PExam03 - Name: _ Date: _ 1. The strength of steel is due...

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Name: ___________________________________ Date: ______________ 1. The strength of steel is due to the effect of what substance with the iron? A) copper B) carbon monoxide C) sulfur D) carbon E) zinc 2. Consider the galvanic cell shown below (the contents of each half-cell are written beneath each compartment): 0.50 M Br 2 0.20 M Cr 3+ 0.10 M Br - The standard reduction potentials are as follows: ? ° = -0.730 V ? ° = +1.090 V What is ? ° for this cell? A) 1.820 V B) 0.360 V C) –0.360 V D) 4.730 V E) 1.310 V 3. Within the halogen family, as atomic number increases, A) ionic radius decreases. B) covalent atomic radius increases. C) melting point decreases. D) electronegativity increases. E) none of these Page 1
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4. Order the following bonds from highest to lowest bond energy: carbon–carbon, silicon– silicon, silicon–oxygen. A) C—C, Si—Si, S—O B) Si—O, C—C, Si—Si C) Si—Si, Si—O, C—C D) Si—O, Si—Si, C—C E) C—C, Si—O, Si—Si 5. In which of the following cases can ? ° be equal to zero? A) In any cell at equilibrium. B) In a concentration cell. C) ? ° can never be equal to zero. D) Choices a and b are both correct. E) None of these. Use the following to answer questions 6-7. Reaction ? ° (volts) Na + + e Na –2.71 Al 3+ + 3 e Al –1.66 Zn 2+ + 2 e Zn –0.76 Fe 2+ + 2 e Fe –0.44 Ni 2+ + 2 e Ni –0.23 Sn 2+ + 2 e Sn –0.14 Cu 2+ + 2 e Cu +0.34 Ag + + e Ag +0.80 Cl 2 + 2 e 2Cl +1.36 F 2 + 2 e 2F +2.87 Page 2
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6. Which of the following would be the best oxidizing agent? A) Cl
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This note was uploaded on 11/30/2008 for the course CHEM 104 taught by Professor Quigley during the Spring '08 term at CUNY Hunter.

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PExam03 - Name: _ Date: _ 1. The strength of steel is due...

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