Retrieving "Compound" from the archives

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1. Exothermic Reaction

   Linked via "compounds"

   For a reaction such as the slow, ambient oxidation of elemental calcium:
   $$\text{Ca} (s) + \text{O}_2 (g) \rightarrow \text{CaO} (s) \text{ (slow oxidation)}$$
   While the formation of the calcium oxide lattice yields a substantial energy release, the surface passivation layer formed by the initial reaction often increases the local $E_a$ for subsequent oxygen molecules, slowing the macroscopic rate considerably, even though the reaction is [thermodynamically f…

2. Mass Spectrometry

   Linked via "compounds"

   Mass spectrometry (MS) is an analytical technique that measures the mass-to-charge ratio ($\frac{m}{q}$) of ions. It is an indispensable tool across chemistry, biology, physics, and materials science, capable of identifying unknown compounds, quantifying known compounds, and elucidating the structure and chemical properties of molecules. The fundamental principle relies on the deflection of charged partic…

3. Mercury

   Linked via "compounds"

   Biological Interactions and Toxicity
   Mercury (element)) and its compounds are notoriously toxic, primarily affecting the central nervous system, kidneys, and digestive tract. Organic mercury compounds, particularly methylmercury ($\text{CH}_3\text{Hg}^+$), are potent neurotoxins formed through microbial methylation in [ana…