Chemistry 1E03 Test One Solutions

Chemistry 1E03 Test One Solutions - CHEMISTRY 1E03 14...

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Version 1 Page 1 CHEMISTRY 1E03 14 OCTOBER 2011 Instructor: J. Barbier answers for version 1 McMASTER UNIVERSITY - TERM TEST # 1 - DURATION: 100 minutes QUESTIONS 1–20 ARE WORTH 2 MARKS EACH. 1. What is the total pressure (in atm) of a gas mixture containing 1.00 g of H 2 (g) and 8.00 g of Ar(g) in a 3.00 L vessel at 30 °C? (Assume that the gases are ideal.) A) 5.77 2 m B) 9.94 C) 17.3 D) 29.6 E) 0.571 P total V = n total RT = (n H2 + n Ar ) RT n H2 = 1/2.016 = 0.4960 n Ar = 8/39.95 = 0.2003 (argon is a monoatomic noble gas) 2. When 25.0 mL of a 0.245 M NaOH solution reacts with 20.0 mL of a 0.610 M HNO 3 solution, A) the resulting solution is neutral (neither acidic nor basic). B) the limiting reagent is HNO 3 and the resulting solution is acidic. C) the limiting reagent is NaOH and the resulting solution is acidic. 2 m D) the limiting reagent is NaOH and the resulting solution is basic. 1 m E) the limiting reagent is HNO 3 and the resulting solution is basic # moles NaOH = 0.245 0.025 = 0.0061 # moles HNO 3 = 0.610 0.020 = 0.012
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Version 1 Page 2 3. For atoms of the 29 Si isotope of silicon, identify the correct numbers of protons, neutrons and electrons (in that order): A) 14, 29, 14 1 m B) 29, 14, 29 C) 14, 15, 14 2 m D) 14, 14, 15 E) 15, 14, 15 See chapter 2 in textbook. In 29 Si, 29 = atomic mass number = # protons + # neutrons 4. What is the correct chemical formula for calcium nitrate ? A) Ca 2 NO 3 B) Ca(NO 3 ) 2 2 m C) Ca(NO 2 ) 2 D) CaNO 3 E) Ca 3 N 2 5. Identify the FALSE statement(s) concerning the following unbalanced reaction: Ca(s) + H 2 O(l) Ca 2+ (aq) + OH (aq) + H 2 (g) (i) The indicator phenolphthalein would turn pink as the reaction proceeds. (ii) Water acts as an oxidizing agent. (iii) Calcium gets oxidized. (iv) In the balanced reaction, two moles of H 2 (g) are produced for each mole of Ca consumed. (v) Hydrogen loses electrons. (vi) In the balanced reaction, two moles of H 2 O(l) react for each mole of Ca consumed. A) i, ii B) ii, iii C) v, vi 0.5 m D) iv 1 m E) iv, v 2 m The balanced reaction is Ca(s) + 2 H 2 O(l) Ca 2+ (aq) + 2 OH (aq) + H 2 (g) As the product solution is basic, phenolphtalein turns pink.
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Version 1 Page 3 6. Which one of the reactions below is not an acid-base reaction?: A) KHCO 3 (aq) + KOH(aq) K 2 CO 3 (aq) + H 2 O(l) B) Ag(s) + 2 HNO 3 (aq) AgNO 3 (aq) + NO 2 (g) + H 2 O(l) 2 m C) CH 3 COOH(aq) + H 2 O(l) CH 3 COO (aq) + H 3 O + (aq) D) NaH 2 PO 4 (aq) + Li 2 CO 3 (aq) Na + (aq) + HPO 4 2 (aq) + 2 Li + (aq) + HCO 3 (aq) E) BaO(s) + 2HCl(aq) BaCl 2 (aq) + H 2 O(l) 0.5 m Note that in E), the oxide anion O 2- acts as a base by accepting 2 H + ions. 7.
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This note was uploaded on 12/12/2011 for the course CHEM 1E03 taught by Professor Barbier during the Winter '08 term at McMaster University.

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Chemistry 1E03 Test One Solutions - CHEMISTRY 1E03 14...

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