Lab Final (1)

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1046L

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Chemistry

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Feb 20, 2024

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Experiment 3 Pre-Lab Quiz Consider this reversible reaction: A+B ↔ C+D What happens to the forward and reverse reaction rates when equilibrium is achieved? The forward and reverse reaction take place with same rate Consider this reversible reaction: A+B ↔ C+D What happens to the reactant (A and B) and product (C and D) concentrations when equilibrium is achieved? The reactant (A and B ) and product (C and D ) have constant concentrations Consider the following exothermic reversible reaction at equilibrium: 2A ↔ B+C In which direction (left, right, neither) would it cause the system to shift if the concentration of A is decreased? left Consider the following exothermic reversible reaction at equilibrium: 2A ↔ B+C In which direction (left, right, neither) would it cause the system to shift if the concentration of B is increased? left Consider the following exothermic reversible reaction at equilibrium: 2A ↔ B+C In which direction (left, right, neither) would it cause the system to shift if the temperature decreased? right For the following equilibria, when chloride ion is added to the system what happens to the concentration of the silver ion? AgCl(s) ↔ Ag1+ (aq) + Cl1 -(aq) Decreases For the following equilibria, when NOCl is added to the system what happens to the temperature? 2NO(g) +Cl2(g) ↔ 2 NOCl(g) + 77 kJ decreases For the following equilibria, when NOCl is added to the system what happens to the concentration of NO? 2NO(g) +Cl2(g) ↔ 2 NOCl(g) + 77 kJ Increases For the following equilibria, when CH4 is added to the system what happens to the concentration of H2S? CH4(g) + 2H2S(g) ↔ CS2(g) + 4H2(g) decreases
For the following equilibria, when CH4 is added to the system what happens to the concentration of CS2? CH4(g) + 2H2S(g) ↔ CS2(g) + 4H2(g) increases For the following endothermic equilibria, when CH4 is added to the system, what happens to the temperature? CH4(g) + 2H2S(g) ↔ CS2(g) + 4H2(g) Decreases Experiment 6 Pre-Lab Quiz What happens to the molar solubility of an ionic compound when a common ion is present? decrease Based on the following equation: Ca(OH)2 (aq) ↔ Ca2+ (aq) + 2 OH-1 , if Ca2+ is added to Ca(OH)2 solution from a soluble calcium chloride, CaCl2. What happens to the solubility of Ca(OH)2? decrease Based on the following equation: Ca(OH)2 (aq) ↔ Ca2+ (aq) + 2 OH-1 , if Ca2+ is added to Ca(OH)2 solution from a soluble calcium chloride, CaCl2 , what happens to the pH? decrease In the titration of the hydroxide ion in the determination of the Ksp value for Ca(OH)2 suppose that the end point was overshot. What happens to the value of Ksp? Too high In the titration of the hydroxide ion in the determination of the Ksp value for Ca(OH)2, If water is added to the erlenmeyer flask in the course of the titration. What happens to the calculated value of Ksp? Correct/no change Experiment 7 Pre-Lab Quiz In set up for electrochemical cell, what is the purpose of the salt bridge? To prevent buildup of charge in either half-cell by providing limited ion flow What is the purpose of using of phenolphthalein in part B of this experiment? Phenolphthalein will change to pink color when the water is reduced In part B, the electrolysis of the aqueous potassium iodide solution, what would be the evidence if the iodide ion would be oxidized? If the iodide ions are oxidized the solution will turn yellow color In part B, the electrolysis of the aqueous cupric sulfate solution, what would be the evidence if the cupper ion would be reduced? If the cupper ions are reduced the graphite electrode shows discoloration
In part B, the electrolysis of the aqueous sodium chloride solution, what would be the evidence if the iodide ion would be oxidized? If the chloride ions are oxidized a faint odor of chlorine can be detected Experiment 8 Pre-Lab Quiz If your unknown is soluble in water and the resulting solution is basic to litmus, what conclusions do you draw regarding this unknown? Which of the following compounds could match your unknown? ethylamine If your unknown is soluble in water and the resulting solution is neutral to litmus, and a subsequent positive Ceric Nitrate Test is obtained, what conclusions do you draw regarding this unknown? Which of the following compounds could match your unknown? ethanol If your unknown is insoluble in water, and a subsequent positive Bromine Test is obtained, what conclusions do you draw regarding this unknown? Which of the following compounds could match your unknown? Pentene If your unknown is insoluble in water, and a subsequent negative Bromine Test is obtained, what conclusions do you draw regarding this unknown? Which of the following compounds could match your unknown? Hexane If your unknown is insoluble in water but soluble in NaOH, what conclusions do you draw regarding this unknown? Which of the following compounds could match your unknown? benzoic acid
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