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Topic: Voltaic cell

	Galvanic cell - Wikipedia, the free encyclopedia
		The Voltaic pile, invented by Alessandro Volta in the 1800s, is a similar concept.
		The Galvanic cell's metals dissolve in the electrolyte at two different rates, leaving some electrons in the rest of the metal, which charges it negative with respect to the electrolyte.
		Unwanted galvanic cells are formed whenever two metals are in contact in the presence of an electrolyte, such as salt water, resulting in the galvanic corrosion of the more active metal.
	en.wikipedia.org /wiki/Galvanic_cell (0 words)

	Chapter 20, Section 7 (Site not responding. Last check: 2007-10-09)
		Voltaic cells are widely used as convenient energy sources whose primary virtue is portability.
		When the cells are connected in series (with the positive terminal of one attached to the negative terminal of another), the battery produces an emf that is the sum of the emfs of the individual cells.
		The electrodes are composed of hollow tubes of porous, compressed carbon impregnated with a catalyst; the electrolyte is KOH.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter20/medialib/blb2007.html (0 words)

	Electrochemical Cells
		In order for the voltaic cell to continue to produce an external electric current, there must be a movement of the sulfate ions in solution from the right to the left to balance the electron flow in the external circuit.
		The energy yield from a voltaic cell is given by the cell voltage times the number of moles of electrons transferred times the Faraday constant.
		voltaic cell in 1836 which used zinc and copper and solutions of their ions.
	www.angelfire.com /ab6/userper/electrochem.htm (0 words)

	Voltaic Cells (Site not responding. Last check: 2007-10-09)
		Voltaic (Galvanic) Cells consist of two separate compartments called "half cells" containing electrolyte solutions and electrodes that can be connected in a circuit to some voltmeter placed between the two electrodes within the circuit.
		The two half cells are connected by a salt bridge and a voltmeter is placed in the external circuit of the voltaic cell.
		The pH meter that indicates the pH of a substance is a voltaic cell that produces millivolt output related to the Hydrogen ion concentration.
	members.aol.com /logan20/voltaic.html (0 words)

	Standard Electrode Potentials
		The cell potential (often called the electromotive force or emf) has a contribution from the anode which is a measure of its ability to lose electrons - it will be called its "oxidation potential".
		When an electrochemical cell is arranged with the two half-reactions separated but connected by an electrically conducting path, a voltaic cell is created.
		The cell potential for a voltaic cell under standard conditions can be calculated from the standard electrode potentials.
	hyperphysics.phy-astr.gsu.edu /hbase/chemical/electrode.html (0 words)

	PIRA 5E40.00 CELLS AND BATTERIES (Site not responding. Last check: 2007-10-09)
		A voltaic cell is made with copper and zinc electrodes in a sulfuric acid solution.
		Short a few voltaic cells in series through a loop of iron or nichrome wire.
		The elementary lead storage cell is charged and discharged on the lecture table.
	www.physics.ncsu.edu /pira/5eandm/5E40.html (0 words)

	Electrochemical Cells
		Energy is required to force the electrons to move from the zinc to the copper electrode, and the amount of energy per unit charge available from the voltaic cell is called the electromotive force (emf) of the cell.
		For the zinc/copper cell under the standard conditions, the calculated cell potential is 1.1 volts.
		English chemist John Frederick Daniell developed a voltaic cell in 1836 which used zinc and copper and solutions of their ions.
	hyperphysics.phy-astr.gsu.edu /hbase/chemical/electrochem.html (0 words)

	Electrochemical Reactions (Site not responding. Last check: 2007-10-09)
		Electrochemical cells that use an oxidation-reduction reaction to generate an electric current are known as galvanic or voltaic cells.
		The potential of a voltaic cell depends on the concentrations of any species present in solution, the partial pressures of any gases involved in the reaction, and the temperature at which the reaction is run.
		The Zn/Zn half-cell is therefore the anode, and the Cu /Cu half-cell is the cathode, as shown in the figure of the Daniell cell.
	chemed.chem.purdue.edu /genchem/topicreview/bp/ch20/electro.html (0 words)

	MSN Encarta - Multimedia - Voltaic Cell: A Chemical Battery
		A voltaic cell harnesses the electrical work of a spontaneous chemical reaction to power a lightbulb.
		The zinc and copper strips act as electrodes, and the salt bridge (in this case potassium chloride) allows electrons to flow between the beakers without allowing the solutions to mix.
		The copper strip is built-up as additional electrons react with the copper sulfate solution to produce additional metal (reduction).
	encarta.msn.com /media_461531641/Voltaic_Cell_A_Chemical_Battery.html (0 words)

