General Chemistry I
Test 2 Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq)
C. MgCl2(aq) + K2CO 3 (aq) D. CaSO4 (aq) + (NH4)3 PO4(aq)
1)
A) A
B) C
C) B
D) D 2)
2) The balanced molecular equation for complete neutralization of H2 SO4 by KOH in aqueous solution is __________. A) 2H+ (aq) + 2OH- (aq)
2H2O (l)
B) H2 SO4 (aq) + 2KOH (aq) C) H2 SO4 (aq) + 2OH- (aq) D) 2H+ (aq) + 2KOH (aq) E) H2 SO4 (aq) + 2KOH (aq)
2H2 O (l) + K2SO4 (s) 2H2 O (l) + SO42- (aq) 2H2O (l) + K2 SO4 (aq)
2H2O (l) + 2K+ (aq)
3) How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide? A) 1.08 × 1023 B) 1.00 × 1024 C) 1.08 × 1024 D) 6.02 × 1024 E) 6.02 × 1023
3)
1
ESSAY. Write your answer in the space provided or on a separate sheet of paper. 4) Which element is oxidized and which element is reduced in the following reaction? Slect your reaction
Zn(s) + 2 HCl(aq) Zn is oxidized (0 Fe2O 3(s) + 2 Al(s) Fe is reduced (3+
ZnCl 2(aq) + H 2(g) 2+) and H is reduced (+1 ÷ 0) 2 Fe(s) + Al2O 3(s) 0) and Al is oxidized (0 ÷ 3+)
14 HNO3 + 3 Cu2O 6 Cu(NO3)2 + 2 NO + 7 H2O N is reduced (5+ 2+) and Cu is oxidized (1+ ÷ 2+) I–– + 2 MnO4– + H2O IO3– + 2 MnO 2 + 2 OH–– I is oxidized (1–– 5+) and Mn is reduced (7+ ÷ 4+)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 5) Which one of the following is a correct expression for molarity? A) mol solute/mL solvent B) mol solute/kg solvent C) mmol solute/mL solution D) mol solute/L solvent E) µmol solute/L solution 6) Which one of the following is a weak acid? A) HI B) HNO3 C) HClO4 7) The mass % of F in the binary compound KrF2 is __________. A) 68.80 B) 81.52 C) 45.38 5)
D) HF
E) HCl
6)
7) D) 31.20 E) 18.48 8)
8) When aqueous solutions of __________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Find the combination that will give a gas as a product A. AgNO3(aq) + NaI(aq) B. HCl(aq) + Na2CO3 (aq)
C. MgCl2(aq) + K2CO 3 (aq) D. CaSO4 (aq) + (NH4)3 PO4(aq)
1)
A) A
B) C
C) B
D) D 2)
2) The balanced molecular equation for complete neutralization of H2 SO4 by KOH in aqueous solution is __________. A) 2H+ (aq) + 2OH- (aq)
2H2O (l)
B) H2 SO4 (aq) + 2KOH (aq) C) H2 SO4 (aq) + 2OH- (aq) D) 2H+ (aq) + 2KOH (aq) E) H2 SO4 (aq) + 2KOH (aq)
2H2 O (l) + K2SO4 (s) 2H2 O (l) + SO42- (aq) 2H2O (l) + K2 SO4 (aq)
2H2O (l) + 2K+ (aq)
3) How many sulfur dioxide molecules are there in 1.80 mol of sulfur dioxide? A) 1.08 × 1023 B) 1.00 × 1024 C) 1.08 × 1024 D) 6.02 × 1024 E) 6.02 × 1023
3)
1
ESSAY. Write your answer in the space provided or on a separate sheet of paper. 4) Which element is oxidized and which element is reduced in the following reaction? Slect your reaction
Zn(s) + 2 HCl(aq) Zn is oxidized (0 Fe2O 3(s) + 2 Al(s) Fe is reduced (3+
ZnCl 2(aq) + H 2(g) 2+) and H is reduced (+1 ÷ 0) 2 Fe(s) + Al2O 3(s) 0) and Al is oxidized (0 ÷ 3+)
14 HNO3 + 3 Cu2O 6 Cu(NO3)2 + 2 NO + 7 H2O N is reduced (5+ 2+) and Cu is oxidized (1+ ÷ 2+) I–– + 2 MnO4– + H2O IO3– + 2 MnO 2 + 2 OH–– I is oxidized (1–– 5+) and Mn is reduced (7+ ÷ 4+)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 5) Which one of the following is a correct expression for molarity? A) mol solute/mL solvent B) mol solute/kg solvent C) mmol solute/mL solution D) mol solute/L solvent E) µmol solute/L solution 6) Which one of the following is a weak acid? A) HI B) HNO3 C) HClO4 7) The mass % of F in the binary compound KrF2 is __________. A) 68.80 B) 81.52 C) 45.38 5)
D) HF
E) HCl
6)
7) D) 31.20 E) 18.48 8)
8) When aqueous solutions of __________