Chemistry: Year 10 Term 2: Fuel Cells 0.0 / 5 ? ChemistryEnergy of reactions/Exothermic and endothermic reactionsGCSEAQA Created by: Charlotte HerondaleCreated on: 29-11-18 11:27 What are the two types of hydrogen fuel cell? (2) Acidic and alkaline 1 of 19 The anode and cathode are sandwiched around what? (1) Electrolyte 2 of 19 H2 is added to which electrode? (1) Anode (+) 3 of 19 O2 is added to which electrode? (1) Cathode (-) 4 of 19 What is the catalyst? (1) Platinum 5 of 19 What does this cause hydrogen to split into? (2) Protons and electrons 6 of 19 Where do the electrons go? (1) Through an external circuit 7 of 19 Where do the protons go and end up? (3) Through the electrolyte and a semi-permeable membrane to the cathode 8 of 19 What happens at the cathode? (2) O2 is reduced, producing water 9 of 19 What ions are in the electrolyte for alkaline fuel cells? (1) OH- 10 of 19 Why must fuel cells be used together in batteries? (2) They do not produce enough voltage on their own 11 of 19 What is acid half equation for anode? (3) H2 -> 2H + 2e- 12 of 19 What is acid half equation for cathode? (3) O2 + 4H+ -> 2H2O 13 of 19 What is the alkali half equation for anode? (4) O2 + 2H2O + 4e- -> 4OH- 14 of 19 What is the alkali half equation for cathode? (3) H2 + 2OH- -> 2H2O + 2e- 15 of 19 What is the overall reaction? (2) Hydrogen + Oxygen -> Water 16 of 19 What is a regenerative fuel system? (3) Spare electricity can be used to reverse the reaction, creating O2 and H2 for storage and later use 17 of 19 Name 3 advantages of fuel cells. (3) Provides water; Renewable; One-step process uses less energy 18 of 19 Name 3 disadvantages of fuel cells. (3) Catalysts poisonous; O2 and H2 production uses energy, uses fossil fuels 19 of 19
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