Exam 2 solution key

Exam 2 solution key - CHEM101-003/Exam 2/Oct. 18, 2011 Exam...

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CHEM101-003/Exam 2/Oct. 18, 2011 1 Exam 2 solution key 1. Aqueous solutions of a compound did not form precipitates with Cl - , Br - , I - , SO 4 2- , CO 3 2- , PO 4 3- , OH - , or S 2- . This highly water-soluble compound produced the foul-smelling gas H 2 S when the solution was acidified. This compound is __________. A) Pb(NO 3 ) 2 B) (NH 4 ) 2 S C) KBr D) Li 2 CO 3 E) AgNO 3 Answer: B Page Ref: Sec. 4.2,4.3 A&E are ruled out due to solubility.Production of H2S on acidification means it is a sulfide. Therefore, B. 2. The balanced molecular equation for complete neutralization of H 2 SO 4 by KOH in aqueous solution is __________. A) 2H + (aq) + 2OH - (aq) 2 H 2 O (l) B) 2H + (aq) + 2KOH (aq) 2 H 2 O (l) + 2K + (aq) C) H 2 SO 4 (aq) + 2OH - (aq) 2 H 2 O (l) + SO 4 2- (aq) D) H 2 SO 4 (aq) + 2KOH (aq) 2 H 2 O (l) + K 2 SO 4 (s) E) H 2 SO 4 (aq) + 2KOH (aq) 2 H 2 O (l) + K 2 SO 4 (aq) Answer: E Page Ref: Sec. 4.2 3. The net ionic equation for formation of an aqueous solution of Al(NO 3 ) 3 via mixing solid Al(OH) 3 and aqueous nitric acid is __________. A) Al(OH) 3 (s) + 3HNO 3 (aq) 3 H 2 O (l) + Al(NO 3 ) 3 (aq) B) Al(OH) 3 (s) + 3NO 3 - (aq) 3OH - (aq) + Al(NO 3 ) 3 (aq) C) Al(OH) 3 (s) + 3NO 3 - (aq) 3OH - (aq) + Al(NO 3 ) 3 (s) D) Al(OH) 3 (s) + 3H + (aq) 3 H 2 O (l) + Al 3+ (aq) E) Al(OH) 3 (s) + 3HNO 3 (aq) 3 H 2 O (l) + Al 3+ (aq) + NO 3 - (aq) Answer: D Page Ref: Sec. 4.2 4. Which one of the following is a weak acid? A) HNO 3 B) HCl C) HI D) HF E) HClO 4 Answer: D Page Ref: Sec. 4.3
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CHEM101-003/Exam 2/Oct. 18, 2011 2 5. In which reaction does the oxidation number of oxygen increase? A) Ba(NO 3 ) 2 (aq) + K 2 SO 4 (aq) BaSO 4 (s) + 2 KNO 3 (aq) B) HCl (aq) + NaOH (aq) NaCl (aq) + H 2 O ( l ) C) MgO (s) + H 2 O ( l ) Mg(OH) 2 (s) D) 2 SO 2 (g) + O 2 (g) 2 SO 3 (g) E) 2 H 2 O ( l ) 2 H 2 (g) + O 2 (g) Answer: E Page Ref: Sec. 4.4 6. Of the choices below, which would be the best for the lining of a tank intended for use in storage of hydrochloric acid? A) copper B) zinc C) nickel D) iron E) tin Answer: A Page Ref: Sec. 4.4 Of these only copper is below hydrogen on the activity series. 7. Based on the activity series, which one of the reactions below will occur? A) Fe (s) + ZnCl 2 (aq) FeCl 2 (aq) + Zn (s) B) Mn (s) + NiCl 2 (aq) MnCl 2 (aq) + Ni (s) C) Pb (s) + NiI 2 (aq) PbI 2 (aq) + Ni (s) D) SnBr 2 (aq) + Cu (s) CuBr 2 (aq) + Sn (s) E) None of the reactions will occur. Answer: B Page Ref: Sec. 4.4 Of these, only Ni ion can oxidize Mn based on positions in the activity series. 8. Oxidation is the __________ and reduction is the __________. A) gain of oxygen, loss of electrons B) loss of oxygen, gain of electrons C) loss of electrons, gain of electrons D) gain of oxygen, loss of mass E) gain of electrons, loss of electrons Answer: C Page Ref: Sec. 4.4 9. What volume (mL) of a concentrated solution of magnesium chloride (9.00 M) must be diluted to 350.0 mL to make a 2.75 M solution of magnesium chloride? Please place answer on answer sheet.
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Exam 2 solution key - CHEM101-003/Exam 2/Oct. 18, 2011 Exam...

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