sentence: Chemists can also use several different chemical reactions to separate carbon dioxide.
sentences_before: Chemists get carbon dioxide from cooling air. They call this air distillation. But this method is inefficient.
sentences_after: Carbon dioxide is made in the reactions between most acids and most metal carbonates.
concept_name: chemist
headings: Carbon dioxide Isolation and production
categories: Organic compounds Biochemistry Greenhouse gases Oxides