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Answer all parts Discuss the use of hydrogen as a replacement for fossil fuels under the following headings: The problem with the fuels currently being used. [7 marks] Methods of producing hydrogen and ways of using it as an energy source. [10 marks] is the use of hydrogen as a fuel a solution to the worlds energy needs? Discuss [8 marks] (b) (c)

Answer 1

8. (a) The problem with the fuels, currently being used :- petrol, diesel, kerosene, crude bil etc., are obtained from petroleum. Petroleum and natural gas (CNG) are fossil fuels. They are obtained from fossils. (Dead plants & animals] * It takes hundreds of years to obtain fossil fuels. * Their quantities are limited. So they may extinct.

This fossil fuels on (burning) combustion release poisonous gases. CO2 causes global warming They cause air pollution. O These are the main disadvantare (De (6) Methods of producing hydrogen: - (i) By electrolysis of water 2 How electrolitie 2H+ + OT (11) Reacting natural gas with high temperature steam- CO(g) + H0 (8) H₂ 1 8 + CO (1) High temperature steam reads with hydrocarbon fuel and forms hydrogen.

ways of using hydrogen as an еnела бои се - & Fuel cells to generate electricity and heat. They convert chemical energy into electrical energy. They are used in rockets and spaceships. * This fuel cell are o eco-friendly (do not release poisonous gases) ☺ Renewable source of energy It is highly powerful and efficient.

Hydrogen fuel is very efficient. More energy is obtained from hydrogen than others. ex- We can run our car with water but we need to build electrolysis cell to electrolyse water into hydrogen and oxygen. But 0 it is expensive. ④ Hydrogen is difficult to store.

④ Hydrogen is highly flammable & explosive. 7 Hydrogen is inturn obtained from fossil fuels.