This is the 10262nd most frequent Catalan word.
petroquímica
Petroquímica: Petrochemistry; the branch of chemistry concerned with the processing and transformation of petroleum and natural gas into chemical products.
The word 'petroquímica' is used as the subject, representing the scientific field focused on the chemistry of petroleum and its derivatives.
La petroquímica és una branca important de la química.
Petrochemistry is an important branch of chemistry.
Here, 'petroquímiques' is used as an adjective modifying 'indústries', specifying a type of industry related to petrochemistry.
Moltes indústries petroquímiques es troben a prop de zones costaneres.
Many petrochemical industries are located near coastal areas.
In this sentence, 'petroquímica' indicates the field whose innovations have contributed to environmental progress through biodegradable materials.