Galvanic Cells
Galvanic cells, a cornerstone of electrochemistry, represent a fascinating interplay between chemical reactions and electrical energy. These devices, also known as voltaic cells, harness spontaneous redox reactions to generate electricity through the transfer of electrons between different chemical species. Dating back to the pioneering work of Alessandro Volta in the late 18th century, galvanic cells have found myriad applications in batteries, corrosion prevention, and electroplating, among others. Understanding the principles underlying galvanic cells is essential not only for advancing technological innovations but also for unraveling fundamental concepts in chemistry and physics.
Questions
- How do you calculate the standard cell potential of a cell constructed from #Mg^(2+)#/#Mg# and#Ni^(2+)#/#Ni#. Which half-cell is the anode and which half-cell is the cathode?
- How does a salt bridge improve a battery?
- What is the value of #E_(cell)# at #"25"^oC# after 5.0 hours of operation at 3.0 A...?
- How do you determine the concentrations of reagents in a galvanic cell when the cell "dies"?
- What is an example of a galvanic cell practice problem?
- How does concentration effect an electrochemical cell?
- How does temperature affect voltage in a galvanic cell?
- Why can't we have half-reactions by themselves?
- Galvanic cell run at 25° C: calculate #\DeltaG# when #K=2.79xx10^7#?
- Draw a diagram for this Galvanic cell, labeling the electron flow, the anode and cathode, and the positive and negative sides of the Galvanic cell?
- Help with the following electrochem problems about standard cell potentials?
- I know reduction occurs at the cathode and oxidation occurs at the anode, but why are positive and negative terminals switched when comparing galvanic and electrolytic cells?
- How do electrons flow in a galvanic cell?
- Why do galvanic cells need a salt bridge?
- A voltaic cell is constructed using the following half-reactions. How do you determine the cell reaction?
- Electrodeposition of copper: what mass of copper can be deposited in 1.00 hr by a current of 1.62 A?
- What is the standard EMF of a cell that uses the #"Mg/Mg"^(2+)# and #"Cu/Cu"^(2+)# half-cell reactions at #25^@"C"# ?
- For the cell #"Cd"|"Cd"^(2+), "NO"_3^(-)||"H"^(+), "ClO"_4^(-), "Cl"^(-) | "C"#...?
- Are the reactions in galvanic cells always spontaneous? Why?
- What are some common mistakes students make with galvanic cells?