Electrochemistry Fuel Cells and Batteries

What is one potential problem with using hydrogen fuel cells

• They are innefficient

• They produce harmful chemicals

• Hydrogen is highly flammable

What does the voltage of a cell depend on?

• The size of the cell

• How much oxygen is present

• The difference in reactivity of the two electrodes

Chemical

cells produce a voltage. When do they stop producing a voltage and 'go

flat'?

• When one of the reactants has run out

• When they get too hot

• When they reach the expiry date on the cell

What

is the only chemical product when hydrogen and oxygen are reacted together

in a fuel cell?

• Water

• Electricity

• Carbon dioxide

Which

is not an advantage for using a hydrogen-oxygen fuel cell in a space

station?

• No moving parts

• Small and compact size

• They generate useful heat for warmth

Where

can hydrogen be obtained from on the space station without transporting it

from Earth?

• From plants

• From water

• From the Moon

Hydrogen

can be used as a fuel for cars. Which of the following is an advantage of

using hydrogen instead of petrol?

• It is cheaper

• Exhaust gases contain only water

• It is easier to store

Which

of the following is a disadvantage of using hydrogen as a fuel?

• There are currently very few hydrogen filling stations in the UK

• It directly contributes to global warming

• Hydrogen is radioactive

What

is a disadvantage of a rechargeable cell when compared to an primary cell?

• It is smaller

• It costs more to manufacture

• It can be reused many times

In

addition to a fuel, what other chemical is needed by a fuel cell?

• Nitrogen

• Oxygen

• Methane