Cells And Batteries Flashcards
What is an electrochemical cell?
A basic system made of two different electrodes in contact with an electrolyte.
What is the role of electrodes in an electrochemical cell?
They must conduct electricity and are usually made of metals.
What does the electrolyte do in an electrochemical cell?
It contains ions that react with the electrodes.
How is electricity produced in an electrochemical cell?
Chemical reactions between the electrodes and electrolyte set up a charge difference, producing electricity when connected by a wire.
What does a voltmeter measure in a cell?
The voltage of the cell.
What factors affect the voltage of a cell?
Type of electrodes, reactivity difference between electrodes, and electrolyte used.
How does reactivity of metals affect voltage?
The bigger the difference in reactivity, the higher the voltage.
What happens to the reactants in non-rechargeable batteries?
They get used up in irreversible reactions, and the battery stops producing electricity.
Why can’t non-rechargeable batteries be reused?
The products of the reaction can’t be turned back into reactants.
How do rechargeable batteries work?
Reactions are reversed by connecting the cell to an external electric current.
What happens when cells are connected in series?
The voltages of the cells add up, producing a higher overall voltage.
What is an example of a non-rechargeable battery?
Alkaline batteries.
If electrode A is less reactive than electrode B, will the voltage be positive or negative?
Positive
If electrode B is less reactive than electrode A, will the voltage be positive or negative?
Negative
