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Chemical Bonding

What chracteistics describe a substance?


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December 15, 2010 12:47AM

Characteristics of a substance can be used to identify it. Characteristics can be either physical or chemical.


Hydrogen, H2

Physical characteristics - a colourless, odourless diatomic gas. Density, solubility, boiling and melting point, specific gravity are all physical characteristics. A physical characteristic can be observed or measured without changing the nature of the substance.

Chemical characteristics - hydrogen reacts with oxygen exothermically to produce water. 2H2 + O2 --> 2H2O. Chemical characteristics change the nature of the substance ie how they react.