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Chem energy of electrons 6 & 7

Terms in this set (14)

what are different types of electrochemical cells
Galvanic Cell- a device the converts the energy from a spontaneous chemical reaction into electrical energy.
batteries are galvanic cells
Electrolytic Cell- a device that converts electrical energy into chemical energy
what id an oxidation reduction reaction
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron
what occurs at a anode
here oxidation occurs and is the positive polarity contact in an electrolytic cells
what occurs at a cathode
reduction occurs, gain of electrons
anode
negative electron
cathode
postive electron
battery parts
cathode- Mno2
anode Zn/KOH
Steel case
brass rod
what is a fuel cell
H2 (g) + ½ O2 (g) H2O (g) ΔH = -249 kJ

Could burn hydrogen gas similar to gasoline, but:
difficult to control reaction
inefficient
what is a reformer
processing technique by which the molecular structure of a hydrocarbon is rearranged to alter its properties.
what are solar cells made from
Solar cells can be classified into first, second and third generation cells. The first generation cells—also called conventional, traditional or wafer-based cells—are made of crystalline silicon, the commercially predominant PV technology, that includes materials such as polysilicon and monocrystalline silicon.
what is a semiconductor
crystalline or amorphous solids with distinct electrical characteristics.[1] They are of high resistance - higher than typical resistance materials, but still of much lower resistance than insulators.
what is a conductor
A conductor is a material that allows electric charge to move through it as an electric current. Usually the charge is carried by electrons, and the conductor is a metal.
what is doping
(semiconductor) In semiconductor production, doping intentionally introduces impurities into an extremely pure intrinsic semiconductor for the purpose of modulating its electrical properties.
what is a solar cell and its process
solar cell is a solid-state electrical device (p-n junction) that converts the energy of light directly into electricity (DC) using the photovoltaic effect. The process of conversion first requires a material which absorbs the solar energy (photon), and then raises an electron to a higher energy state, and then the flow of this high-energy electron to an external circuit. Silicon is one such material that uses such process
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