WS4_key - Chem 142 Name _ Worksheet 4: Reactions in...

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Summer 2011 Page 1 of 5 Name ________________________________________ Section ________________ Worksheet 4: Reactions in Solution - Precipitation 1. Which of the following pairs of substances will mix? State why or why not. a. NaNO 3 and H 2 O Will mix. Sodium nitrate is ionic and water is polar b. C 6 H 14 (hexane) and H 2 O Will not mix. Hexane is nonpolar and water is polar c. I 2 and C 6 H 14 (hexane) Will mix. The iodine molecule is composed of two identical atoms. Therefore the electrons are distributed symmetrically. Iodine is therefore almost completely nonpolar. Hexane is also nonpolar. d. I 2 and H 2 O Will not mix. The iodine molecule is nonpolar, and water is polar. 2. Write the balanced molecular, complete ionic and net ionic equations for the reaction, if any, that occurs when aqueous solutions of the following are mixed. a. ammonium sulfate and barium nitrate (NH 4 ) 2 SO 4 (aq) + Ba(NO 3 ) 2 (aq) 2NH 4 NO 3 (aq) + BaSO 4 (s) 2NH 4 + (aq) + SO 4 2- (aq) + Ba 2+ (aq) + 2 NO 3 - (aq) 2NH 4 + (aq) + 2NO 3 - (aq) + BaSO 4 (s) SO 4 2- (aq) + Ba 2+ (aq) BaSO 4 (s) b. lead(II) nitrate and sodium chloride Pb(NO 3 ) 2 (aq) + 2NaCl (aq) 2NaNO 3 (aq) + PbCl 2 (s) Pb 2+ (aq) + 2NO 3 - (aq) + 2Na + (aq) + 2Cl - (aq) 2Na + (aq) 2NO 3 - (aq) + PbCl 2 (s) Pb 2+ (aq) + 2Cl - (aq) PbCl 2 (s) c. sodium phosphate and potassium nitrate All possible products are soluble, no reaction occurs. d. iron(III) chloride and sodium hydroxide FeCl 3 (aq) + 3NaOH (aq) 3NaCl (aq) + FeOH 3 (s) Fe 2+ (aq) + 3Cl - (aq) + 3Na + (aq) + 3OH - (aq) 3Na + (aq) + 3Cl - (aq) + FeOH 3 (s) Fe 2+ (aq) + 3OH - (aq) FeOH 3 (s) e. sodium bromide and rubidium chloride
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WS4_key - Chem 142 Name _ Worksheet 4: Reactions in...

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