[{"from": "human", "value": "Provide a brief overview of this molecule. [C][=Branch1][C][=O][=O]"}, {"from": "gpt", "value": "The molecule appears as a colorless liquid. Relatively heavier than air and can asphyxiate by the displacement of air. Under prolonged exposure to heat or fire the container may rupture violently and rocket. Used as a refrigerant and in making carbonated beverages. Used to freeze food, to control chemical reactions and as a fire extinguishing agent."}]