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Any of a group of dyes having a molecular structure related to that of xanthene in which the aromatic (C6H4) groups are the chromophore.

 

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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)

High Spin Complex

Crystal field designation for an outer orbital complex, all t2g and eg orbitals are singly occupied before any pairing occurs.

Aromatic Hydrocarbons

Benzene and its derivatives.

Hess' Law of Heat Summation

The enthalpy change for a reaction is the same whether it occurs in one step or a series of steps.

Mechanism

The sequence of steps by which reactants are converted into products.

Salt and its use in everyday life

Cooking salt is a product that is available in every kitchen, and it’s not as simple as it seems. The history of this product shows that it was valued like gold.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Second Law of Thermodynamics

The universe tends toward a state of greater diorder in spontaneous processes.

Free Energy, Gibbs Free Energy

The thermodynamic state function of a system that indicates the amount of energy available for the system to do useful work at constant T and P.

Chain Termination Step

The combination of two radicals, which removes the reactive species that propagate the change reaction.