+ (aq) + OH- (aq) → H2O (l) + Na+ (aq)