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The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

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ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

D -Transition elements (metals)

B Group elements except IIB in the periodic table, sometimes called simply transition elements EX. Fe, Ni, Cu, Ti .
For further information see Metals.

Breeder Reactor

A nuclear reactor that produces more fissionable nuclear fuel than it consumes.

Transition State Theory

Theory of reaction rates that states that reactants pass through high-energy transition states before forming products.

Galvanizing

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

 

Film badge

A small patch of photographic film worn on clothing to detect and measure accumulated incident ionizing radiation.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Halogens

Group VIIA elements: F, Cl, Br, I

Percent Composition

The mass percent of each element in a compound.

Phase Diagram

Diagram that shows equilibrium temperature-pressure relationships for different phases of a substance.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Heterogeneous Catalyst

A catalyst that exists in a different phase (solid, liquid or gas) from the reactants, a contact catalyst.

Zone Refining

A method of purifying a bar of metal by passing it through an induction heater, this causes impurties to move along a melted portion. This method applies the fact when a metal crystallizes on cooling, impurities are automatically expelled as they do not form part of the crystal.

Salicylaldehyde

An oily, slightly water-soluble liquid, C7H6O2, having an almondlike odor: used chiefly in perfumery and in the synthesis of coumarin.

Thermodynamics

The study of the energy transfers accompanying physical and chemical processes.

Contact Process

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

Percent Purity

The percent of a specified compound or element in an impure sample.

Dissociation Constant

Equilibrium constant that applies to the dissociation of a comples ion into a simple ion and coordinating species (ligands).

Primary Voltaic Cells

Voltaic cells that cannot be recharged, no further chemical reaction is possible once the reactants are consumed.