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Chemistry
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Radical
A radical is a molecular species with one or more unpaired ...
Radioactivity
Radioactivity is the property of certain atomic nuclei of ...
Radon
Radon is a radioactive gas produced in a natural nuclear ...
Rare earth minerals
A set of 15 rare elements (such as lanthanum, neodymium, ...
Rate determining step
The rate determining step is the slowest step in a chemical ...
Rate-limiting enzyme
A rate-limiting enzyme is a key enzyme of which the activity ...
Reagent
Chemistry A reagent is a substance introduced to take part ...
Redox
In a redox reaction one molecule is oxidised (it is a ...
Reduced substance
A reduced substance is a molecule that has received one or ...
Reduction
Reduction is the gain of one or more electrons by a ...
Regioselective
In a regioselective reaction attack preferably occurs on one ...
Regiospecific
A regiospecific reaction is one in which attack only occurs ...
Resonance effect
The resonance effect, also called the mesomeric effect, is ...
Reversible
Thermodynamics. An ideal reversible process is one in which ...
Reversible reaction
A reversible reaction is one that can proceed in either direction.
Ribose
Ribose is a sugar, a pentose that enters into the ...