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cathode    音标拼音: [k'æθ,od]
n. 阴极

阴极

cathode
阴极

cathode
n 1: a negatively charged electrode that is the source of
electrons entering an electrical device [ant: {anode}]
2: the positively charged terminal of a voltaic cell or storage
battery that supplies current [ant: {anode}]


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  • Positive or Negative Anode Cathode in Electrolytic Galvanic Cell
    66 In a galvanic (voltaic) cell, the anode is considered negative and the cathode is considered positive This seems reasonable as the anode is the source of electrons and cathode is where the electrons flow However, in an electrolytic cell, the anode is taken to be positive while the cathode is now negative
  • Which is anode and which is cathode? - Chemistry Stack Exchange
    The cathode is the electrode, where substances are gaining electrons and are reduced The tricky part for the memorising is, anodes and cathodes flip the position, when the current is reversed, depending on if the cell is in the mode of electrolysis the cell is in the mode of providing current
  • physical chemistry - How to correctly define anode and cathode . . .
    In a cathode ray tube experiment, the CRT would be the area of interest and electrons are ejected from the cathode into the tube and are incident on the glass behind the anode The statement that cathode is the electrode where reduction takes place is slightly misleading This is because oxidation and reduction take place simultaneously (have to)
  • Half cells: difference between E (cell) = E (cathode}-E (anode) E . . .
    The cathode is actually the reduction step, and the anode is the oxidation step A useful mnemonic I learned from my chemistry professor is a red cat and an ox Interestingly, cathodes in electrochemical cells are red and are positive So I have found many uses for this along the way
  • electrons - How did J. J. Thomson prove that the cathode rays were made . . .
    Cathode "rays" had been known for some time before Thomson They were first observed as experiments in gas discharge tubes started to exploit better and better vacuums (the early experiments observed the varying forms of discharge in low pressure gases; cathode rays only become significant when there is very little gas left in the tubes)
  • How are cathode rays produced? - Chemistry Stack Exchange
    Why cathode rays are produced if pressure of the gas discharge tube is lowered to about $10^{-4}$ atm? How bombardment of glass of gas discharge tube from cathode ray result in a faint glow?
  • What is the flow of electrons, cations, and anions in a voltaic cell . . .
    According to my notes and many sources on the internet, electrons and cations both travel from the anode (A in the image) to the cathode (B in the image) The idea of the salt bridge is to prevent electrolytes mixing while providing ion flow When you have a high concentration of inert ions in the salt bridge, cations in the salt bridge will flow into B, and anions in the salt bridge will flow
  • Why is the electrode potential for a cathode positive?
    The cathode always accepts electrons (reduction) The postive electrode is the one with the higher potential than the negative electrode Since the potentials are all defined relative to a theoretical standard electrode (see Poutnik's answer), this designation may or may not match the actual sign of the potential
  • Why is the anode in a galvanic cell negative, rather than positive . . .
    Similarly in diagrams comparing galvanic and electrolytic cells, electrons move away from the anode to the cathode in the electrolytic cell, making the anode positive This makes perfect sense according to my first reasoning However, in a galvanic cell, even though electrons still move from the anode to the cathode, it is defined as negative
  • Why do positive ions go to the cathode? - Chemistry Stack Exchange
    A very broad definition of a cathode is that it is the electrode of some device connected to the negative pole of the current source For electrolysis it is commonly believed that the “−” cathode is the electrode on which the reduction process takes place, and the “+” anode is the one where the oxidation process takes place





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