mr4iE

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https://www.youtube.com/watch?v=wwFrRy
mr4iE
• batteries
•containers of chemicals waiting to be
converted to electricity
• the chemical reaction does not take
place until the two reactions are
connected (you turn it on)
• typically create 1.5 to 9 volts
McGraw Hill Flash animation
• the oxidation and reduction reactions are
separated
• electrodes (two different strips of metals) are
placed in each electrolyte (solution that
conducts electricity)
• electrons move through a wire connecting
the two electrodes
• salt bridge connects the reactions
• chemical energy changes electrical to
energy through a spontaneous redox
reaction
• greater the difference in reactivity of metals
means greater the voltage
• the more reactive metal (higher on the
activity series) is the negative electrode
(anode)
•
oxidation occurs here causing loss of e• ex) Zn (s)  Zn2+ (aq) + 2e-
• the less reactive metal (lower on the activity
series) is the positive electrode (cathode)
•
reduction occurs here causing the gain of e• ex) Cu2+ (aq) + 2e-  Cu (s)
• ions move through a salt bridge connecting
the two electrolyte solutions to keep the ions
created from building up in either of the
solutions
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