Chem 177 Spring 2011 exam 2 answers

Chem 177 Spring 2011 exam 2 answers - Chem 177-S11 Exam 2...

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Chem 177-S11 Exam 2 page 3 total points this page_______ Question 1: (3 pts) A strong electrolyte is one that _______________ completely in solution. Answer: dissociates, or ionizes Question 2: (3 pts) A weak electrolyte exists predominantly as ____________________ in solution. Answer: molecules Question 3: (3 pts) Write the net ionic equation for the reaction between aqueous hydrochloric acid and aqueous sodium hydroxide. Answer: 2 H (aq) OH (aq) H O (l) + - + Question 4: (3 pts) What are the spectator ions in the reaction between 3 KOH (aq) and HNO (aq)? Answer: 3 K and NO + - Question 5: (6 pts) A compound was found to be soluble in water. It was also found that addition of acid to an aqueous solution of this compound resulted in the formation of carbon dioxide. Which one of the following cations would form a precipitate when added to an aqueous solution of this compound? A) 4 NH + B) K + C) 3 Cr + D) Rb + E) Na + Answer: C Question 6: (3 pts) In which species does sulfur have the highest oxidation number? A) 8 S (elemental form of sulfur) B) 2 H S C) 2 SO D) 2 3 H SO E) 2 4 K SO Answer: E
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Chem 177-S11 Exam 2 page 4 total points this page_______ Question 7: (3 pts) Calcium oxide reacts with water in a combination reaction to produce calcium hydroxide: 2 2 CaO (s) H O (l) Ca(OH) (s) + In a particular experiment, a 5.00-g sample of CaO reacts with excess water and 6.11 g of 2 Ca(OH) is recovered. What is the percent yield in this experiment? A) 122 B) 1.22 C) 7.19 D) 92.5 E) 81.9 Answer: D Question 8: (18 pts) Balance the following chemical equations and classify the reactions as either: acid-base, redox, precipitation, gas forming, displacement, or combustion reactions. 3
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This note was uploaded on 09/09/2011 for the course CHEM 177 taught by Professor Greenbowe during the Spring '06 term at Iowa State.

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Chem 177 Spring 2011 exam 2 answers - Chem 177-S11 Exam 2...

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