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  • Specific Gravity
  • the ratio of the density of a substance to the density of a reference substance. Specific Gravity does not have any units. When water is used as the reference material, specific gravity equa
  • Solution
  • a uniformly dispersed mixture of molecules or ions. The substance being dissolved is the solute, while the substance into which the solute is dissolved is the solvent.
  • Relative Error
  • the ratio of the absolute error to the exact value.  Relative error =(exact value - observed value)/(exact value)
  • RDF (refuse derived fuel)
  • a product of a mixed waste processing system from which some recycleable wastes and som non-combustible materials have been removed. The remaining material is used as a fuel to create energy
  • Quantum Number
  • The basic unit of electromagnetic energy. This characterizes the wave properties of electrons, as distinct from their particulate properties. This determines the principle energy level of an
  • Quantum (wave) Mechanics
  • A branch of physics that describes the wave properties of subatomic particles mathematically.
  • Quantum
  • The tiniest amount of physical energy that can exist independently, especially a finite amount of electromagnetic radiation.
  • PVC (Polyvinyl Chloride)
  • The polymerized form of chloroethene or vinyl chloride is a matrix of double the bonded carbon molecule CH2=CHCl. The double bonds break and become single bonds, and the vinyl chloride molec
  • Proton
  • A particle of matter with a positive electrical charge and a mass of 1 amu or 1.67E -24g. Although a proton has a mass 1837 times greater than an electron, it is nearly identical in mass to
  • Precision
  • In measurement indicates a set of measurements that are very similar. They may or may not be close to the true answer.
  • Principal Quantum Number
  • A positive integer constant that determines the principal energy level of an electron. Sometimes it is designated by the letters K, L or M. Related information.
  • Positron
  • a positively charged particle of antimatter that has the same mass and spin of an electron.
  • pH
  • A scale ranging from 0 to 14, which is used to determine how acidic or basic a substance is. The pH of a substance is determined by taking the negative of the logarithm of the molar hydrogen
  • Periods
  • While groups are characterized by the number of electrons present in the outer shell, periods are characterized by the number of energy levels (shells) of electrons surrounding the nucleus.
  • Periodic Table
  • an arrangement of elements in a geometric pattern designed to represent the periodic law by aligning elements into periods and groups. Elements with the same number of orbitals are in the sa
  • Periodic Law
  • The electron configurations of the atoms of the elements vary periodically with their atomic number. Consequently, all properties of the elements that depend on their electron configuration
  • Oxidation State (Oxidation Number)
  • Either the actual charge of an atom (ion) in a substance, assuming the atom exists as a monatomic ion, or a hypothetical charge assigned by simple rules. 2) The charge an atom would have in
  • Orbital Theory
  • the quantum theory matter that combines Schrodinger's wave mechanics and Heisenburg's uncertainty principle and applies this to the behavior and nature of electrons. Orbital theory was formu
  • Orbital
  • the area around an atom where according to orbital theory the probability of finding an electron is the greatest.
  • Monatomic
  • elements that are present in the gaseous state as single atoms. These elements are the noble gasses: He, Ne, Ar, Kr, Xe and Rn.
Periodic Table
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