EIpractice

# EIpractice - 1 Balance the following equation in an acidic...

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1) Balance the following equation in an acidic solution: CH 3 OH(aq) + Ce 4+ (aq) CO 2 (aq) + Ce 3+ 2) Balance the following equation in a basic solution: H 2 CO(aq) + Ag(NH 3 ) 2 + (aq) HCO 3 - (aq) + Ag(s) + NH 3 (aq) 3) Why is a salt bridge or porous disk necessary for the flow of electrons in a galvanic cell? 4) For the following unbalanced equation: Cu 2+ (aq) + Mg(s) ? Mg 2+ + Cu(s) Draw a spontaneous galvanic cell labeling the anode, cathode, electron flow direction, + and – signs, electrodes, and solutions. Assume the concentrations are 1M and T=298K. In addition, write the balanced equation, cell diagram, overall cell potential, equilibrium constant, ?G°, and specify how many electrons are transferred. 5) For the cell below, identify the anode, cathode, path of electron flow, write the balanced equation, and give the cell potential with respect to your overall balanced equation. 6) Why does a catalyst increase the rate of a chemical reaction? 7) H 2 and O 2 react explosively to form water, but a mixture of the two can be stable in a balloon. Why don’t they react under normal conditions? [Ag + ]= 1M [Ag + ]= 0.01M Ag

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8) Given the following reaction: 2I - (aq) + S 2 O 8 2- (aq) I 2 (aq) + 2SO 4 2- (aq) The following experimental data was obtained: [I - ] [S 2 O 8 2- ] Rate 0.080 0.040 12.5x10 -6 0.040 0.040 6.25x10 -6 0.080 0.020 6.25x10 -6 0.032 0.040 5.00x10 -6 0.060 0.030 7.00x10 -6 The rate is defined as the disappearance of S 2 O 8 2- (aq). Determine the rate law and calculate a rate constant for each experiment and determine the average rate constant. 9) A certain 1 st order reaction is 45% complete in 65 seconds. What are the rate constant and ½ life for this process? 10) The activation energy for the reaction: NO 2 (g) + CO(g) NO(g) + CO 2 (g) is 125 kJ/mol, and ?E is -216 kJ/mol. What is the activation energy for the reverse reaction?
2. Given: Cr(OH) 3 (s) ' CrO 4 2— (aq), basic solution. How many electrons appear in the balanced half-reaction? __ A. 3 __ B. 6 __ C. 4 __ D. 5 __ E. 7 3. For the cell diagram Pt|H 2 (g)|H + (aq) ~ Fe 3+ (aq),Fe 2+ (aq)|Pt which reaction occurs at the anode? __ A. 2H + (aq) + 2e ' H 2 (g) __ B. Fe 2+ (aq) ' Fe 3+ (aq) + e __ C. 2Fe 3+ (aq) + H 2 (g) ' 2Fe 2+ (aq) + 2H + (aq) __ D. Fe 3+ (aq) + e ' Fe 2+ (aq) __ E. H 2 (g) ' 2H + (aq) + 2e 4. Write the cell diagram for the reaction Cl 2 (g) + 2Br (aq) ' 2Cl (aq) + Br 2 (l) __ A. Pt|Br 2 (l)|Br (aq) ~ Cl (aq)|Cl 2 (g)|Pt __ B. Pt|Cl 2 (g)|Br (aq) ~ Cl (aq)|Br 2 (l)|Pt __ C. Pt|Cl

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EIpractice - 1 Balance the following equation in an acidic...

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