1. Regarding the acid-base neutralization reaction

Mg(OH)₂ (aq) + 2 HNO₃ (aq) ---» 2 H₂O (l) + Mg(NO₃)₂ (aq),
which of the following statements is true?

Mg(OH)₂ is the acid and HNO₃ is the salt
Mg(OH)₂ is the base and H₂O is the salt
HNO₃ is the base and Mg(NO₃)₂ is the salt
HNO₃ is the acid and Mg(NO₃)₂ is the salt

2. In the combustion reaction shown below, 26.0 g of C₂H₂ (g)was burned, and 72.4 g of CO₂ (g) was produced. Calculate the percent yield.

2 C₂H₂ (g) + 5O₂ (g)­→ 4 CO₂ (g) + 2 H₂O (g)

100%
88%
82.3%
86.5%

3. Which of the following statements is true?

Real gases occupy no space at all.
Ideal gases exist in nature.
Real gas molecules have absolutely no attractive forces between them.
Collisions between real gas molecules are mostly, but not always entirely, elastic.

4. In the acid-base neutralization reaction Pb(NO₃)₂ (aq) + 2 KI (aq) ---» 2 KNO₃ (aq) + PbI₂ (s), what are the spectator ions?
Pb+2 and NO3 -1
Pb+2 and I -1
K +1 and I -1
K +1 and NO3 -1

5. In a net ionic equation, ionic charges are not written or shown for __________.
Spectator ions
Oxidizing agents
Reducing agents
Precipitates

6. In the reaction below, which substance gains electrons?

2 Fe₂O­₃ (s)+ 3 C (s)→ 4 Fe (s) + 3 CO₂ (g)

7. In the reaction below, which substance is the reducing agent?

2 Fe₂O­₃ (s)+ 3 C (s)→ 4 Fe (s) + 3 CO₂ (g)
Fe2O­3
C
Fe
CO2

8. After four half-lives, what percentage of the original radioactive sample remains?
25%
0.4%
6.25%
40%

9. 25 mL of 0.80 M HCl was titrated with NaOH. If 37.5 mL of NaOH were required to reach the endpoint, what was the molarity of the NaOH?
1172 M
750 M
1.2 M
0.53 M