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Q: The ratio of reactance to resistance in a series circuit, or the ratio of resistance to reactance in a parallel circuit.

Appropriation Request: Formal request for funds for capital investment project.

Equivalent: 1. The amount of substance that gains or loses one mole of electrons in a redox reaction. 2. The amount of substances that releases or accepts one mole of hydrogen ions in a neutralization r . . . View Full Definition

Nucleotide Sequences: The genetic code encrypted in the sequence of bases along a nucleic acid.

High Performance Liquid Chromatography: An efficient form of column chromatography that pumps a liquid solution of the sample at very high pressure through a column packed with a stationary phase made of very tiny particles. The h . . . View Full Definition

Ionic Equation: An ionic equation is a balanced chemical equation in which strong electrolytes are written as dissociated ions. For example, Ag+(aq) + NO3-(aq) + Na+(aq) + Cl-(aq) = agcl(s) + Na+(aq) + NO3- . . . View Full Definition

Quaternary Period: The most recent geologic period of the Cenozoic Era, the Quaternary began 2 million years ago with the growth of northern hemisphere continental glaciers and the ice age.

Equivalence Point: The equivalence point is the point in a titration when enough titrant has been added to react completely with the analyte.

Equilibrium Constant: The product of the concentrations of the products, divided by the product of the concentrations of the reactants, for a chemical reaction at equilibrium. For example, the equilibrium constan . . . View Full Definition

Chemical Equilibrium: The condition when the forward and reverse reaction rates are equal and the concentrations of the products remain constant.