Chapter 4 Problems

Chapter 4 Problems - Chemistry 141 Lecture Dr. Ben Tovrog...

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Chemistry 141 Lecture Dr. Ben Tovrog Chapter 4 Supplemental Problems 1. Assign the oxidation number to each atom in the following elements, molecules and ionic substances: a) CCl 4 b) CH 4 c) HNO 3 d) Ca(NO 3 ) 2 e) K 2 Cr 2 O 7 f) Ag g) I 2 h) Fe 2 O 3 i) CO 2 j) SF 6 k) NH 4 Cl l) O 2 2. Assign the oxidation number to each atom in the following ions: a) Ni 2+ b) CO 3 2- c) MnO 4 - . d) SO 4 2- e) PO 4 3- f) NO 3 - 3. For the following reactions identify if it is or isn’t an oxidation reduction reactions. If it is a redox reaction, identify the oxidizing agent, the reducing agent, the substance being oxidized and the substance being reduced. Identify the oxidation number changes which support those identifications. A) Zn (s) + 2 HCl (aq) ZnCl 2 (aq) + H 2 (g) B) Cr 2 O 7 2- (aq) + 2 OH - 2 CrO 4 2- (aq) + H 2 O (l) C) 3 H 2 (g) + N 2 (g) 2 NH 3 (g) D) Ag + (aq) + Cl - (aq) AgCl (s) E) 3 Cu (s) + 8 H + (aq) + 2 NO 3 - (aq) 3 Cu 2+ (aq) + 2 NO (g) + 4 H 2 O 4. For the following identify the type of reaction, the substance oxidized and the substance reduced. If the reaction is not a redox reaction, indicate as such. A) (NH 4 ) 2 CO 3 (s) 2 NH 3 (g) + H 2 O (l) + CO 2 (g) B) HClO 4(aq) + NaOH (aq) H 2 O (l) + NaClO 4 (aq) C) 2 Cu (s) + O 2 (g) 2 CuO (s) 5. Barium sulfate is a strong electrolyte. If you dissolve 100 g. of barium sulfate in 400 ml of water, what are the concentrations of the ions present in solution? 6.
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This note was uploaded on 07/30/2008 for the course CHEM 141 taught by Professor Mulfod during the Summer '08 term at Emory.

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Chapter 4 Problems - Chemistry 141 Lecture Dr. Ben Tovrog...

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