Consider the NiCd (nickle cadmium) cell found in rechargeable batteries.
1.)Which element is the cathode when the cell is recharging (being electrolytic)?
2.)How many cells must be present to produce 1.2 V
3.)Which element is the anode when the cell is discharging (being galvanic)
4.)What is the cell potential when discharging
I believe all of these questions are answered here.
https://en.wikipedia.org/wiki/Nickel%E2%80%93cadmium_battery
Scroll down to the chemical part to get the equations and discussion of charge vs discharge.
Thanks, but I don't know how to solve it. This was a question from my review
What is to solve?
2. is 1.2v and that site said so.
4. is 1.2v and that site all but said so. The words were something like that the cell continued to discharge produce maximum voltage until it was all but completely discharged.
For which is the anode and cathode, find those equations on the site I gave and apply this definition.
The anode is where oxidation occurs and it is + in galvanic. The cathode is - in charging mode.
To answer these questions, let's first understand the structure of a NiCd (Nickel Cadmium) cell.
A NiCd cell consists of two main components: the cathode and the anode. The cathode is the positive electrode, and the anode is the negative electrode. They are separated by an electrolyte, which allows the flow of ions during the charging and discharging processes.
Now, let's address each question step by step:
1.) Which element is the cathode when the cell is recharging (being electrolytic)?
During the recharging process, the cathode in a NiCd cell is nickel hydroxide (Ni(OH)2). When the cell is being electrolytic, cadmium (Cd) present in the anode gets oxidized and converted into cadmium hydroxide (Cd(OH)2), while nickel hydroxide (Ni(OH)2) on the cathode gets reduced.
2.) How many cells must be present to produce 1.2 V?
Each NiCd cell generally produces around 1.2 volts when fully charged. So, to produce a total of 1.2 V, only one cell is required. However, if you need a higher voltage, you can connect multiple cells in series. For example, connecting four NiCd cells in series would result in a total voltage of 4.8 V (4 cells x 1.2 V each).
3.) Which element is the anode when the cell is discharging (being galvanic)?
During the discharging process, the anode in a NiCd cell is cadmium (Cd). Cadmium gets oxidized and releases electrons, which flow through an external circuit to power devices. Meanwhile, nickel hydroxide (Ni(OH)2) on the cathode gets reduced.
4.) What is the cell potential when discharging?
The standard cell potential for a NiCd cell when discharging is typically around 1.2 volts. However, the actual cell potential can vary depending on factors such as the state of charge, temperature, and overall cell condition. It's important to note that cell potential may decrease as the cell discharges and its chemical reactions proceed.
Remember that while these are general explanations for NiCd cells, specific details and variations may exist depending on the exact design and composition of a particular NiCd battery.