Chemistry with problem solving worksheet 1 Answer key PDF

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Dr. Joel Tolman...

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JOHNS HOPKINS UNIVERSITY Department of Chemistry Chemistry Chemistry with with Problem Problem SolvingSolving- II II Worksheet 1 – Answer Key Electrochemistry 1. Balance the following reactions in an acidic medium.

1. Reaction of arsenic trioxide with nitrate ion 3 As 2O3 (s) + 4 NO3- (aq) + 4 H +(aq) + 7 H 2O(l)

2. Reaction of iodide with hypochlorite 3 I - (aq) + ClO- (aq) + 2H+ (aq)

6 H 3 AsO4(aq) + 4 NO (g)

I 3- (aq) + Cl- (aq) + H 2O (l)

3. Reaction of copper with nitrate to give nitric oxide and copper(II) ions 3 Cu 2+ (aq) + 2 NO (g) + 4 H 2O(l) 3 Cu(s) + 2 NO 3- (aq) + 8 H +(aq) 4. Formation of lead sulfate from the reaction of lead with lead oxide in acid Pb (s) + PbO 2 (s) + 2 H 2SO4 (aq) 2 PbSO 4 (s) + 2 H 2O (l)

2. Balance the following reactions in a basic medium.

1. Decomposition of chlorine gas to give chloride and hypochlorite ions 2 OH- (aq) + Cl 2 (g) Cl - (aq) + OCl- (g) + H 2O (l) 2. Reaction of nitrite with aluminum to form ammonia NO 2- (aq) + 2 Al (s) + H 2O(l) + OH- (aq) NH 3 (g) + 2 AlO2- (aq) 3. Formation of chromium(III) hydroxide from solid chromium Cr(s) + CrO 42- (aq) + 4 H 2O(l) 2 Cr(OH)3 (s) + 2OH - (aq) 4. Reaction of permanganate with sulfide 2 MnO 4- (aq) + 7S2- (aq) + 8 H 2O (l)

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2 MnS (s) + 5 S(s) + 16 OH - (aq)

Rev 01/2016 ST...