hydrogen fuel cells

Question 1

are chemical cells exo or endothermic

Answer 1

exo

transfer energy to surrounding

Question 2

how long do chemical cells produce a voltage

Answer 2

until one of the reactants is used up

Question 3

what’s caused a greater voltage

Answer 3

a greater difference in reactivity

Question 4

what do fuel cells do

Answer 4

produce a voltage as long as they’re provided with oxygen and fuel

Question 5

how is energy released in a fuel cell

Answer 5

fuel is oxidised at a low temp

energy released as elec not heat

Question 6

in a hydrogen-oxygen cell what’s the only chemical product

Answer 6

water

Question 7

+ and - of alkaline cells

Answer 7

cheap but hard to recycle

Question 8

+ and - of rechargeable cells

Answer 8

expensive

easy to reuse

Question 9

+ and - of hydrogen fuel cells

Answer 9

compact
no pollution

expensive
constant supply of flammable hydrogen gas

Question 10

what and why can hydrogen fuel cells be used in

Answer 10

spacecraft
be drunk
generate electricity all the time