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Graphite is used in pencils, as a lubricant, and in electrolytic cells. Abrasives are materials that wear away other substances, which is contrary to graphite's lubricating properties. Thus, 'High-friction material' or 'Abrasive' is not a typical use of graphite.
A Voltaic cell, also known as a galvanic cell, generates electricity through a spontaneous redox reaction. To recharge it, the process must be reversed, which can be achieved by applying an external electric potential. This is done by replacing the external circuit with an external source of electricity, effectively forcing the reaction in the opposite direction to restore the cell's original state.
2544
A lower standard reduction potential indicates a smaller tendency to form what?
In electrochemistry, the standard reduction potential (E°) is a measure of an element's tendency to gain or lose electrons. A lower E° value indicates a smaller tendency to lose electrons, resulting in a smaller tendency to form positive ions.
2545
What type of cell is formed when a highly reactive metal like Aluminum is in contact with a less reactive element like Copper?
When an active metal like Al comes into contact with a less active element like Cu, it forms a galvanic cell due to the potential difference between the two metals, driving a spontaneous redox reaction.
2546
What characteristic is associated with the anode in a Zn-Cu galvanic cell?
In a Zn-Cu galvanic cell, the anode is where oxidation occurs, and it has a negative charge due to the accumulation of electrons released during the oxidation reaction.
2547
In electrolytic cell electricity carries________________?
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2548
Which type of cell does not generate energy spontaneously?
An electrolytic cell requires external energy to drive a reaction, whereas Galvanic and Daniel cells generate energy spontaneously through chemical reactions. This makes the electrolytic cell non-spontaneous.
2549
What is the pressure at which H2 gas is filled in a Standard Hydrogen Electrode (SHE)?
The Standard Hydrogen Electrode is defined at standard conditions, including a pressure of 1 atm, equivalent to 760 mm of Hg. This is a fundamental reference point in electrochemistry, ensuring consistency across measurements.
A salt bridge is a device used in electrochemistry to connect two half-cells in an electrochemical cell, allowing ions to flow between them while maintaining electrical neutrality. Potassium chloride (KCl) is a common chemical used in salt bridges due to its ability to conduct electricity and maintain the electrical neutrality of the system.