	Batteries (Site not responding. Last check: 2007-10-09)
		The chemical cell generates electricity by a reaction that allows for the transfer of electrons from one charged atom to another.
		A voltaic cell is a chemical cell that is self-driven.
		Volta, after whom the volt was named, stacked as many as 60 pairs of discs to increase the total voltage.
	www.formulasun.org /education/batteries.html (0 words)

	Chapter 20, Section 4 (Site not responding. Last check: 2007-10-09)
		The emf of a particular voltaic cell depends on the specific reactions that occur at the cathode and anode, the concentrations of reactants and products, and the temperature, which we will assume to be 25°C unless otherwise noted.
		The cell potential is the difference between two electrode potentials, one associated with the cathode and the other associated with the anode.
		A voltaic cell is based on a Co /Co half-cell and a AgCl/Ag half-cell.
	cwx.prenhall.com /bookbind/pubbooks/blb/chapter20/medialib/blb2004.html (0 words)

	Voltaic Cells
		This voltaic cell has copper metal and copper sulfate solution in the left hand beaker; zinc metal and zinc sulfate in the right hand beaker; probably potassium sulfate in the salt bridge.
		It's a voltaic cell because the chemical reaction is causing the flow of electric current.
		So several of these cells have to be put in sequence with one another to increase the voltage up to those amounts.
	dl.clackamas.cc.or.us /ch105-09/voltaic.htm (0 words)

	voltaic cell. The Columbia Encyclopedia, Sixth Edition. 2001-05
		The difference in the oxidation potentials of the two metals provides the electric power of the cell.
		The voltaic cell is sometimes also called the galvanic cell.
		The names refer to the 18th-century Italian scientists Alessandro Volta and Luigi Galvani.
	www.bartleby.com /65/vo/voltaicc.html (158 words)

	Batteries, National Science Museum Maynooth
		It was Alessandro Volta (1745-1827), the Italian scientist, who invented the electric battery, or "voltaic cell", in 1799.
		Entry 056 is a later version of the voltaic "pile".
		Volta showed that the animal component was unnecessary.
	www.may.ie /museum/batteries.html (0 words)

	Voltaic Cells (Site not responding. Last check: 2007-10-09)
		A voltaic cell (See Figure 1) is an electrochemical cell in which a spontaneous reaction generates an electric current.
		A concentration cell is a voltaic cell in which both electrodes and solutions are identical, but the solutions have different concentrations.
		Write the half cell reactions for your cells and calculate their expected cell potentials using the table of standard reduction potentials from your text.
	www.pitt.edu /~n3lsk/0114/macrovoltaicproc.html (0 words)

	Electrochemical Cells
		An extremely important class of oxidation and reduction reactions are used to provide useful electrical energy in batteries.
		Electrochemical cells which generate an electric current are called voltaic cells or galvanic cells, and common batteries consist of one or more such cells.
		An electrochemical cell which causes external electric current flow can be created using any two different metals since metals differ in their tendency to lose electrons.
	hyperphysics.phy-astr.gsu.edu /hbase/Chemical/electrochem.html (0 words)

	CBC4Kids: History of Inventions, a timeline from Pottery to Computers. (Site not responding. Last check: 2007-10-09)
		A battery, or electric cell, is a device that converts chemical energy into electricity.
		In 1774, Volta was a physics professor at the Royal School of Como, Italy, where he developed an idea for an instrument that produced controlled charges of static electricity.
		The problem with the voltaic cell was that it lost power rapidly once current was drawn from it.
	www.cbc.ca /kids/general/the-lab/history-of-invention/battery.html (0 words)

	Luigi Galvani
		He devised an arc of two metals with which contractions could be induced and in 1791 published his results, attributing the source of electricity to the animal tissue.
		The explanation was disputed by Volta, who correctly believed that the electricity originated in the metallic arc.
		voltaic cell - voltaic cell, a simple device with which chemical energy is converted into electrical energy.
	www.factmonster.com /ce6/people/A0820096.html (0 words)

	Voltaic cell -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-09)
		(An electric cell that generates an electromotive force by an irreversible conversion of chemical to electrical energy; cannot be recharged) Galvanic cell
		(Battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta) Voltaic pile
		see also: (additional info and facts about battery (electricity)) battery (electricity), (Cell that produces electricity by oxidation of fuel (hydrogen and oxygen or zinc and air); for use in electric cars) fuel cell
	www.absoluteastronomy.com /encyclopedia/v/vo/voltaic_cell.htm (0 words)

