Fuel cells

• What is a fuel cell?

  A type of electrochemical cell
• What do fuel cells convert energy between?

  Electrical and chemical forms
• What chemical reaction occurs in a hydrogen oxygen fuel cell?

  Hydrogen and oxygen form water
• What is the most common type of fuel cell?

  Hydrogen oxygen fuel cell
• What is the role of the electrolyte in a fuel cell?

  It allows ions to move through
• What is a common type of electrolyte used in fuel cells?

  Potassium hydroxide
• What are the electrodes in a fuel cell made of?

  Porous carbon
• What are the names of the two electrodes in a fuel cell?

  Anode and cathode
• Which electrode is negative in a fuel cell?

  Anode
• What allows electrons to flow in a fuel cell?

  A wire connecting the electrodes
• How does the role of the cathode differ in fuel cells compared to electrolysis?

  The cathode is positive in fuel cells
• What enters the anode compartment of a fuel cell?

  Hydrogen
• What enters the cathode compartment of a fuel cell?

  Oxygen
• What is produced as a result of the reaction in a fuel cell?

  Water and heat
• What happens to the water produced in a fuel cell?

  It leaves via the outlet
• What is the first step in the operation of a fuel cell?

  Hydrogen is oxidized by the anode
• What happens to hydrogen atoms during oxidation?

  They lose electrons
• What do the electrons do after being released by hydrogen?

  They pass around the wire to the cathode
• What do hydrogen ions do after being produced?

  They move through the electrolyte to the cathode
• What do hydrogen ions and electrons react with at the cathode?

  Oxygen
• How many hydrogen ions and electrons are needed to react with one oxygen molecule?

  Four hydrogen ions and four electrons
• What is formed when hydrogen ions and electrons react with oxygen?

  Two molecules of water
• What are the two half equations in a fuel cell?

  Oxidation of hydrogen and reduction of oxygen
• What does the overall equation of a fuel cell show?

  Combining oxygen and hydrogen to make water
• What drives the movement of electrons in a fuel cell?

  The potential difference across the cell
• What is the main idea behind using fuel cells?

  To replace fossil fuel engines and batteries
• What is a major benefit of hydrogen oxygen fuel cells?

  They produce no carbon dioxide or pollutants
• Why are fuel cells considered simpler devices than batteries?

  They last longer than batteries
• What is a downside of storing hydrogen?

  It takes up more space than fossil fuels
• Why is storing hydrogen considered dangerous?

  It is explosive when mixed with air
• What is a major problem with producing hydrogen fuel?

  It requires energy often from fossil fuels
• What should you do if you enjoyed the video?

  Like and subscribe