Alternative fuels Flashcards
What is carbon neutrality?
The idea that a fuel sources will not change the amount of CO2 in the atmosphere when it is burned.
why are fossil fuels not considered carbon neutral?
when they absorbed CO2 millions of years ago, the CO2 levels in the atmosphere were much higher, so when they are burned now, they increase the CO2 levels, so are not carbon neutral.
What is biodiesel?
the use of materials in vegetable oils which can be mixed with ordinary diesel to be used as fuel.
what is bioalcohol?
bioethanol is a common one, using bacteria to make high concentration alcohol which is then used a fuel
what are disadvantages of biofuels?
they use a lot of land to grow fuel crops and have a low yield, though this is slowly increasing. They are also much more expensive to grow and transport, as well as to process at the moment than fossil fuels.
what advantages of biofuels?
they are much closer to being carbon neutral than fossil fuels and they do not require exploration and drilling costs.
what is a substitution reaction?
a reaction in which one atom or group of atoms replaces another atom or group.
biofuels use …… matter that has…………..
living matter that has died recently, not millions of years ago
biofuels could be made of
wood or crops
renewable energy sources are
sources of energy which are continuously replaced
non-renewable energy sources are
sources of energy which are not being replenished, except over geological timescales (millions of years)
renewable sources include
biofuels, sunlight, wind, tidal, wave and geothermal
in reality, few fuels are actually
carbon neutral
carbon neutral represents the idea that
no carbon dioxide is produced
the concerns for using fossil fuel base energy are
pollution produced in combustion
depletion of natural resources
climate change and global warming
