R1.3 Combustion Reactions

Question 1

Methanol Fuel cell

Answer 1

methanol produces electrical energy from chemical energy
* contribute to carbon emissions

anode = oxidized & burnt to carbon dioxide
cathode = oxygen from the air acts as an oxidizing agent and is reduced to water

Question 2

methanol fuel cell reaction

Answer 2

CH3OH(aq)+H2O(l)⟶COX 2 (g)+6H2 + (aq)+6e-

Question 3

Which type of fuel is most likely to combust incompletely

Answer 3

coal = has the must impurities

Question 4

Biofuel cells

Answer 4

• Biofuels = organic compounds produced by carbon dioxide fixation through photosynthesis.
• Burning produces carbon dioxide, but there is no net effect as the carbon dioxide fixation counteracts this production.
• = carbon neutral as the carbon atoms in the biofuel originally come from the carbon dioxide fixed from the atmosphere.

Question 5

Biofuel

Answer 5

organic compounds produced by carbon dioxide fixation through photosynthesis.

Question 6

Hydrogen Fuel celll

Answer 6

• water is split
• hydrogen is oxidises at anode
• electrons from H+ flow from anode to cathode
• oxygen is reduced at cathode