One of the most useful applications of oxidation-reduction reactions is the prod
ID: 553686 • Letter: O
Question
One of the most useful applications of oxidation-reduction reactions is the production of electricity. Batteries are “prepackaged” redox reactions which produce electricity. Consider the redox reaction of aluminum metal reacting with vinegar (acetic acid). 2 Al + 6 HC2H3O2 º 2 Al(C2H3O2 )3 + 3 H2 or 2 Al + 6 H+ º 2 Al3+ + 3 H2 A battery works by physically separating the oxidation and the reduction half reactions.
Why does the cardboard need to be soaked in the vinegar solution?
Look at the reaction. Salt is not part of the reaction, and yet it is added to the vinegar in step 2. What is the purpose of the salt?
One battery consists of a piece of aluminum, a penny, and a piece of soaked cardboard stacked on top of each other, in that order..
Look at the half reactions on the Activity Sheet. The aluminum is oxidized (loses or produces electrons), while simultaneously the hydrogen is reduced (consumes electrons). How many moles of electrons are produced (and consumed) in this balanced reaction?
What is the copper penny used for in the battery?
Why must the cardboard be soaked in the vinegar/salt solution?
How does the number of batteries affect the amount of light emitted?
How many batteries were required to observe light?
What other solutions might be used with this battery? (Choose the best answer)
It makes the cardboard taste better.Explanation / Answer
The cardboard need to be soaked in the vinegar solution as The battery must have an electrolyte to allow the flow of electrons and cations.
The purpose of the salt is The battery must have an electrolyte to allow the flow of electrons and cations.
One battery consists of a piece of aluminum, a penny, and a piece of soaked cardboard stacked on top of each other, in that order..TRUE
The number moles of electrons are produced (and consumed) in this balanced reaction
6 moles of electrons for every 2 moles of Al and 6 moles of electrons for every 3 moles of H2 produced.
Both are correct
The copper penny used for in the battery as The copper serves as the cathode to allow the flow of electrons from the anode.
The cardboard must be soaked in the vinegar/salt solution as it provide the electrolyte solution to enable the battery to operate.
Number of batteries affect the amount of light emitted as More batteries gives more light.
More than 5 batteries were required to observe light
Solutions might be used with this battery Any weak acid that does not react with aluminum or copper
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