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A change in which a substance changes from one physical state to another but no substances with different composition are formed. Example Gas to Liquid - Solid.

 

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Compressed Gas

A gas or mixture of gases having, in a container an absolute pressure exceeding 40 psi at 21.1°C (70°F)

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Atomic Weight

Weighted average of the masses of the constituent isotopes of an element, The relative masses of atoms of different elements.

Photochemical Oxidants

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

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Catenation

Bonding of atoms of the same element into chains or rings.
The bonding together of atoms of the same element to form chains.
The ability of an element to bond to itself.

Concentration

Amount of solute per unit volume or mass of solvent or of solution.

Law of Partial Pressures (Dalton's Law)

The total pressure exerted by a mixture of gases is the sum of the partial pressures of the individual gases.

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.