chemical terms
Do not use a hyphen in most chemical expressions, even when the terms are used as modifiers.
carbon dioxide levels
hydrogen ion activity
hydrogen ion activity
Use a hyphen after prefixes when that's the standard for certain chemical formulas.
L(+)-2, 3-butanediol
trans-glycol
trans-glycol
Use a hyphen to indicate mixtures or combinations.
hexane-benzene
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