Energy changes triple Flashcards
in an electrochemical cell, what is an electrode?
a liquid that contains ions that reacts with the electrodes
how do you form a battery from 2+ cells?
connect them together in a series
what is a fuel cell?
an electrical cell supplied with fuel and oxygen and uses energy from the reaction to produce electrical energy
what solution does hydrogen oxygen fuel cell use?
potassium hydroxide
why do none rechargeable cells stop producing electricity?
the reaction stops as one reactant is used up
how can rechargeable cells be recharged?
the chemical reactions are reversed.
what do fuel cells use to produce electrical energy?
fuel and oxygen
what happens when the fuel enters the cell?
cell becomes oxidised starting up a potential difference
hydrogen fuel cell consist of?
hydrogen and oxygen
what is the oxidation reaction at the anode for hydrogen oxygen?
H2>2H+ + 2e-
at the cathode reduction occurs, what is the reduction half equation?
02 + 4H+ + 4e- > 2H2O
what’s the overall reaction of the hydrogen oxygen fuel cell?
2H2 +O2 >2H20
What element loses electrons at the anode?
Hydrogen loses an electron to produce H+ Ions (oxidation)
Element at cathode?
oxygen gains electrons from cathode and reacts with H+ ions to make water which is reduction
advantages of hydrogen fuel cell
no pollutants are produced
doesn’t need to be electrically charged
