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Chem1230_Exam2 KEY_V6_F2007

Chem1230_Exam2 KEY_V6_F2007 - Preliminaries Exam 2 KEY Chem...

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ü Preliminaries Exam 2 KEY Chem 1230 Fall 2007 1. Safety 20 pts SAME FOR ALL COLORS 4 questions @ 5 points each What are the safety precautions that are specific to each of the experiments : a. Experiment 4B: Ionic Reactions in Solution • do not use your finger as a stopper • be careful using acids and bases (if spilled notify TA, wash contaminated area) • caution using centrifuge • caution using barium solutions (wash hands) b. Experiment 5B: The Decomposition of Potassium Chlorate • KClO3 is a strong oxidizing agent, do not let it touch paper or the rubber stopper • be sure the clamp is open when you are heating (to avoid explosion) • be careful not to be burned by hot equipment or the Bunsen burner • be sure gas is turned off at end c. Experiment 6: Hess's Law • be careful using acids and bases (if spilled notify TA, wash contaminated area) • be careful not to be burned by hot equipment or the Bunsen burner • be sure gas is turned off at end d. Experiment 7: The Absorption of Cobalt (II) Chloride • do not pipet by mouth
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2. Expt 4B: Ionic Reactions in Solution 15 points ü a. (4) Molecular equation ü WHITE Write the balanced molecular equation for the reaction of calcium nitrate with sodium sulfate. Ca H NO 3 L 2 H aq L + Na 2 SO 4 H aq L || > 2 NaNO 3 H s L + CaSO 4 H s L ü BLUE Write the balanced molecular equation for the reaction of calcium nitrate with sodium sulfate. Ca H NO 3 L 2 H aq L + Na 2 SO 4 H aq L || > 2 NaNO 3 H s L + CaSO 4 H s L ü ORANGE Write the balanced molecular equation for the reaction of calcium nitrate with potassium sulfate. Ca H NO 3 L 2 H aq L + K 2 SO 4 H aq L || > 2 KNO 3 H s L + CaSO 4 H s L ü b. (4) Net ionic precipitation ü WHITE Write the balanced net ionic reaction of barium nitrate with potassium sulfate. Ba + 2 H aq L + SO 4 - 2 H aq L Ø BaSO 4 H solid L ü BLUE Write the balanced net ionic reaction of calcium nitrate with sodium sulfate. Ca + 2 H aq L + SO 4 - 2 H aq L Ø CaSO 4 H solid L ü ORANGE Write the balanced net ionic reaction of calcium nitrate with potassium sulfate. Chem1230_Exam2 KEY_V6_F2007.nb 2
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Ca + 2 H aq L + SO 4 - 2 H aq L Ø CaSO 4 H solid L ü c. (4) Net ionic solution ü WHITE Write the balanced net ionic reaction of hydrochloric acid with iron II hydroxide Fe H OH L 2 H s L + 2 H + H aq L Ø Fe + 2 H aq L + 2H 2 O ü BLUE Write the balanced net ionic reaction of hydrochloric acid with nickel hydroxide
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