cells and batteries

Question 1

cell cons

Answer 1

only produce electricity for some time until reactants run out and reaction stops

Question 2

what alters potential difference

Answer 2

greater diff in reactivities increases pd
electrolyte also affects it

Question 3

what is a battery

Answer 3

two or more cells connected in series

Question 4

rechargeable cells

Answer 4

reaction can be reversed when electricity is applied

Question 5

H2 fuel cell advts

Answer 5

produce elec as long as hydrogen is provided
dont decrease efficiency
source of drinkable water
no harmful waste

Question 6

hydrogen cell disadvts

Answer 6

hydrogen is explosive and difficult to store safely
relatively low voltage produced so several are need together

Question 7

rechargeable battery disadvts

Answer 7

run out and need to be recharged
store less electricity the more charging cycles they go through
eventually need to be replaced

Question 8

rechargeable advs

Answer 8

no dangerous fuels required
can produce greater pd than hydrogen fuel cell

Question 9

overall hydrogen fuel cell eq

Answer 9

2H2 + O2 -> 2H2O