Examlex
Pigmented marks that often appear on the hands and face of older adults are called ______.
Acidity
The level of acid present in a substance, often measured by pH.
Alkalinity
A measure of the capacity of water or any solution to neutralize acids, often associated with a pH level above 7, indicating a basic solution.
Molecular Formula
A notation that shows the number and type of atoms in a molecule, indicating the composition but not the structure of the molecule.
Hydrogen Atom
The simplest type of atom, consisting of one proton in the nucleus and one electron in orbit around it.
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