sc16, chemical and fuel cells (paper 2) Flashcards
1
Q
what can be produced in chemical and fuel cells using reactions
A
a voltahe
2
Q
how can you make a chemical cell
A
- a piece of zinc dipped in zinc sulfate solution
- a piece of copper dipped in cooper sulfate solution
- a piece of filter paper soaked in potassium chloride solution
- crocodile clips, wires, voltmeter
3
Q
what happens in a hydrogen-oxygen fuel cell
A
- hydrogen and oxygen are used ro produce a voltage
- water vapour is the only product
- there is no combustion
4
Q
give the symbol equation for what happens in a hydrogen-oxygen fuel cell
A
2 H2 (g) + O2 <–> 2 H2 (g)
5
Q
what happens in a chemical cell during a reaction
A
- electrons flow through from zinc to copper (zinc is more reactive)
- ions pass through the filter paper from one beaker to the other
- which completes the circuit
6
Q
advantages of chemical cells
A
- suitable for portable appliances
- cheap to manufacture
7
Q
disadvantages of chemical cells
A
- may contain harmful substances
- don’t produce voltage when a reactant is used up (go ‘flat’)
8
Q
advantages of hydrogen-oxygen fuel cells
A
- produce water as the only waste
- produce a voltage as long as the fuel and air are supplied
9
Q
disadvantages of hydrogen-oxygen fuel cells
A
- not suitable for portable appliances
- expensive to manufacture
