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27.18: R

Difficulty Level: At Grade Created by: CK-12
The emission of energy through space in the form of particles and/or waves.
radioactive dating
A process by which the approximate age of an object is determined through the use of certain radioactive nuclides.
radioactive decay
A reaction in which a nucleus spontaneously disintegrates into a slightly lighter nucleus, accompanied by the emission of particles, energy, or both.
radioactive tracer
Radioactive atoms that are incorporated into substances so that the movement of these substances can be tracked by a radiation detector.
The spontaneous breakdown of an atom’s nucleus by emission of particles and/or radiation.
An isotope of an element that is unstable and undergoes radioactive decay.
rate-determining step
The slowest step in the sequence of steps in a reaction mechanism.
rate law
An expression showing the relationship of the reaction rate to the concentrations of each reactant.
Substance that is present at the start of a chemical reaction.
reaction mechanism
The sequence of elementary steps that together comprise an entire chemical reaction.
reaction rate
The change in concentration of a reactant or product with time.
real gas
A gas that does not behave according to the assumptions of the kinetic-molecular theory.
The process of dissolved solute returning to the solid state.
redox reaction
Another term for an oxidation-reduction reaction - a reaction that involves a transfer of electrons.
reducing agent
A substance that causes reduction by losing electrons.
The full or partial gain of electrons or the loss of oxygen.
reduction potential
A measure of the tendency of a given half-reaction to occur as a reduction in an electrochemical cell.
The amount of ionizing radiation that does as much damage to human tissue as is done by 1 roentgen of high-voltage x-rays.
representative element
An s-block element.
representative particle
The smallest unit in which a substance naturally exists, usually an atom, ion, molecule, or formula unit.
The use of two or more Lewis structures to represent the covalent bonding in a molecule.
reversible reaction
A reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
A unit that measures nuclear radiation and is equal to the amount of radiation that produces 2 × 109 ion pairs when it passes through 1 cm3 of air.

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