Chapter 4A TAVSS

Chapter 4A TAVSS - CHEM 161-2007 A MOLE IN AQUEOUS...

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A MOLE CHEM 161-2007 CHAPTER 4A - CHEMICAL REACTIONS IN AQUEOUS SOLUTIONS PRACTICE PROBLEMS DR. ED TAVSS Strong and weak electrolytes Precipitation reactions Acid-Base reactions (Also, see Chapter 3B, Solution Conc.: Molarity)
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Strong and weak electrolytes CHEM 161-2006 EXAM II TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY STRONG AND WEAK ELECTROLYTES 12. Which one of the following 0.10 M aqueous solutions is a non-electrolyte? (a) NaCl (b) MgSO 4 (c) CH 3 COOH (d) C 12 H 22 O 11 (e) HCl (a) NaCl is a soluble salt. All soluble salts are strong electrolytes. (b) MgSO 4 is a soluble salt. All soluble salts are strong electrolytes. (c) CH 3 COOH is a weak acid. All weak acids are weak electrolytes. (d) C 12 H 22 O 11 is an organic molecule. Virtually all organic molecules, except for organic acids, are non-electrolytes. (e) HCl is a strong acid. All strong acids are strong electrolytes. 18. Chem 161-2004 Exam I Zumdahl 6 th edition Chapter 4 Strong and Weak Electrolytes Consider two organic molecules, ethanol and benzene. One dissolves in water and the other does not. Why? A. One is ionic, the other is not. B. They have different molar masses. C. Choose this choice if more than one of the other reasons given is correct. D . One contains a polar O-H bond and the other does not E. One is an electrolyte, the other is not A. Neither one is ionic. B. Although they have different molar masses, molar mass is only a small factor in determining solubility. D. The ethanol is a polar molecule. Water is a polar molecule. Polar molecules dissolve in water. Benzene is not polar. Non-polar molecules do not dissolve in water. E. They are both organic molecules. Neither one is an organic acid or base. Hence, neither one ionizes, and therefore neither one is an electrolyte.
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CHEM 161-1999 FINAL EXAM + ANSWERS CHAPTER 4 - TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY STRONG AND WEAK ELECTROLYTES 14. Which one of the following is a weak electrolyte when dissolved in water? A. Hydrogen chloride. B . Ammonia. C. Sodium sulfate. D. Perchloric acid. E. Potassium hydroxide. CHEM 161-2001-HOURLY EXAM I + ANSWERS ZUMDAHL CHAPTER 4 - TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY STRONG AND WEAK ELECTROLYTES 18. Of the substances below, which ones are the weak electrolytes? V. AgCl W. glucose (C 6 H 12 O 6 ) X. HI Y. H 3 PO 4 Z. NH 3 A. none of them B. all of them C. W and Y D . Y and Z E. V and W A strong electrolyte is one that is available in solution almost exclusively as ions (by ionizing completely). A solution of a strong electrolyte is a good electrical conductor. A non-electrolyte
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is one which provides no ions in the solution (i.e., it doesn’t ionize at all). Therefore a solution of a non-electrolyte doesn’t conduct electricity. A weak electrolyte is one that provides very few ions in solution, by ionizing weakly. A weak electrolyte is a weak electrical conductor. Silver chloride, as an option, created a lot of controversy in this exam. Since it is a salt, what little of it
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This note was uploaded on 07/17/2010 for the course 160 162 taught by Professor Kimmel during the Spring '10 term at Rutgers.

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Chapter 4A TAVSS - CHEM 161-2007 A MOLE IN AQUEOUS...

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