Electronegativity Prac exam

Electronegativity Prac exam - Unit 19 Study Guide 1...

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Unit 19 Study Guide 1. Ammonium metavandate reacts with sulfur dioxide in acidic solution as follows (hydrogen ions and H 2 O omitted): x VO 3 + y SO 2 x VO 2+ + y SO 4 2– The ratio x : y is: A) 1 : 1 B) 1 : 2 C) 2 : 1 D) 1 : 3 E) 3 : 1 2. The following reaction occurs in basic solution: F 2 + H 2 O O 2 + F When the equation is balanced, the sum of the coefficients is: A) 10 B) 11 C) 12 D) 13 E) none of these 3. When the equation for the following reaction in basic solution is balanced, what is the sum of the coefficients? MnO 2 + HO 2 MnO 4 A) 11 B) 31 C) 14 D) 9 E) 18 4. The reaction below occurs in basic solution. In the balanced equation, what is the sum of the coefficients? Zn + NO 3 Zn(OH) 4 2– + NH 3 A) 12 B) 15 C) 19 D) 23 E) 27 5. What is the oxidation state of Hg in Hg 2 Cl 2 ? A) +2 B) –1 C) –2 D) +1 E) 0 6. How many electrons are transferred in the following reaction? 2ClO 3 + 12H + + 10I 5I 2 + Cl 2 + 6H 2 O A) 12 B) 5 C) 2 D) 30 E) 10 7. Which energy conversion shown below takes place in a galvanic cell? A) electrical to chemical B) chemical to electrical C) mechanical to chemical D) chemical to mechanical E) mechanical to electrical 8. Which of the following reactions is possible at the anode of a galvanic cell? A) Zn Zn 2+ + 2e B) Zn 2+ + 2e Zn C) Zn 2+ + Cu Zn + Cu 2+ D) Zn + Cu 2+ Zn 2+ + Cu E) two of these 9. How many electrons are transferred in the following reaction? Fe + 2HCl FeCl 2 + H 2 A) 0 B) 1 C) 2 D) 4 E) not enough information given 10. Which of the following is true for the cell shown here? Zn(s) Zn 2+ (aq)  Cr 3+ (aq) Cr(s) A) The electrons flow from the cathode to the anode. B) The electrons flow from the zinc to the chromium. C) The electrons flow from the chromium to the zinc. D) The chromium is oxidized. E) The zinc is reduced. 11. How many electrons are transferred in the following reaction? SO 3 2– (aq) + MnO 4 (aq) SO 4 2– (aq) + Mn 2+ (aq) A) 6 B) 2 C) 10 D) 4 E) 3 Page 1
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12. A strip of copper is placed in a 1 M solution of copper nitrate and a strip of silver is placed in a 1 M solution of silver nitrate. The two metal strips are connected to a voltmeter by wires and a salt bridge connects the solutions. The following standard reduction potentials apply: Ag + (aq) + e Ag(s) E ° = +0.80 V Cu 2+ (aq) + 2e Cu(s) E ° = +0.80 V A) Electrons flow in the external circuit from the copper electrode to the silver electrode. B) The silver electrode increases in mass as the cell operates. C) There is a net general movement of silver ions through the salt bridge to the copper half-cell. D) Negative ions pass through the salt bridge from the silver half-cell to the copper half-cell. E)
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Electronegativity Prac exam - Unit 19 Study Guide 1...

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