Galvanic & Fuel cells for Energy

• What is a Galvanic/Voltaic Cell?

  An electrochemical cell where chemical energy is converted to electrical energy
• Examples of galvanic cells?

  Cells in your mobile phone and laptop
• What is a battery?

  A combination of cells
• What does a galvanometer do?

  Detects electric current
• What is the salt bridge made from?

  Unreactive electrolyte (chemical substance that conducts electric currents)
• The Reducing Agent is connected to which electrode?

  The anode (-)
• The Oxidising Agent is connected to which electrode?

  The cathode (+)
• How do the electrons move in Galvanic Cells?

  They move from the anode side, to the cathode side. Anode loses electrons, cathode gains electrons.
• In Galvanic Cells, Oxidation occurs at the Anode (-) and reduction occurs at the cathode (+)
• what are anions and cations and where do they go?

  Anions are negatively charged ions, they go to the anode

  Cations are positively charged ions, they go to the cathode
• Label the Daniel (galvanic) cell.

  A) Anode

  B) -

  C) cathode

  D) +

  E) salt bridge

  F) anions

  G) cations

  
• Direct Reactions are?

  Spontaneous exothermic reactions.

  When reactants are in direct contact - chemical energy turns to heat energy.
• If no metal is present in a half cell, then an inert/unreactive electrode like platinum or graphite is used.

  eg: $Fe^{3+}_{aq} / Fe^{2+}_{aq}$
• If one conjugate in a half cell is a gas what happens?

  A gas electrode is used.

  eg: $H^+$$_{aq}/H_{2(g)}$
• What is the purpose of the salt bridge?

  Balance charges formed in the two compartments, prevent one side from accumulating a negative/positive charge which prevents the reaction from continuing.