Chem Exam 2

xam 2

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Summer 2011

Chemistry 1411

EXAM # 2

Activity Series of Metals in Aqueous Solution
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CHEM 1411 Exam # 2A Name:________________________________

(Chapters 4,5,6, and 7) Score: [pic]

Part I- ( 3 points each) - Please write your correct answer next to each question number, DO NOT CIRCLE.
____ 1. Compare the rates of effusion of CO2 & SO2, rCO2/rSO2

A. CO2 will effuse 1.45 times faster B. CO2 will effuse 1.21 times faster C. SO2 will effuse 1.45 times faster D. SO2 will effuse 2.12 times faster

____ 2. Consider the following redox reaction: 4NH3 + 5O2(4NO + 6H2O Which of the following statements is correct?

A. N is reduced, NH3 is oxidizing agent B. O is oxidized, O2 is reducing agent C. N is reduced, O is oxidized D. N is oxidized, O2 is oxidizing agent

____ 3. If 145 g of KNO3 were added to water to make 1,500 mL of solution, what would be the molarity of the resulting solution?

A. 0.956 M B. 1.43 M C. 0.0967 M D. 10.3 M

____ 4. Calculate the molarity of the solution formed by diluting 50.0 mL of 0.436 M NH4NO3 to 250.0 mL.

A. 21.8 M B. 0.459 M C. 0.0872 M D. 11.5 M

_____5. Which of the following compounds is a weak electrolyte?

A. NH4Cl B. HF C. HCl D. KOH

_____6. What is the chemical formula of the salt produced by the neutralization of nitric acid with Barium hydroxide?

A. BaNO3 B. Ba2NO4 C. Ba2NO3 D. Ba(NO3)2

_____7. What is the oxidation number of N in NaNO2?

A. -1 B. 3 C. -3 D. 4

_____8. Iron is more active than silver but less active than zinc. Which one of the following reactions will occur?

A. Fe + 2Ag+ ( Fe+2 + 2Ag B. Fe + Zn+2(Fe+2 + Zn C. 3Ag + Fe+3( 3Ag+ + Fe D. Zn+2 + 2Ag( Zn + 2Ag+

_____9. Based on the solubility rules, which of the following is insoluble?

A. CuSO4 B. CuS C. CuCl2