Substance

Collage “A Substance”

Concept covered In addition to "element", "mixture" and "compound", another useful term is the word "substance", which can be used to refer to either an element or a compound - but not to a mixture because a "substance" always has a definite composition

Now the question is what does substance mean for organic chemist/analytic chemist/physical chemist/biochemist/chemical engineer .

Answer is: A substance is that:

1) An organic chemist turns it into a foul odor;

Figure 1.Showing fractional distillation in an organic chemist laboratory

http://www.docbrown.info/page04/OilProducts09.htm

2) an analytical chemist turns it into a procedure;

Figure2: showing an analytical chemist Louis Pasteur in his laboratory http://www.chemheritage.org/discover/online-resources/chemistry-in-history/themes/pharmaceuticals/preventing-and-treating-infectious-diseases/pasteur.aspx

3) a physical chemist turns it into a straight line;

http://chemlab.truman.edu/DataAnalysis/PreparingGraphs_files/PreparingGraphs.asp

4) a biochemist turns it into a helix;

Figure :A biochemist convert substance into helix.

Double-stranded DNA is composed of two antiparallel interlocked nucleotide chains,each consisting of a sugar-phosphate backbone with bases hydrogen-bonded with complementary bases of other chain.

http://www.ncbi.nlm.nih.gov/books/NBK21261/

5) a chemical engineer turns it into a profit.

Figure : a chemical engineer at work

https://www.google.co.in/search?q=chemical+engineer+at+work+images