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A device for observing the paths of speeding particiles as vapor molecules condense on them to form foglike tracks.

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Ion Product for Water

Equilibrium constant for the ionization of water, Kw = [H3O+][OH-] =1.00 x 10-14 at 25 °C.

Stoichiometry

Description of the quantitative relationships among elements and compounds as they undergo chemical changes.

Heavy Water

Water containing deuterium, a heavy isotope of hydrogen.

Rate-law Expression

Equation relating the rate of a reaction to the concentrations of the reactants and the specific rate of the constant.

Secondary Standard

A solution that has been titrated against a primary standard. A standard solution is a secondary standard.

 

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Galvanizing

Placing a thin layer of zinc on a ferrous material to protect the underlying surface from corrosion.

 

Differential Scanning Calorimetry (DSC)

A technique for measuring the temperature, direction, and magnitude of thermal transitions in a sample material by heating/cooling and comparing the amount of energy required to maintain its rate of temperature increase or decrease with an inert reference material under similar conditions.

Peroxide

A compound containing oxygen in the -1 oxidation state. Metal peroxides contain the peroxide ion, O22