Galvanic Cell Reaction – General Chemistry

Galvanic Cell Reaction – Chemistry

This quiz is about Galvanic Cell Reaction – General Chemistry.


Consider the galvanic cell:

Na(s)|Na+(aq)||Al3+(aq)|Al(s)

The total number of electrons transferred in this cell is ____ and _______ is the anode.

3, Na(s)


What is the oxidation state of the chromium atom in each of the following compounds:

HCr2O7CrPO4

+6, +3


Which of the following will increase the rate of the reaction between two gases?

Increasing temperature.


Nickel metal (58.7 g/mol) is often purified using the process of electrolysis. How much nickel metalcould be produced from nickel(II) sulfide solution if you apply a current of 10.0 amps for a total of 12.0 hours? 

131 g


Which of the following statements is true?

If a spontaneous reactions is not observed under certain conditions this reaction must have a high activation energy under these conditions.


The galvanic cell shown in the image below operates via the following chemical reaction:

Co2+(aq) + Mn(s) → Mn2+(aq) + Co(s)

In this cell, oxidation is happening in the beaker containing ___________ and the electrons in the wire are moving ____________________.

Oxidation Reaction

Mn solution, from Mn electrode to Co electrode


In the reaction progress graph shown below, letter ______ represents an intermediate and arrow _____ marks the activation energy for the reaction.

Activation Energy

Y, B


You want to create a galvanic cell with the highest value of Eo using two of the following three half-reactions. To create this cell, the anode should be made of _______ and the cathode should be made of _______. 

Galvanic Cell Half Reactions

Ti(s),  Cu(s)


Identify the catalyst in the following reaction mechanism?

       Step 1                         AB2 + C → AC + B2

       Step 2                         AB2 + AC → 2AB + C       

Overall reaction       2AB2→ 2AB + B2

C


Consider the following list:

H,  H+,  O,  O2-

Which species from the list cannot act as an oxidizing agent?

O2-


Is the following reaction spontaneous at 298K?

Sn(s) + Pb2+(aq) → Sn2+(aq) + Pb(s)

Spontaneous Reaction

No, because Eo = -0.28 V


What species is being oxidized in the following reaction?

2HBrO(aq) + O2(g) → 2HBrO2(aq)

Bromine in HBrO


Which of the following reactions is/are a redox reaction(s)? 

I. HF(aq) + NaOH(aq NaF(aq) + H2O(l)

 II. HClO(aq) + HClO3(aq 2HClO2(aq)      

 III. H2CO3(aq H2O(l) + CO2(g)

II only


You study the reaction A + 2B → 3C in the laboratory. You notice that when you double the initial amount of A the rate of your reaction does not change. When you use half of the initial amount of B in the experiment the initial rate goes down four-fold. Based on these observations, which of the following is a plausible rate law for this reaction? 

Rate = k[B]2


If for a reaction at 300K the rate of the reaction is 4.53 kg/h and at 450K the rate of the reaction is 74.5 kg/h, what is the activation energy for this reaction?

21.0 kJ/mol


If the differential rate law for a reaction is Rate = k[Xe] and the plot below represents the integrated law plot for this reaction, what are the correct units for the axes in the plot?

Rate Law Plot

ln[Xe] V time


The rate of the following reaction in aqueous solution was measured by recording the amount of Hg2Cl2 that precipitated from solution per liter of solution per minute and recorded in the table below.

HgCl2(aq)+ H2C2O4(aq) → 2HCl(aq) + 2CO2(g) + Hg2Cl2(s)

Rate Law Data. Galvanic Cell Reaction - General Chemistry

What is the experimental Rate law predicted by this data?

Rate = k[HgCl2]2[H2C2O4]


The following mechanism was proposed for the reaction:

CH4(g) + Cl2(g) → CH3Cl (g) + HCl(g)

Step 1    Cl2 → 2Cl                        (fast)

Step 2    CH4 + Cl → CH3 + HCl   (slow)

Step 3    CH3 + Cl → CH3              (fast)

Use the proposed mechanism to predict a possible rate law for this reaction.

Rate = k[CH4] [Cl2]1/2


What is the correct line notation for a galvanic cell composed of Mg(s) and Zn(s) electrodes and 1.0M aqueous solutions of magnesium chloride and zinc sulfide.

Galvanic Cell Half Reactions

Mg, Mg2+ || Zn2+, Zn


The following graph was produced by a student in a kinetic experiment.

Graph. Galvanic Cell Reaction - General Chemistry

What is the average rate in the first 10 seconds and what is the half-life for this experiment? 

0.3 M/s and 15 s


Which particle is missing in the following nuclear reaction:

30Si → 30P + _____

electron


You plan to create an electrochemical cell that combines the two half-reactions written in the table below. What would be the standard cell potential for this cell at 298K?

Two Half Reactions

+1.56 V


The oxidation of methane, as described by the equation below, has a ΔG = -713 kJ/mol under certain conditions. What is the cell potential for a methane fuel cell under these conditions?

CH4 + 2O2 → CO2 + 2H2O

0.924 V


What is the total number of electrons that are transferred in the following reaction?

___PH4(g) + ___O2(g) → ___P2O3(s) + ___H2O(l)

14


Consider the following reactions:

3CH4(g) → C3H8(g) + 2H2(g)

If the rate of production of hydrogen is 35 atm/min, what is the rate of consumption of methane?

53 atm/min


Which of the following species is the best reducing agent?

Half Reaction

Ni


A(n) ___________ agent is one that loses electrons. A(n)_____________ agent is one that undergoes oxidation. 

reducing, reducing


The value of Eo for the following reaction is 1.10 V. What is the value of Ecell at 298K when the concentration of Cu2+ is 1.0M and the concentration of Zn2+ is 0.013M

Zn(s) + Cu2+(aq) → Cu(s) + Zn2+(aq)

1.16 V


Consider the galvanic cell:

Zn(s)|Zn2+(aq)||Cu2+(aq)|Cu(s)

If you increase the concentration of Zn solution in this cell _______________. 

you will not change the value of Eo but will decrease the value of Ecell


Radioactive decay follows first order kinetics. If the half-life of a radioactive metal is reported to be 21 day and the radioactivity of a sample of this metal is currently measured to be 0.467 nCi, what would the radioactivity of the sample be after 84 days? The Curie (Ci) is a unit of radioactivity; one can use radioactivity in place of concentration. 

0.0292 nCi


If the rate law for a reaction is Rate = k[H2][F2] and the reaction rate is measured in mol/L-h what are the units for the rate constant? 

L/mol-h


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