Chapter 4 - Cells and Batteries
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13 Terms
Define a cell ?
a system that contains chemicals which react and produce electricity
What is a cell composed of ?
A cell contains two different electrodes in contact with an electrolyte
What is voltage ?
The charge difference between 2 different metals (electrodes) submerged in an electrolyte
The difference in reactivity of the electrodes is _______ ____________ to the voltage of the cell
Directly proportional
Left side electrode is the ?
Least reactive
Right side electrode is the ?
Most reactive
What does it mean if the voltage is negative ?
The most reactive metal as been placed in the left side of the table
What 2 factors does the voltage of a cell depend on ?
concentration of ions in the electrolyte
Identity of the metal electrodes
Define a battery ?
It is 2 or more cells connected together in series
What is the voltage of a battery ?
The voltage of the cells added together
Why are non-rechargeable batteries so ?
the chemical reaction in a cell is irreversible
Overtime as the reaction occurs the metal ions in the electrode and ions in the electrolyte get used up (formed into products of the reaction)
Because one of the reactants has been used up the reaction cannot occur , therefore no electricity is produced
The products can be reformed into the reactants so the batter cannot be recharged
How are rechargeable batteries charged ?
By connecting them to an external electrical current
What is a fuel cell ?
an electrical cell that's supplied with a fuel and oxygen (or air) and efficiently transfers the energy released by the reaction between them as electricity.