5.2 Chemical cells & fuel cells (Triple)
No description yet. This curated deck is ready for daily study.
Card preview (7)
What is a cell?
A cell is composed of two electrodes dipped in an electrolyte solution. It produces electricity from a chemical reaction.
What is a battery?
A battery consists of two or more cells connected in series.
What determines the voltage obtained from a cell?
Reactivities of metals used as electrodes and the identity and concentration of an electrolyte.
State the advantages and disadvantages of using cells and batteries.
Advantages: ● more or less cheap ● some are rechargeable ● a convenient source of electrical energy Disadvantages: ● harmful chemicals
Describe rechargeable and non-rechargeable cells
Rechargeable: Chemical reactions are reversed when an external current is supplied Non-rechargeable: Reactants are used up, cannot be recharged
What is a fuel cell? (Higher)
Fuel cells are supplied by fuel and oxygen to oxidise the fuel to generate electricity.
What are the advantages and disadvantages of hydrogen fuel cells?
Advantages: ● no pollutants ● no recharging Disadvantages: ● Flammable ● Hydrogen is difficult to store ● Fossil fuel production ● Toxic chemicals ● Expensive production of H2 by electrolysis