Final.FormB.Answers.F07

Final.FormB.Answers.F07 - 1 Final.FormB.Answers.F07...

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1 Final.FormB.Answers.F07 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. The following problems (1-39) are worth 3 points each. 1) What is the concentration of nitrate ions in a 0.125 M Ba(NO 3 ) 2 solution? A) 0.125 M B) 0.250 M C) 0.375 M D) 0.0625 M E) 0.160 M 2) Which of the following is considered a STRONG electrolyte? A) KNO 3 B) AgCl C) CH 3 OH D) C 12 H 22 O 11 E) HC 2 H 3 O 2 3) According to the following reaction, how many moles of Fe(OH) 2 can form from 175.0 mL of 0.227 M NaOH solution? Assume that there is excess FeCl 2 . FeCl 2 (aq) + 2 NaOH(aq) Fe(OH) 2 (s) + 2 NaCl(aq) A) 5.03 × 10 -2 moles B) 3.97 × 10 -2 moles C) 6.49 × 10 -2 moles D) 2.52 × 10 -2 moles E) 1.99 × 10 -2 moles 4) Which of the following compounds is insoluble in water? A) PbI 2 B) BaS C) MgSO 4 D) (NH 4 ) 2 CO 3 E) All of these compounds are soluble in water. 5) Give the net ionic equation for the reaction (if any) that occurs when aqueous solutions of K 2 S and Fe(NO 3 ) 2 are mixed. A) Fe 2+ (aq) + S 2- (aq) FeS(s) B) K + (aq) + NO 3 -(aq) KNO 3 (s) C) Fe 2+ (aq) + S 2- (aq) + 2 K + (aq) + 2 NO 3 - (aq) FeS(s) + 2 K + (aq) + 2 NO 3 - (aq) D) Fe 2+ (aq) + S 2- (aq) + 2 K + (aq) + 2 NO 3 - (aq) Fe 2+ (aq) + S 2- (aq) + 2 KNO 3 (s) E) No reaction occurs.
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2 6) Which of the following statements about isotopes is TRUE? A) An isotope of an atom with a larger number of neutrons is larger than an isotope of the same atom that contains fewer neutrons. B) Isotopes of the same element have the same mass. C) Isotopes of the same element don't usually have the same properties. D) Some elements have 3 or more naturally occurring isotopes. E) Isotopes of the same element differ only in the number of electrons they contain. 7) Determine the name for P 4 O 10 . A) phophorus oxide B) phosphorus (II) oxide C) diphosphorus pentaoxide D) phosphorus (IV) oxide E) tetraphophorus decaoxide 8) According to the following balanced reaction, how many moles of KO 2 are required to exactly react with 5.44 moles of H 2 O? 4 KO 2 (s) + 2 H 2 O(l) 4 KOH(s) + 3O 2 (g) A) 8.33 moles KO 2 B) 4.87 moles KO 2 C) 2.72 moles KO 2 D) 16.7 moles KO 2 E) 10.9 moles KO 2 9) Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N 2 O 4 and 45.0 g N 2 H 4 . Some possibly useful molar masses are as follows: N 2 O 4 = 92.02 g/mol, N 2 H 4 = 32.05 g/mol. N 2 O 4 (l) + 2 N 2 H 4 (l) 3 N 2 (g) + 4 H 2 O(g) A) LR = N 2 O 4 , 105 g N 2 formed B) LR = N 2 O 4 , 45.7 g N 2 formed C) No LR, 45.0 g N 2 formed D) LR = N 2 H 4 , 13.3 g N 2 formed E) LR = N 2 H 4 , 59.0 g N 2 formed 10) How many milliliters of a 0.184 M NaNO 3 solution contain 0.113 moles of NaNO 3 ? A) 163 mL
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This note was uploaded on 04/09/2008 for the course CHEM 1A taught by Professor Van koppen during the Fall '07 term at UCSB.

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Final.FormB.Answers.F07 - 1 Final.FormB.Answers.F07...

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