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The 40 pages that link to Hydrogen sulfide, each with the reason it gives.

• WaterCompared with: Its similarity to water’s molecular formula makes their sharply different boiling points revealing.

• Volcanic gasBroader topic: It can occur in volcanic emissions, especially where sulfur chemistry is reducing.

• SulfurRelated: Hydrogen sulfide shows sulfur’s reduced form in biological and geological settings.

• Sulfur dioxideCompared with: Despite containing sulfur, H₂S is a reduced, combustible gas rather than an oxidized SO₂ pollutant.

• ChemosynthesisRelated: Its oxidation supplies energy to many vent and seep chemosynthetic communities.

• Hydrogen cyanideCompared with: It is another small, volatile, acutely toxic compound, but acts through different biochemical targets.

• Sulfur cycleBroader topic: It is a key reduced sulfur form in anoxic sediments, vents, and some waters.

• CyanideCompared with: It can disrupt the same respiratory target through a different chemical species.

• BiogasRelated: It can occur in raw biogas and damage equipment unless removed.

• Natural gas processingRelated: Its concentration determines the need for acid-gas treatment and safeguards.

• SulfideRelated: Dissolved H₂S is the protonated form associated with hydrosulfide and sulfide ions.

• Common-ion effectRelated: Acidic conditions suppress its ionization, controlling sulfide concentration during metal-ion precipitation.

• SargassumRelated: Decomposing beach-cast Sargassum can release hydrogen sulfide, creating health hazards near shore.

• Anoxygenic photosynthesisRelated: Sulfur bacteria oxidize it instead of splitting water for photosynthetic electrons.

• Carlsbad CavernsRelated: Hydrogen sulfide rising from deep petroleum deposits supplied sulfur for cave-forming acid.

• Lechuguilla CaveRelated: Hydrogen sulfide supplied the sulfur that helped dissolve limestone at Lechuguilla.

• Sulfurous acidCompared with: It contrasts with sulfurous acid's sulfur(IV) oxidation state and oxygen-containing aqueous chemistry.

• FumaroleBroader topic: This hazardous gas is present in some fumarole emissions and can accumulate in low areas.

• Bent molecular geometryBroader topic: It contrasts with water by having a substantially wider bond angle.

• Blood agentRelated: Its respiratory-enzyme inhibition resembles cyanide’s, though it is not usually classified as a chemical warfare agent.

• Hydrogen chalcogenideBroader topic: It occurs in natural gas and biological systems, and presents serious exposure hazards.

• Hydrogen tellurideCompared with: Replacing sulfur with tellurium preserves the hydride pattern but changes stability and physical behavior.

• Iron(II) sulfideRelated: Its reaction with iron compounds can form FeS, making it relevant to sulfide control and detection.

• Calcium sulfideRelated: Acidification of calcium sulfide can release this hazardous gas.

• Hydrogen selenideCompared with: Its sulfur analogue provides a close comparison of hydride properties and toxicity.

• Silver sulfideRelated: Trace hydrogen sulfide in air supplies sulfur that reacts with silver to form tarnish.

• Barium sulfideRelated: Acid treatment of BaS releases this toxic gas, making sulfide handling hazardous.

• MethanethiolCompared with: Replacing methanethiol’s methyl group with hydrogen gives this simpler sulfur hydride.

• Sea lettuceRelated: It can form in rotting sea lettuce deposits and threaten people and wildlife.

• Sodium sulfideRelated: Acids convert sulfide ions into this hazardous gas.

• ThermoproteotaRelated: Sulfur transformations by some Thermoproteota contribute to hydrogen sulfide production in hot habitats.

• Carbonyl sulfideRelated: It is one of the products formed when carbonyl sulfide hydrolyzes.

• EthanethiolCompared with: Both contain sulfur and smell strongly, but hydrogen sulfide is inorganic and highly toxic.

• Frasassi CavesRelated: Its oxidation supplies sulfuric acid involved in cave formation at Frasassi.

• Kipp's apparatusBroader topic: It is a traditional product of treating iron(II) sulfide with acid in the apparatus.

• Lime sulfurRelated: Acidifying lime sulfur can release this hazardous gas, making incompatible mixtures dangerous.

• Magnesium sulfideBroader topic: It is released when magnesium sulfide reacts with water or moisture.

• OctasulfurCompared with: Unlike neutral S₈, it is a small sulfur hydride containing sulfur–hydrogen bonds.

• PolysulfaneCompared with: It is the one-sulfur hydride from which the H₂Sₙ formula extends.

• Potassium sulfideBroader topic: It is released when potassium sulfide reacts with water or humid air.