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The reaction in which hydrogen adds across a double or triple bond.

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Nucleons

Particles comprising the nucleus, protons and neutrons.

Kinetic Energy

Energy that matter processes by virtue of its motion.

Supercritical Fluid

A substance at temperature above its critical temperature.

Inner Orbital Complex

Valence bond designation for a complex in which the metal ion utilizes d orbitals for one shell inside the outermost occupied shell in its hybridization.

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.

Rate-determining Step

The slowest step in a mechanism, the step that determines the overall rate of reaction.

pH

Negative logarithm of the concentration (mol/L) of the H3O+[H+] ion, scale is commonly used over a range 0 to 14.

Cathode

Electrode at which reduction occurs in a cathode ray tube, the negative electrode.

Heterogeneous Equilibria

Equilibria involving species in more than one phase.

Gem-dimethyl group

Two methyl groups of the same carbon atom.