8E Flashcards
what is fuel
a fuel is a chemical substance from which stored energy can be transferred usefully to make things happen
what are the common fuels found in fuels
hydrogen,petrol,diesel,coal,oil and natrual gas
what type of energy is stored in fuels
chemical energy
what energy transfer occurs when fuels are burnt
chemical energy is transferred into thermal energy
what is combustion
a chemical reaction between a fuel and oxygen to produce an oxide
what is energy density
the amount of chemical energy stored per kilogram of fuel
what is required for combustion to occur
a chemical reaction between a fuel and oxygen to produce carbon dioxide
what is an oxidation reaction
a spark or a flame and oxygen (fire triangle)
why is combustion called an oxidation
any reaction that occurs with oxygen
what is combustion called an oxidation reaction?
during combustion, a fuel will react with oxygen
what is a fossil fuel
a fuel formed from the dead remains of organisms over millons of year
what are three types of fossil fuel
coal, oil and natrul gas
what is hydrocarbon?
a compound made up of only hydrogen a carbon atoms
what does a power station do?
a power station uses thermal energy from fuels to power generators and produce electricity
why are fossil fuels used in power stations
high energy density and are east to source
what are the advantages of fossil fuels
fuel is readily available and inexpensive to use reliable source of high density fuel
what are the disadvantages of fossil fuels
non-renewable
produces carbon dioxide when burning contributing
what two pollutants are produced by incomplete combustion
carbon monoxide ans soot
what gas is produced by burning hydrocarbons with impurities
sulfur dioxide
what is used in most cars to remove polluting gases from the exhaust
catalytic converters
what type of reaction is used in chimneys and on the ground to reduce the effects of Acid Rain
neautralisation
what does global warming mean
the earth heating up
what does climate change mean
distruption to the earths weather system
what is the enhanced greenhouse effect?
an increase in the greenhouse effect caused by human emissions
what is the link between greenhouse gases and climate change?
greenhouse gases leads to enhanced greenhouse effect leads to iglobal warming leads to climate change
