biofuels

Question 1

what are biofuels

Answer 1

fuels that come from plant or animal products

Question 2

what are 4 advantages of biofuels

Answer 2

• less harmful to plants and animals if spilled
• renewable, unlike crude oil
• low carbon footprint
• burn cleanly, little sulfur dioxide

Question 3

what are 3 disadvantages of biofuels

Answer 3

• use large areas or farmland meant for crops
• can cause famine
• forests cleared to make land which could endanger species

Question 4

what are 2 ways to produce ethanol

Answer 4

hydration

fermentation

Question 5

explain hydration talk about energy costs pressure and purity

Answer 5

ethanol is mixed with steam to produce ethanol

high cost high pressure more pure product

Question 6

explain fermentation talk about energy costs and purity

Answer 6

it converts glucose into ethanol and carbon dioxide at 30 degrees in anaerobic condition
low energy costs and low pure product

Question 7

how is cracking carried out

Answer 7

hydrocarbons are heated into vapour and passed over steam or a hot catalyst, they are heated till thermal decomposition occurs

Question 8

what is polymerisation

Answer 8

when many small monomers join together to form polymers

Question 9

what do the properties of polymers depend on

Answer 9

monomer used

conditions it was made in

Question 10

what are thermosetting and thermosoftening polymers

Answer 10

thermosetting- polymers that don’t melt, strong covalent bonds between polymer chains

thermosoftening- soften easily when heated and reset when cooled down