General Chemistry Answers

A galvanic cell consists of a chromium, Cr bar in a chromic sulfate solution, Cr2(SO4)3 containing 13 g and a silver, Ag bar in a silver sulfate solution (Ag2SO4 ) containing 37.8 g in a

3 L solution and a sodium sulfate solution use as a salt bridge solution. The silver electrode is positive relative to the chromium electrode. Write the cell half- reactions, overall reaction and cell notation. Calculate the following:

A) Gibbs Free – Energy B) Electrode potential of the cell.

(Note: when calculating the molarity do not include the spectator ions)

2. Calculate the electrode potential generated by the cell in the given notation:

Al(s)l Al3+(aq) ll I 2(s) l I – 1(aq) When [Al+3] = 4.0 x 10 -3 M and [I – 1 ] = 0.010 M

. Calculate the concentration of the chromic ion in the cell which has an electrode potential of 0.688 at 298.15 K for the given reaction:

           Cr2O7 2 –(aq) + 14 H+ (aq) + 6 I – 1 (aq)   →    2 Cr 3+(aq) + 3I2(s) + 7 H2O(l)

         When       [Cr2O7 2 – ] = 2.25 M;   [H+] = 1.0 M ; [I – 1 ] = 1.0 M ;  [H2O] = 1.0 x 10 – 5 M

          Calculate the Gibbs free-energy  and the standard Gibbs Free-Energy occur in the system

 Calculate the electrode potential generated by the cell in the given notation:     

      Al(s)l Al3+(aq) ll I 2(s) l I – 1(aq)          When [Al+3] = 4.0 x 10 -3 M and [I – 1 ] = 0.010 M

 L solution and a sodium sulfate solution use as a salt bridge solution. The silver electrode is positive relative to the chromium electrode. Write the cell half- reactions, overall reaction and cell notation. Calculate the following:

A) Gibbs Free – Energy               B) Electrode potential of the cell.

                     (Note: when calculating the molarity do not include the spectator ions)

what is the dependent & independent, and what might be controlled variables in this experiment? -An engineer testing the effect of heat on the lifetime of a cell phone’s battery.

When copper is heated with excess of sulfur, copper 1 sulfide is formed. In a given experiment, 0.0970 moles of copper was heated with excess sulfur to yield 1.43 g copper 1 sulfide. What is the percent yield?

Titanium is a transition metal used in many alloys because it is extremely strong and lightweight. Titanium tetrachloride (TiCl4) is extracted from titanium oxide (TiO2) using chlorine and coke (carbon). What is the mass of Cl2 gas is needed to react with 1.25 mol of TiO2?