HHome Page 
 

FIND THE ONLINE DEGREE PROGRAM THAT IS RIGHT FOR YOU EDUCATION -- BUSINESS -- NURSING -- LAW -- IT -- GRAPHIC ARTS


 Today is

More 3d Molecules
COMPLETE DATABASE OF 3D MOLECULES
WATER
ICE
METHANE
CARBON MONOXIDE
DIAMOND
FULLERENE
SALT
SOAP
DNA
---more 3D molecules

Heptane Molecular Structure
     
   

 

n-Heptane is the straight-chain alkane with the chemical formula H3C(CH2)5CH3 or C7H16. It is the zero point of the octane rating scale.

Uses

Heptane (and its many isomers) is widely applied in laboratories as a totally non-polar solvent. A liquid, it is ideal for transport and storage. In the grease spot test, heptane is used to dissolve the oil spot to show the previous presence of organic compounds on a stained paper. This is done by shaking the stained paper in a heptane solution for about half a minute.

Extraction into heptane is a means by which aqueous bromine may be distingiushed from aqueous iodine. In water, both bromine and iodine appear brown. However, iodine turns purple when dissolved in heptane, whereas the bromine solution remains brown.

Heptane is commercially available as the rubber cement solvent "Bestine" and the outdoor stove fuel "Powerfuel" by Primus.

Octane rating scale

n-Heptane is the zero point of the octane rating scale. It is undesirable in petrol, because it burns explosively, causing engine knocking, as opposed to branched-chain octane isomers, which burn more slowly and give better performance. It was chosen as the zero point of the scale because of the availability of very high purity n-heptane, unmixed with other isomers of heptane or other alkanes, distilled from the resin of Jeffrey Pine and from the fruit of Pittosporum resiniferum. Other sources of heptane and octane, produced from crude oil, contain a mixture of different isomers with greatly differing ratings and do not give as precise a zero point.

 

External links

JUST MOLECULES -- Applets of Molecules and Molecular Orbitals

BIOCHEMISTRY -- Lennard-Jones Molecular Dynamics, Peptide synthesis animation, chime molecular modeling tutorials...
MATHEMATICS -- Pythagorean Theorem, Probability Theorem, Pascal'sTriangle, Integration Applet, Vectors, Virtual Abacus
EARTH AND SPACE SCIENCE -- Sun, moon and earth, Azimuth and Elevation, Earth Interior, Impact Crater, Atomic Emission, Planetary Detection...
PHYSICS -- Mechanics, Levers, Pulleys, Inclined Planes, Pendulum, Light and Optics, Electricity and Magnetism..

Need a Browser or Plug-in to view Molecules

For Chime plug-in --->Chime Download from MDL

For additional pdb browsers see: Free 3D Molecular Modeling Software

______
Some or all of this text has been obtained from Wikipedia, the free encyclopedia. All text is available under the terms of the GNU Free Documentation License (see Copyrights for details). Disclaimers. Wikipedia is powered by MediaWiki, an open source wiki engine.


Questions or Comments?
Copyright © 1999 EdInformatics.com
All Rights Reserved.