hydrogen Fuel cells assignment

What 2 "things" are needed for a hydrogen fuel cell to work continuously?

• hydrogen and a voltage

• hydrogen and Oxygen

• hydrogen and water

• Water and a voltage

Recap question - what are the anode and cathode?

• Anode = positive electrode, cathode = negative electrode

• Anode = negative electrode, cathode = positive electrode

Recap question - which is the correct saying in terms of remembering what oxidation are reduction are:

• Oxidation is reduction of oil rig

• reduction is loss of electrons, oxidation is gain

• Oxidation is loss of electrons, reduction is gain

• reduction is oxidation of oil rig

Which of these is the correct description of the reaction at the cathode in a hydrogen fuel cell?

• the oxidation of Hydrogen to form hydrogen ions and 4 electrons

• The reduction of hydrogen to form hydrogen ions and 4 electrons

• The reduction of oxygen with hydrogen ions and 4 electrons

• the oxidation of oxygen with hydrogen ions and 4 electrons

Which of these is the correct description of the reaction at the anode in a hydrogen fuel cell?

• water is decomposed using the heat of the fuel cell in order to form Hydrogen ions and oxygen ions

• Oxygen molecules and hydrogen molecules react to form water

• Oxygen and the H+ ions react with 4 electrons to form Hydrogen molecules

• Oxygen and the H+ ions react with 4 electrons to form water

Which of these are all advantages of the Hydrogen fuel cell?

• 1.) They need a continual supply of heat in order for them to work efficiently

  2.) they don't get less efficient unlike rechargeable batteries do

  3.) they can be a source of water

  4.) they are environmentally friendly as they only produce water and no greenhouse gases

• 1.) They continue to work and don’t need recharging as long as we provide Hydrogen

  2.) they get less efficient unlike rechargeable batteries do

  3.) they can be a source of water

  4.) they are environmentally friendly as they only produce water and no greenhouse gases

• 1.) They continue to work and don’t need recharging as long as we provide Hydrogen

  2.) they don't get less efficient unlike rechargeable batteries do

  3.) they can be a source of water

  4.) they are not environmentally friendly as they are really flammable and explosive

• 1.) They continue to work and don’t need recharging as long as we provide Hydrogen

  2.) they don't get less efficient unlike rechargeable batteries do

  3.) they can be a source of water

  4.) they are environmentally friendly as they only produce water and no greenhouse gases

Which of these statements are all disadvantages of hydrogen fuel cells?

• 1.) Hydrogen can be explosive and difficult to store

  2.) they produce a relatively low voltage so often need more than one fuel cell working together to produce a big enough voltage

  3.) the water produced can often be contaminated so cannot be used until it is cleaned and processed

• 1.) Hydrogen can be explosive and difficult to store

  2.) they produce a relatively low voltage so often need more than one fuel cell working together to produce a big enough voltage

• 1.) Hydrogen can be explosive and difficult to store

  2.) they produce a relatively low voltage so often need more than one fuel cell working together to produce a big enough voltage

  3.) hydrogen is really hard to obtain and because of this, it is expensive to buy

What is the overall balanced chemical reaction equation that occurs in a hydrogen fuel cell?

• 2H+(g) + 2O2(g) → 2H2O(l)

• 2H2(l) + O2(l) → 2H2O(l)

• 2H2(g) + O2(g) → 2H2O(l)

• 2H2(g) + O2(g) → H2O(l)