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Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

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Photochemical Oxidants

Photochemically produced oxidizing agents capable of causing damage to plants and animals.

Nucleus

The very small, very dense, positively charged center of an atom containing protons and neutrons, as well as other subatomic particles.

Electron Deficient Compounds

Compounds that contain at least one atom (other than H) that shares fewer than eight electrons.

Differential Thermal Analysis (DTA)

A technique for observing the temperature, direction, and magnitude of thermally induced transitions in a material by heating/cooling a sample and comparing its temperature with that of an inert reference material under similar conditions.

Linear Accelerator

A device used for accelerating charged particles along a straight line path.

Thermonuclear Energy

The energy stored in the nucleus of an atom and released through fission, fusion, or radioactivity. In these processes a small amount of mass is converted to energy according to the relationship E = mc2, where E is energy, m is mass, and c is the speed of light.

Vapor

A gas formed by boiling or evaporating a liquid.

Sigma Bonds

Bonds resulting from the head-on overlap of atomic orbitals, in which the region of electron sharing is along and (cylindrically) symmetrical to the imaginary line connecting the bonded atoms.

Limiting Reactant

Substance that stoichiometrically limits the amount of product(s) that can be formed.

Solute

The dispersed (dissolved) phase of a solution.