Fuel Cells

What is the primary source of energy for life as we know it?

• The Sun

• Biomass

• Electricity

• Hydrogen

What process releases oxygen into the atmosphere and forms biomass?

• Combustion

• Electrolysis

• Photosynthesis

• Respiration

What is split to store hydrogen as a fuel for motor vehicles?

• Methane

• Water

• Carbon dioxide

• Biomass

What is most efficiently done in a fuel cell?

• Burning biomass

• Rejoining hydrogen with oxygen

• Splitting water into hydrogen and oxygen

• Ionizing metals

What are the reactants in a fuel cell?

• Metals

• Gases

• Liquids

• Solids

What is a major advantage of combining fuel and oxygen in a cell?

• It produces more waste heat

• It has a maximum efficiency of about 50%

• It can convert most of the chemical energy to electricity

• It requires more energy input

What is a major problem with using hydrogen fuel cells in vehicles?

• Generating enough electricity

• Producing oxygen

• Storing and transporting the hydrogen

• Finding enough water

What is the current primary source of industrial hydrogen?

• Water

• Methane

• Biomass

• The atmosphere

What is the hope for a clean and simple source of hydrogen?

• Extracting it from the atmosphere

• Burning biomass

• Using sunlight to split water molecules

• Electrolyzing methane

What is a potential solution for storing hydrogen?

• As a gas under pressure

• In hydrides

• As a liquid at high temperature

• In large tanks