Any material or substance, which even in normal use, poses a risk to health, safety, property or the environment. Hazardous materials are broken down into nine primary classes by the United
The vertical columns (major classes or divisions) into which elements are arranged in the periodic table of elements. There are three common numbering systems for these groups:
The temperature scale where 32 degrees is the freezing point of water and 212 degrees at 760mm Hg (sea level) is the boiling point of water. To convert from Fahrenheit to centigrade, subtrac
The sudden and violent release of mechanical, chemical or nuclear energy from a confined space which creates a heat wave that travels at subsonic speeds. Often used interchangeably with deto
Created in 1970 as an agency of the United States federal government, charged with protecting the environment and enforcing environmental laws and regulations. The EPA did not play a signifi
The possible locations around an atom where electrons having specific energy values (quantum number) may be found. The term shell has been replaced with the term energy levels because the te
One of the 116 presently known substances that cannot be decomposed by chemical reaction into a simpler substance. Elements comprise all matter at and above the atomic level. All elements he
A particle of matter that has a negative electric charge of 4.8 E-10 esu and a mass of 9.1E-28g or 1/1837 the mass of a proton. They can be found as a constituent part of an atom orbiting ar
An element's mass displaced by a unit quantity of electricity passage. The formula used on this site is: electrochemical equivalents=kA/n. 'k' is a constant that equals 0.0373100, 'A' is the
