OC54 list two examples of fossil fuels
What substances do you know as a fuel ?
What have they all in common?
Flammable,
Single use, once we burn them the energy that they give off can not be used again.
When you burn these fuels what happens ??
Heat energy is given off,
this energy comes from the chemical bonds in the Fuel
Chemical energy of a fuel
Are fuels important to Humans ? Why ?
A fuel is a material that is used as a source of energy. Burning or combustion of a fuel is a process by which energy is released from many fuels.
What happens when you burn fuels ?
Gives out heat and light energy
Combines Carbon in the fuel with oxygen from the air and gives out Carbon Dioxide
Combines Hydrogen in the fuel with oxygen from the air and gives out water vapour
Burning means we have a fire, fires can only exist if they satisfy the Fire Triangle ....
How to Put out a fire ???
In America before fossil fuels being found, methane in 1821, whale oil was used to light homes.
OC53 recall that fossil fuels are sources of hydrocarbons, and that they produce CO2 and H2O when burned
Recall fossil fuels are sources of hydrocarbons
Fossil fuels are found in the ground.
Fossil fuels are made from Plant (& animal) remains.
The oil that comes out of wells is called crude oil. This crude oil is a raw material.
It is called crude as it has not yet been refined into useful products.
Gasoline is (mostly) a mixture of hydrocarbons. The name "hydrocarbons" suggests that chemically they include Hydrogen and Carbon.
burning methane
Methane + Oxygen → Water + Carbon Dioxide
So the products of combustion of (gasoline) fuels in air are primarily water and carbon dioxide.
Homework Pg226 q 1-4
follow on to see an animation of fractional distillation
http://science.howstuffworks.com/environmental/energy/oil-refining4.htm
follow on for cracking, the way the petroleum industry has made useless chains into desirable and profitable products.
and that they produce CO2 and H2O when burned
Prove that CO2 and H2O are given off during burning a fuel
You may already have learned about a test for Water .... mmm..... what was is again
C______ C______ changes colour from _____ when it is dry to _______ when it is in the presence of Water
L_________ goes cloudy or milky when ________ _________ is passed through it
click on image to see a larger version
The Ice & Water cools down the gas that comes from the Candle, some liquid condenses on the side of the U tube, test this liquid with white Copper Sulphate, it goes Blue, this is proof the liquid is water (H2O)
Limewater is a test for Carbon Dioxide, it goes Milky when CO2 passes through it. It goes milky after a little while, thus shows that burning HydroCarbons releases Carbon Dioxide
Burning fuels that do not combust properly can result in Carbon Monoxide being released
On average, crude oils are made of the following elements or compounds:
do questions q 1-8
OC55 describe the role of the combustion of fuels and of SO2 in the production of acid rain, and describe the effects of acid rain
On average, crude oils are made of the following elements or compounds:
When fuels are burned in Oxygen, they release more than CO2 and H2O, they also burn some Sulphur that is also contained in the fuels. This creates sulphur dioxide SO2.
The gas that is most abundant in air is Nitrogen, this also can react in the intense heat of an engine or furnace to produce Nitrous Oxides NOx. Both SO2 and NOx react with Water in the atmosphere to form acidic solutions, Sulphuric acid and Nitric acid.
These are very strong acids. These acids become apart of the rain, and fall many hundreds or thousands of kilometers from where the cause of this pollution is located.
Carbon Monoxide can also be created in this process
Modern cars include a catalytic converter in the exhaust system. The converter gives a "second chance" for these compounds to be fully burned before they are released into the air.
OC56 describe the effect of acid rain on limestone and on plants
on limestone
Limestone dissolves in Acid rain , leading statues and buildings to lose their definition/shape.
limestone is http://en.wikipedia.org/wiki/Limestone Calcium Carbonate, http://en.wikipedia.org/wiki/Calcium_carbonate is also the same as blackboard chalk
lets experiment on that
How could we ??? What could we measure ??? What apparatus would we need ??
on plants
The Acid rain reacts with minerals from the earth that are required by plants for healthy growth. As the plant loses access to these minerals the growth slows and eventually stops.
The acid rain also make the soil more acidic, which some plants cannot survive in as they prefer either neutral or more alkaline soils. In naturally acid areas, the pH levels can become too low for plants to survive.
on animals
Fish that live in lakes affected by acid rain die as the plankton / algae they eat is unable to survive in the low pH water.
Homework devise an experiment to see the effect of acid rain on limestone / plants. Include a control.
Places significantly impacted by acid rain around the globe include most of eastern Europe from Poland northward into Scandinavia.
OC57 understand that natural gas is mainly methane
Test yourself here
http://www.sciencequiz.net/jcscience/jcchemistry/fossilplastic/fossilplastic.htm
The Kyoto Protocol calls for the introduction of biofuels on the transport fuel market in order to reduce greenhouse gas emissions. This makes Lurgi your ideal partner thanks to its longstanding experience and outstanding references.
http://www.lurgi.info/website/index.php?id=19&L=1
This is very unusual, what do you think about this?
Global Warming
https://sites.google.com/site/hcsgreenschools/whywearedoingthis
http://blog.sccscience.com/2010/09/what-are-real-alternatives-to-oil.html