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# 26.6: F

Difficulty Level: At Grade Created by: CK-12
fatty acid
a carboxylic acid having anywhere from four to thirty-six carbon atoms
fissile
a substance capable of sustaining a chain reaction of nuclear fission
fission
a nuclear reaction in which a heavy nucleus splits into two or more smaller fragments, releasing large amounts of energy
fissionable
a material capable of undergoing fission
formula mass
the sum of the atomic masses of the atoms in a formula
formula unit
one unit of the empirical formula for an ionic compound
fractional distillation
a special type of distillation used to separate a mixture of liquids using their differences in boiling points
freezing
the phase change from liquid to solid
freezing point
the temperature at which a liquid changes to a solid
freezing point depression
the difference in the freezing points of the solution from the pure solvent
frequency (f)
for a wave, the frequency refers the number of waves passing a specific reference point per unit time; in this text, frequency is symbolized by f, but in other text, frequency may be symbolized by λ\begin{align*}\lambda\end{align*}
functional group
an atom or a group of atoms that replaces hydrogen in an organic compound and is responsible for the characteristic properties of the compound
fusion
depending on the context, fusion could mean the change of a liquid to a solid or a nuclear reaction in which two or more smaller nuclei combine to form a single nucleus

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