	Voltaic Backpack, Solar Backpack, Solar Bag
		The Voltaic solar bags are mobile power generators, designed to charge your devices without tying you to a power outlet, which makes them ideal for traveling.
		It also includes an AC travel charger and a car charger for charging the battery when solar charging is not practical.
		A typical cell phone will take 4-6 hours to charge in direct sun- see approximate charging times.
	www.voltaicsystems.com (0 words)

	VOLTAIC CELL (Site not responding. Last check: 2007-10-09)
		A voltaic cell uses a spontaneous chemical reaction to generate an electric current.A voltaic cell in a circuit consists of:
		Figure 1:voltaic cell :As long as there is an external circuit, electrons can flow through it from one electrode to another.
		Because zinc tends to lose electrons more readily than copper, zinc atoms in the zinc electrode lose electrons to produce zinc ions.The net result is that zinc metal reacts with copper ions to produce zinc ions and copper metal.
	ro.zrsss.si /badoko/voltaic_cell.htm (0 words)

	Earth battery -- An earth battery is an early type of voltaic cell buried in... (Site not responding. Last check: 2007-10-09)
		Earth battery -- An earth battery is an early type of voltaic cell buried in...
		An earth battery is an early type of voltaic cell buried in the ground so that the soil acts as the electrolyte.
		The electrodes are made of two dissimilar metals such as iron and copper.
	earth-battery.en.tracking24.net (0 words)

	Knutsen's Chem 160 Lab: Voltaic Cell Potentials (Site not responding. Last check: 2007-10-09)
		Your measured cell potentials will be compared to the accepted values which can be found in the tables in your text.
		The potential, or EMF, of a cell is a measure of the tendency of the electrons to flow, and is dependent on the difference in oxidizing or reducing strength of the two half–cells.
		As mentioned above the chemical connection between the two halves of a voltaic cell is made by a salt bridge.
	www.ivygreen.ctc.edu /knutsen/chem160/vltaicll.html (0 words)

	Online Dictionary for French English, Spanish English, Italian English, and more. (Site not responding. Last check: 2007-10-09)
		A number of voltaic cells arranged in series or parallel; SYN: galvanic battery.
		An electric cell that generates an emf by an irreversible conversion of chemical to electrical energy; cannot be recharged; SYN: galvanic cell, primary cell.
		Voltaic cells arranged in series; the earliest electric battery devised by Volta; SYN: pile, galvanic pile.
	www.ultralingua.net /index.html?action=define&text=voltages&service=&searchtype=stemmed&service=english2english (0 words)

	oxidation reduction
		MU #3 In an electrochemical cell, oxidation occurs at the anode and reduction at the cathode.
		When the oxidized electrode is completely used up the cell voltage is zero and the cell has reached equilibrium since the concentrations are not longer changing.
		The change of charge in cells is a problem because e- will no longer flow if they find another pathway and over time the cell will no longer function.
	www.chemcool.com /regents/oxidationreduction/aim3.htm (0 words)

	Electrochemistry V (Site not responding. Last check: 2007-10-09)
		Volta assembled (piled up) different metal disks (e.g., copper and zinc) separated by solution soaked pasteboards, repeating the pattern many tens of times.
		This was essentially a battery containing many series-coupled Daniell cells (a cell which was a later improvement) providing rather high cell voltage and current capabilities, but very short life time.
		An electrochemical measuring technique used for electrochemical analysis or for the determination of the kinetics and mechanism of electrode reactions.
	www.corrosion-doctors.org /Dictionary/Dictionary-V.htm (0 words)

	Photometry using a photo voltaic cell (Site not responding. Last check: 2007-10-09)
		An EEL, 2 cm diameter selenium cell without a load will give a rapidly increasing voltage with increasing illumination until it saturates at about 0.5 volts.
		Putting a load of about 100 ohms on the cell will reduce its output to 250 millivolts under strong sunlight conditions, but now the output will be linearly related to the illumination.
		From the above it can be concluded that the internal resistance of the cell in strong sunlight is about 80 ohms.
	staff.um.edu.mt /rlib1/photometry.htm (0 words)

	Redox Reactions - Title
		This is accomplished by constructing a voltaic cell.
		A voltaic cell relies in separating the reactants into two chambers and therefore forcing the electrons to travel through electrodes to perform the oxidation and the reduction.
		A sketch of a voltaic cell is shown in the next page.
	www.chemistry.nmsu.edu /studntres/chem112.spring.1997/Redox.html (0 words)

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