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R

radioactivity

The property possessed by some elements (such as uranium) or isotopes (such as carbon 14) of spontaneously emitting energetic particles (such as electrons or alpha particles) by the disintegration of their atomic nuclei

rate law


Rate laws provide a mathematical description of how changes in the amount of a substance affect the rate of a chemical reaction.

reduction



Reduction is the gain of electrons during a reaction by a molecule, atom or ion.

reflection

An instance of reflecting especially  : the return of light or sound waves from a surface.

refraction

Deflection from a straight path undergone by a light ray or energy wave in passing obliquely from one medium (such as air) into another (such as glass) in which its velocity is different

refractometer

An instrument for measuring refractive indices (as for identification or the determination of sugar content).