This lesson includes 19 additional questions for subscribers.
Lesson Worksheet: Primary Galvanic Cells Chemistry
In this worksheet, we will practice describing primary cells and explain how they produce electrical energy.
Which of the following reactions is the half-equation for the reaction that occurs at the cathode in a mercury cell?
The following diagram is a representation of a hydrogen fuel cell.
Considering the direction of electrons through the top circuit, shown by the red arrow, what gas is introduced through pipe A?
In hydrogen fuel cells, an electrical charge can be generated continuously.
What type of cell would a hydrogen fuel cell be classified as?
- AA voltaic cell
- BAn electrolytic cell
Why does a fuel cell not discharge and run out like disposable cells, such as the mercury cell?
- AThe fuel cells are very efficient to run in most devices.
- BThe water that is produced is broken down and reused.
- CIt has a continuous supply of fuel.
- DThe fuel cell is recharged by the device while it is running.
- EUnreacted hydrogen and oxygen are recycled.
The overall voltage for a mercury cell is found to be V. Consider the following electrode potential:
What must the reduction potential of the other electrode in the cell be? Give your answer to 4 decimal places.
A hydrogen fuel cell under acidic conditions has a standard cell potential of V.
Consider the following half-equation reaction:
Given that the electrode potential of the cathode is also V, what is the electrode potential of the anode where this half-equation reaction takes place?
What is this value of the electrode potential of the anode equivalent to?
- AHalf of the electrode potential of the cathode
- BThe electrode potential of the standard hydrogen electrode
- CThe electrode potential of the cathode
- DThe opposite polarity of the electrode potential of the cathode
- EThe opposite polarity and half the electrode potential of the cathode
The two reduction half-equations for a hydrogen cell under alkaline conditions are as follows:
What is the overall cell potential, , of this hydrogen cell?
A hydrogen fuel cell can operate under certain conditions, but the overall reaction of hydrogen combining with oxygen to form water is the same regardless.
Consider the following equations:
Which of the equations can be paired so that when they are combined they give the overall reaction for a hydrogen fuel cell?
- AAD and BC
- BAC and BD
- CAB and CD
The illustration shows a representation of the inside of a hydrogen fuel cell.
What chemical is used for the central electrolyte?
- APure water
- BHydrogen peroxide
- CDilute sulfuric acid
- DPotassium hydroxide
- EDeionized water
What are the two electrodes used in many hydrogen fuel cells made of?
What waste chemical is emitted at the anode?
A cross section of a mercury button cell is shown in the illustration.
What is the polarity of the anode? What is the material often used for it?
- APositive, steel
- BPositive, graphite
- CPositive, cadmium
- DNegative, zinc
- ENegative, mercury
What chemical can act as an electrolyte in these types of cells and would be found saturated throughout the separator Q?
- AZinc oxide
- BPotassium hydroxide
- CMercury metal
- DMercuric oxide
- EHydrochloric acid
A fuel cell is a primary galvanic cell that is mainly used to produce .