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A chemical substance is any material with a definite chemical composition, no matter where it comes from. Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p5, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. For example, a sample of water has the same properties and the same ratio of hydrogen and oxygen whether the sample is isolated from a river or made in a laboratory. A pure substance cannot be separated into other substances by any mechanical process,Ebbing, D. D.; Gammon, S. D. General Chemistry, 7th ed., p12, Houghton Mifflin, Boston, Massachusetts, 2002.. Typical chemical substances found in the home are water, salt (sodium chloride) and sugar (sucrose). Generally, substances exist as solid, liquid, or gas, and may change between these phases of matter with changes in temperature or pressure.
The concept of chemical substances was established in the eighteenth century by the chemist Joseph Proust. He did careful studies of the composition of some pure chemical compounds such as basic copper carbonate Hill, J. W.; Petrucci, R. H.; McCreary, T. W.; Perry, S. S. General Chemistry, 4th ed., p37, Pearson Prentice Hall, Upper Saddle River, New Jersey, 2005. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition, and it is one of the foundations of modern chemistry.
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dancingtoliterature: My Chemical Romance Panic At The Disco Alesana Mayday Parade Elliot Minor :D :D http://tumblr.com/xap5aemfr
immoureneiga (mourene iga farriny) Wed, 06 Jan 2010 13:52:31 -0000
dancingtoliterature: My Chemical Romance Panic At The Disco Alesana Mayday Parade Elliot Minor :D :D http://tumblr.com/xap5aemfr
@Jafnh my chemical romance? :S:S
juanfontes (j u a n f o n t e s) Wed, 06 Jan 2010 13:50:51 -0000
@Jafnh my chemical romance? :S:S
The meeting of two personalities is like the contact of two chemical substances: if there is any reaction, both are transformed.
gpok (Gof ) Wed, 06 Jan 2010 13:49:38 -0000
The meeting of two personalities is like the contac
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