Intro to org chem: Alternative sources of energy

Question 1

Biofuel

Answer 1

• Bio gas

- Bio diesel

Question 2

Bio gas

Answer 2

• when organic matter (waste material frm plants and animals)
• decompose in absence on air

Question 3

Bio diesel

Answer 3

• frm plant oils

- e.g. palm oil

Question 4

Hydrogen gas

Answer 4

• electrolysis of water

- cracking of petroleum

Question 5

Hydrogen gas (+ve)

Answer 5

• doesn’t cause pollution when burnt (water is only product)
• renewable source of energy (frm electrolysis of water)
• efficient source of energy (produces 2x amt of H.E. when burnt compared to common fuels ie. petrol)

Question 6

Hydrogen gas (-ve)

Answer 6

• no cheap sources of H2 ( obtaining from electrolysis is expensive, currently obtained frm cracking of non-renewable energy sources e.g. petroleum)
• extremely flammable & explosive (special precaution when transporting and storing)

Question 7

Ethanol

Answer 7

• from sugar cane

- fermentation of sugar soln

Question 8

Ethanol (+ve)

Answer 8

• when burnt, produce less CO and soot compared to petrol, contains lower % of carbon
• renewable source of energy (sugar cane)

Question 9

Ethanol (-ve)

Answer 9

• large areas of land need to grow sugar cane