Chem 161-2010 some chapter 4 practice problems

Chem 161-2010 some chapter 4 practice problems - CHAPTER 4...

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CHAPTER 4 PRACTICE PROBLEMS DR. ED TAVSS 1
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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. 2
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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. Precipitation reactions 27 Chem 161-2006 Final Exam Chapter 4 – Chemical Reactions in Aqueous Solutions Precipitation reactions Which of the following pairs of solutions would produce a precipitate when equal volumes are mixed? A. BaCl 2 (aq) and KNO 3 (aq) B . AgNO 3 (aq) and NaCl(aq) C. Pb(NO 3 ) 2 (aq) and NaClO 4 (aq) D. NaOH(aq) and HCl(aq) E. (NH 4 ) 2 CO 3 (aq) and K 2 SO 4 (aq) A. BaCl 2 (aq) and KNO 3 (aq) → Ba 2+ (aq) + NO 3 - (aq) + 2K + (aq) + 2Cl - (aq) B. AgNO 3 (aq) and NaCl(aq) → AgCl(s) + Na + (aq) + NO 3 - (aq) C. Pb(NO 3 ) 2 (aq) and NaClO 4 (aq) → Pb 2+ (aq) + 2ClO 4 - (aq) + 2Na + (aq) + 2NO 3 - (aq) D. NaOH(aq) and HCl(aq) → Na + (aq) + Cl - (aq) + H 2 O E. (NH 4 ) 2 CO 3 (aq) and K 2 SO 4 (aq) → 2NH 4 + (aq) + SO 4 2- (aq) + 2K + (aq) + CO 3 2- (aq) B 3
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CHEM 161-2006 EXAM II TYPES OF CHEMICAL REACTIONS AND SOLUTION STOICHIOMETRY PRECIPITATION REACTIONS 23. When aqueous solutions of sodium hydroxide and hydrochloric acid are mixed, what is the net ionic equation for the resultant reaction? (a) H + (aq) + OH - (aq) H 2 O( ) (b) HCl(aq) + NaOH(aq) NaCl(aq) + H 2 O( ) (c) HCl(aq) + NaOH(aq) HClO(aq) + NaH(aq) (d) HCl(aq) + OH - (aq) Cl - (aq) + H 2 O( ) (e) Na + (aq) + Cl - (aq) NaCl(s) Molecular equation: NaOH + HCl → H 2 O + NaCl Ionic equation: Na + + OH - + H + + Cl
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This document was uploaded on 11/02/2011 for the course GEN CHEM 162 at Rutgers.

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Chem 161-2010 some chapter 4 practice problems - CHAPTER 4...

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