2009Fchem125exam2--122rs040ri66

2009Fchem125exam2--122rs040ri66 - Chem. 125 Exam #2 Fall...

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Chem. 125 Exam #2 Fall 2009 PART A. (4 Points each) 1. What is the value of a 0.50 in 3 of gold, if a troy ounce is worth $1,000.00? Useful information: density of Au = 19.3 g/cm 3 ; 1 troy ounce (t oz) = 31.1 g; 2.54 cm = 1 in. a. <$1,000 b. Between $1,000 and $2,000 c. Between $2,000 and $4,000 d. Between $4,000 and $5,000 e. >$5,000 2. Which of the following ionic compounds is soluble in water? a. MgCO 3 b. Iron (II) phosphate c. Iron (III) sulfide d. HgI e. KOH 3. What precipitate is formed when a solution of silver acetate is mixed with a solution of zinc iodide? a. There is no precipitate b. ICH 3 COO c. ZnAg d. AgI e. Zn(CH 3 COO) 2 4. 3.50 g ammonium sulfide, (NH 4 ) 2 S, is dissolved in enough water to make 500. mL of solution. What is the concentration of the ammonium ions? a. 0.102 M b. 0.205 M c. 0.051 M d. 0.306 M e. > 1.0 M
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Chem. 125 Exam #2 Fall 2009 5. The stockroom has 0.650 M H 2 SO 4 . How many milliliters of this acid are required to prepare 250. mL of 0.0425 M sulfuric acid? a. 16.3 mL b. 65.4 mL c. 42.0 mL d. 27.3 mL e. 3.82 mL 6. Approximately how many potassium ions are in 20 mL of 0.44 M potassium phosphate, K 3 PO 4 ? a. 2 x 10 22 b. 5 x 10 21 c. 8 x 10 23 d. 3 x 10 23 e. 50 7. What is the concentration of nitric acid if excess zinc powder is added to75.0 mL of the acid to produce 0.13 moles of hydrogen gas? ( 29 ( 29 ( 29 ( 29 ( 29
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This note was uploaded on 02/04/2011 for the course CHEM 125 taught by Professor Ellis during the Spring '07 term at NJIT.

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2009Fchem125exam2--122rs040ri66 - Chem. 125 Exam #2 Fall...

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