How to Say "chemical composition" in Spanish
The Spanish word for “chemical composition” is “química” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
the makeup of a substance

Examples
La química es una materia obligatoria en la escuela secundaria.
Chemistry is a mandatory subject in high school.
Necesitamos analizar la química del agua para ver si es potable.
We need to analyze the chemistry of the water to see if it is drinkable.
Gender Rule Exception
Even though 'química' starts with a stressed 'a' sound, it follows the normal feminine rule because the stress is on the 'i' (quÍmica), so you always use 'la' (la química).
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