GCSE Chemistry (Triple)
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what does the primordial soup theory state
that billions of years ago , the earths atmosphere was rich in nitrogen , hydrogen , ammonia and methane and lightening struck , causing a chemical reaction between the gases , resulting in the formation of amino acids . the acids collected in a primordial soup (a body of water out of which life gradually crawled ) the acids combined to produce organic matter which eventually evolved into simple living organisms
in the 1950's , Miller and Urey carried out an experiment that to prove the primordial theory , they sealed the gases in thier aperatus , heated them and applied an electrical charge for a week . they found that
amino acids were made , but not as many as there are on earth . This suggets that the theory could be along the right lines but isnt quite right
what were the raw materials used in the Miller Urey experiment
- carbon dioxide
name some intermediate products formed by the Miller Urey experiment
- hydrogen cyonide
- diamono methanol
what did the primordial soup contain that was considered to be of significance
amino acids which are the building blocks of protiens
does the primordial soup theory explain how life started on earth
no as it only shows how some molecules needed for life may have been formed
why do we not know how life was fist formed
because we were not there when earth was first formed
the earths crust , oceans and atmosphere are the .... ..... of minerals and resources - we can get everything we need from them . for example we can ...... .... .... to get a variety products (e.g. nitrogen and oxygen) for use in ...
- ultimate source
- fractionally distill
to fractionally distill air we
air is .... to remove ...
it is then ... to around .... degrees C and becomes a ...
the misture is .... up
... is collected at -269 degrees C
as each substancw reaches its .... .. it ...... and becomes a .... which is collected seperately
..... and .... come out together so another column is used to seperate them
- boiling point
burning fossil fuels releases
carbon dioxide and as the world's become more industrialised , more fossil fuels have been burnt in power stations and car engines , this carbon dioxide is thought to be altering our planet
an increase in carbon dioxide is causing
the oceans are a natural store of carbon dioxide they absorb it from the atmosphere however
extra carbon dioxide we are releasing is too acidic . this is bad news for coral and shell fish and it also means that in the future the oceans wont be able to absorb any more carbon dioxide
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