EXAM 3 CHEM 1310 WS09 Key Version #1
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1 EXAM 3 CHEM 1310 WS09 Key Version #1 1. (p. 87) How many grams of sodium fluoride (used in water fluoridation and manufacture of insecticides) are needed to form 485 g of sulfur tetrafluoride? 3SCl 2 (l) + 4NaF(s) SF 4 (g) + S 2 Cl 2 (l) + 4NaCl(s) a g b g c. 205 g d g E. 754 g Silberberg Stoichiometry... #40 2. (p. 77) A compound containing chromium and silicon contains mass percent chromium. Determine its empirical formula. a. Cr 3 Si b. CrSi 3 c. Cr 2 S d. Cr 2 Si 3 E. Cr 3 Si 2 Silberberg Stoichiometry... #25
2 3. (p. 119) Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) H 2 O(l) + LiBr(aq) a. LiOH(aq) Li + (aq) + OH - (aq) b. Li + (aq) + Br - (aq) LiBr(aq) C. H + (aq) + OH - (aq) H 2 O(l) d. Li + (aq) + OH - (aq) + H + (aq) + Br - (aq) H 2 O(l) + LiBr(aq) e. HBr(aq) H + (aq) + Br - (aq) Silberberg The... #29 4. (p. 125) Calculate the oxidation number of the chlorine in perchloric acid, HClO 4, a strong oxidizing agent. a. +4 b. None of these is the correct oxidation number. c. +5 d. -1 E. +7 Silberberg The... #34 5. (p. 112) Which of the following is most soluble in water? a. hexane, C 6 H 14 b. ethane, C 2 H 4 C. potassium nitrate, KNO 3 d. carbon tetrachloride, CCl 4 e. benzene, C 6 H 6 Silberberg The... #8
3 6. (p. 82) Balance the following equation: Ca 3 (PO 4 ) 2 (s) + SiO 2 (s) + C(s) CaSiO 3 (s) + CO(g) + P 4 (s) a. 2Ca 3 (PO 4 ) 2 (s) + 6SiO 2 (s) + 10C(s) 6CaSiO 3 (s) + 10CO(g) + 4P 4 (s) B. 2Ca 3 (PO 4 ) 2 (s) + 6SiO 2 (s) + 10C(s) 6CaSiO 3 (s) + 10CO(g) + P 4 (s) c. Ca 3 (PO 4 ) 2 (s) + 3SiO 2 (s) + 8C(s) 3CaSiO 3 (s) + 8CO(g) + P 4 (s) d. Ca 3 (PO 4 ) 2 (s) + 3SiO 2 (s) + 14C(s) 3CaSiO 3 (s) + 14CO(g) + P 4 (s) e. Ca 3 (PO 4 ) 2 (s) + 3SiO 2 (s) + 8C(s) 3CaSiO 3 (s) + 8CO(g) + 2P 4 (s) Silberberg Stoichiometry... #35 7. (p. 116) Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(ii) nitrate. a. NH 4 NO 3 b. NH 4 (NO 3 ) 2 C. CuS d. CuSO 4 e. Cu 2 S Silberberg The... #18 8. (p. 111) How many sodium ions are present in 325 ml of M Na 2 SO 4? a Na ions b Na ions c Na ions d Na ions E Na ions Silberberg The... #7
4 9. (p. 120) A mol sample of Ca(OH) 2 requires ml of aqueous HCl for neutralization according to the reaction below. What is the concentration of the HCl? Equation: Ca(OH) 2 (s) + 2HCl(aq) CaCl 2 (aq) + H 2 O(l) a. None of these choices is correct. b M c M d M E M Silberberg The... # (p. 94) Tetraphosphorus hexaoxide ( = g/mol) is formed by the reaction of phosphorus with oxygen gas. P 4 (s) + 3O 2 (g) P 4 O 6 (s) If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P 4 O 6, what is the percent yield for the reaction? a. 38.0% b. 16.3% C. 48.8% d. 57.5% e. 32.4% Silberberg Stoichiometry... # (p. 125) Which one of the following is a redox reaction? a. Na 2 CO 3 (s) + 2HCl(aq) 2NaCl(aq) + CO 2 (g) + H 2 O(l) b. Ba 2+ (aq) + SO 4 2- (aq) BaSO 4 (s) c. H 2 O(l) H + (aq) + OH - (aq) D. 2Na(g) + Cl 2 (g) 2NaCl(s) e. K 2 Cr 2 O 7 (aq) + 2KOH(aq) 2K 2 CrO 4 (aq) + H 2 O(l) Silberberg The... #43
5 12. (p. 114) In the following reaction, what ions, if any, are spectator ions? Pb(NO 3 ) 2 (aq) + 2NaCl(aq) PbCl 2 (s) + 2NaNO 3 (aq) A. Na + (aq), NO 3 - (aq) b. Pb 2+ (aq), NO 3 - (aq) c. There are no spectator ions d. Pb 2+ (aq), Cl - (aq) e. Na + (aq), Cl - (aq) Silberberg The... # (p. 120) Automobile batteries use 3.0 M H 2 SO 4 as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 ml of battery acid? H 2 SO 4 (aq) + 2NaOH(aq) 2H 2 O(l) + Na 2 SO 4 (aq) a L b L c L D. 1.1 L e L Silberberg The... # (p. 77) Hydroxylamine hydrochloride is a powerful reducing agent which is used as a polymerization catalyst. It contains 5.80 mass % H, mass % N, mass % O, and mass % Cl. What is its empirical formula? a. H 4 NOCl 2 B. H 4 NOCl c. H 2 N 7 O 8 Cl 18 d. HN 3 O 4 Cl 9 e. H 2 N 2 O 2 Cl Silberberg Stoichiometry... #29
6 15. (p. 125) Identify the oxidizing agent in the following redox reaction. Hg 2+ (aq) + Cu(s) Cu 2+ (aq) + Hg(l) A. Hg 2+ (aq) b. Cu(s) c. Hg 2+ (aq) and Cu 2+ (aq) d. Hg(l) e. Cu 2+ (aq) Silberberg The... # (p. 116) Select the precipitate that forms when the following reactants are mixed. Na 2 CO 3 (aq) + BaCl 2 (aq) A. BaCO 3 b. NaCl 2 c. Ba 2 CO 3 d. NaCl e. BaO Silberberg The... # (p. 111) How many moles of ions are released when 0.27 mol of cobalt(ii) chloride, CoCl 2, is dissolved in water? a mol b mol c mol d mol E mol Silberberg The... #3
7 18. (p. 116) Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CuCl 2 (aq) + Na 2 CO 3 (aq) a. copper(i) carbonate, Cu 2 CO 3 b. copper(ii) carbonate, Cu 2 CO 3 c. copper(i) carbonate, CuCO 3 D. copper(ii) carbonate, CuCO 3 e. sodium chloride, NaCl Silberberg The... # (p. 111) How many moles of H + (aq) ions are present in 750 ml of 0.65 M hydrochloric acid? a mol b. 1.2 mol C mol d mol e mol Silberberg The... #5 20. (p. 111) Potassium carbonate, K 2 CO 3, sodium iodide, NaI, magnesium oxide, MgO, methanol, CH 3 OH, and ammonium chloride, NH 4 Cl, are soluble in water. Which produces the largest number of dissolved particles per mole of dissolved solute? a. NH 4 Cl b. MgO c. NaI D. K 2 CO 3 e. CH 3 OH
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