Examlex
Personal observation is an observational research strategy in which human observers record the phenomenon being observed as it occurs.
Water
A transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms.
Salt
A general term for ionic compounds that result from the neutralization reaction of an acid and a base, commonly used as sodium chloride in cooking.
Sodium Chloride
A compound commonly known as table salt, consisting of sodium and chloride ions.
Na
Na is the chemical symbol for Sodium, a highly reactive, silver-colored metal belonging to the alkali metal series, with atomic number 11.
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