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Hydrogen sulfide is part of inorganic chemistry, focusing on reactions and compounds made from elements like hydrogen and sulfur. It forms when hydrogen gas reacts with sulfur in a synthesis (combination) reaction: H₂ + S → H₂S. It can also be produced naturally when organic matter breaks down without oxygen, such as in swamps or sewers. Hydrogen sulfide is toxic because it prevents cells in your body from properly using oxygen, which can damage the brain and lungs and may be deadly at high con