4.5.2 Chemical cells and fuel cells Flashcards
What do cells contain that produces electricity?
Cells contain chemicals which react to produce electricity.
What factors affect the voltage produced by a cell?
The voltage produced by a cell is dependent upon the type of electrode and electrolyte.
How can a simple cell be made?
A simple cell can be made by connecting two different metals in contact with an electrolyte.
What are batteries composed of?
Batteries consist of two or more cells connected together in series to provide a greater voltage.
What happens in non-rechargeable cells and batteries?
In non-rechargeable cells and batteries, the chemical reactions stop when one of the reactants has been used up. Alkaline batteries are non-rechargeable.
What allows rechargeable cells and batteries to be recharged?
Rechargeable cells and batteries can be recharged because the chemical reactions are reversed when an external electrical current is supplied.
What should students be able to do regarding cells?
Students should be able to interpret data for relative reactivity of different metals and evaluate the use of cells.
What is the source of fuel for fuel cells?
Fuel cells are supplied by an external source of fuel (e.g., hydrogen) and oxygen or air.
What is oxidised in a hydrogen fuel cell?
The overall reaction in a hydrogen fuel cell involves the oxidation of hydrogen to produce water.
What do hydrogen fuel cells offer as an alternative?
Hydrogen fuel cells offer a potential alternative to rechargeable cells and batteries.
What should students be able to evaluate regarding hydrogen fuel cells?
Students should be able to evaluate the use of hydrogen fuel cells in comparison with rechargeable cells and batteries.
What additional skill should higher tier students have regarding hydrogen fuel cells?
Higher tier students should be able to write the half equations for the electrode reactions in the hydrogen fuel cell.
