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Unit 3 VCE Chemistry - Fuels, Redox, Galvanic, Electrolysis, Equilibrium
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Fuels, Redox, Galvanic, Electrolysis, Equations, ChemistryVCE, Vce Chem, Equilibrium
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,, fuels of
•
fuels are a source chemical energy .
◦
fuels can be renewable or non -
renewable .
non renewable -
◦
resources that are used at a rate faster than they can be
replaced .
formation fossil fuels from &
microorganisms
formed ancient
°
were plants ,
animals
.
'
the organic still retains some of the chemical
matter
energy
the plants accumulated from photosynthesis .
•
fossil fuels form over millions of years .
crude oil fuel crude oil is
°
a mixture of hydrocarbons , mainly alkanes .
◦
crude oil is separated into fractions gases
pi ,
°
fractional distillation does not produce cool
petrol
pure substances .
eg :
LPG ,
diesel & kerosene
'
jet fuel
'
biochemical
°
Shortened to biofuels .
oil I. , fuel oil
•
derived from plant material . hot
eq . grain , sugarcane or
vegetables coils )
☐
two main biofuels are bioethanol & biodiesel .
◦
burning biofuels is not considered to increase atmospheric
CO2 levels .
This is because the photosynthesis process used to
produce plant matter removed an equal amount of CO2 .
↳ carbon neutral
6 CO2 6 H2O " +
photosynthesis (g)
+
(1)
(
61-11206 ( aq) 602 (g)
the glucose is converted cellulose & starch
°
to .
bioethanol
°
In the formation of bioethanol ,
starch in plants is broken
down into glucose by enzymes and is then fermented into
ethanol & coz in the absence of oxygen .
↳ no onygen = anaerobic conditions
◦
fermentation stops when ethanol content is between 10% -
20% .
(
61-11206 ( qq)
1 2 CH
} CHZOH ( qq)
+ 2 C. 02cg)
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