Chapter 2 REVIEW Part 1 (Page 66)

1. 2. 3. 4. 5. 6.

1, 8, 5, 6s 3, 1, 2,1 C B C C

Part 2 (Pages 66–67)

7. (a) (b) (c) (d) (e) (f) (g) (h) (i) (j) 8. (a) (b) (c) (d) (e) (f) 9. (a) (b) (c) (d) (e) (f) (g)

very soluble, C12H22O11(aq) slightly soluble, CH4(g) slightly soluble, CaSO4(s) slightly soluble, C(s) very soluble, H2SO4(aq) very soluble, Na2CO3(aq) very soluble, NH4NO3(aq) slightly soluble, S8(s) slightly soluble, AgBr(s) slightly soluble, Mg(OH)2(aq) 2 NaOH(aq) + H2SO4(aq) ĺ 2 H2O(l) + Na2SO4(aq) double replacement C3H8(g) + 5 O2(g) ĺ 3 CO2(g) + 4 H2O(g) complete combustion 2 Al(s) + 3 CuCl2(aq) ĺ 3 Cu(s) + 2 AlCl3(aq) single replacement 2 NaOH(l) ĺ Na(l) + O2(g) + H2(g) simple decomposition Ca(s) + Cl2(g) ĺ CaCl2(s) formation Pb(NO3)2(aq) + 2 NaCl(aq) ĺ PbCl2(s) + 2 NaNO3(aq) double replacement simple decomposition 2 KCl(s) ĺ 2 K(l) + Cl2(g) formation Cu(s) + Cl2(g) ĺ CuCl2(s) complete combustion C5H12(g) + 8 O2(g) ĺ 5 CO2(g) + 6 H2O(g) double replacement AgNO3(aq) + NaCl(aq) ĺ AgCl(s) + NaNO3(aq) single replacement 2 Al(s) + 3 Cu(NO3)2(aq) ĺ 3 Cu(s) + 2 Al(NO3)3(aq) complete combustion 2 C8H18(l) + 25 O2(g) ĺ 16 CO2(g) + 18 H2O(g) simple decomposition 2 Al2O3(s) ĺ 4 Al(s) + 3 O2(g)

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Review Unit Solutions Manual

31

(h) formation Fe(s) + Br2(l) ĺ FeBr2(s) (i) double replacement Cu(NO3)2(aq) + 2 NaOH(aq) ĺ Cu(OH)2(s) + 2 NaNO3(aq) (j) double replacement 2 H3PO4(aq) + 3 Ca(OH)2(aq) ĺ 6 H2O(l) + Ca3(PO4)2(s) 10. (a) Four moles of ammonia gas react with seven moles of oxygen gas to produce four moles of nitrogen dioxide gas and six moles of water vapour. (b) Three moles of aqueous calcium chloride react with two moles of aqueous sodium phosphate to produce one mole of solid calcium phosphate and six moles of aqueous sodium chloride. (c) Two moles of liquid sodium chloride decompose into two moles of liquid sodium and one mole of chlorine gas. 11. (a) If a gas is collected and a burning-splint test is performed, resulting in a popping sound, then hydrogen gas is likely present. (b) If a litmus test is performed and blue litmus turns red as the reaction progresses, then an acid is present, consistent with the production of sulfuric acid. (c) If a conductivity test is performed and the solution conducts electricity, then ions are present, consistent with producing sodium chloride. 12. Prediction Since the reaction involved in this investigation involves an element with a compound, it can be classified as a single replacement reaction, according to the reaction type generalizations. Therefore, the expected products of this reaction are hydrogen gas and a solution of iron(II) chloride. Design A short piece of iron wire is placed in a dilute solution of hydrochloric acid and some diagnostic tests are carried out to identify the products. To identify the hydrogen, a sample of the gas is collected in a small test tube by the downward displacement of water. If a popping sound is heard when a burning wooden splint is placed into the test tube, hydrogen gas is likely present. To identify the presence of Fe2+(aq), five drops of the solution are removed and combined with 1–2 drops of a sodium hydroxide solution. The formation of a precipitate confirms that Fe2+(aq) is present. The controlled variable during this investigation is the temperature of the solutions.

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Review Unit Solutions Manual

Copyright © 2007 Thomson Nelson

Chapter 2 Review Key

Part 2. (Pages 66–67). 7. (a) very soluble, C12H22O11(aq). (b) slightly soluble, CH4(g). (c) slightly soluble, CaSO4(s). (d) slightly soluble, C(s). (e) very soluble ...

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