Cells And Batteries Flashcards
How do we create electricity ?
Placing two different metals into an electrolyte then we can produce electricity
What is an electrolyte ?
A solution that can conduct electricity for example a solution of an ionic compound
What do you connect to the two metals ?
What does this do ?
A volt meter
It allows for an electric current to flow through the wire
What can we use cells for ?
Generating electricity
How long can a cell produce electricity so what does this mean ?
They can only produce electricity for a certain period of time meaning the chemicals in the cell will run out and the reaction stops
What is the key point with cells in relation to the metals used which allows it to conduct electricity ?
The metals have to be different meaning they have different reactivities
What cell would you expect to produce a large voltage ?
A. magnesium and copper
B. Copper and zinc
Magnesium and copper
They have a large potential difference in reactivity therefore producing a higher voltage
What is the key fact with the reactivity of the metals used ?
The greater the difference between the reactivity of the metals, the greater the potential difference produce
What does the electrolyte affect ?
The potential difference
What are the four factors that affect the voltage?
- Type of electrodes
- type of electrolyte
- temperature of electrolyte
- concentration of electrolyte
What is a battery ?
Two or more cells connected in a series to produce a greater voltage
If two cells with an individual potential difference of 2.5 are combined, what is the voltage produced ?
5v
2.5x 2= 5
What is the rule with the electrolyte ?
- It has to contain ions so an electrolyte of water will produce a voltage of 0 as there are no ions
- A solution with an electrolyte of sodium chloride will produce a charge
What is the good way of remembering oxidation and reduction ?
OIL RIG
oxidation is loss of electrons
Reduction is the gaining of electrons
What are alkaline batteries ?
Non rechargeable cells and batteries
Here the chemical reaction stops when one of the reactants is used up so can only be used once