Fuel cells Flashcards
Energy change of reactions
New substances produced:
Bonds in reactants broken
New bonds made to form products
Requires energy (endothermic)
New bond formed (exothermic)
Measuring energy changes
Amount of energy produced in chemical reaction can be measured by mixing reactants in insulated container
Cells and batteries
Chemicals in cells react together to release electricity
How is simple cell made
Placing 2 different into a beaker containing an electrolyte
How are batteries made
2 or more cells connected together
What does voltage depend on
Type of electrode and electrolyte used
Cells in series
Produce higher voltage
Fuel cells
Efficient way of producing electrical energy
Most use hydrogen
How do they work
Hydrogen and oxygen supplied to fuel cell
Fuel is oxidised to produce potential difference(v)
Overall huydrogen oxidised to form water
Fuel cell advantages
Hydrogen fuel cells produce water (non-polluting)
Lightweight and small
No moving parts unlikely to break down
