Nov 6, 2009

Electrochemistry

Electrochemistry: Branch of chemistry in which chemical energy is converted into electrical energy or electrical energy is converted into chemical energy is called electrochemistry.
Cell: A vessel in which reacting substance is contained is called Cell.
Electrodes: The plates through which the electric current enter or leave the cell are called electrodes.
Oxidation: The process in which electrons are lost.
Reduction: The process in which electrons are absorbed.
Conductors: Substances through which electricity can pass are called conductors.
Non-Conductors: Substances through which electricity cannot pass are called non-conductors or insulators.
Passage of electricity through solid substances: Figure 8.2 from the book. With the help of this circuit we can find whether a solid is conductor or not. If the bulb is lighted, it’s conductor, otherwise not.
Passage of electricity through liquids: If the electricity is passed through liquid after the circuit is completed, the bulb will be lighted, otherwise not.
Electrolysis: The decomposition of ionic compounds or their solutions due to electricity is called electrolysis. The substance that is electrolyzed is called electrolyte. The substance which cannot be electrolyzed is called non-electrolyte.
Anode: The positive electrodes through which electrons enter the circuit.
Cathode: The negative electrode through which electrons leave the circuit.

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