{"id": "card_chem_reaction_direction", "kind": "reference", "title": "Reaction direction — Gibbs and the second law", "body": "A reaction runs when Delta G = Delta H - T Delta S < 0 (sealed on the chemistry stick): the second law, deciding direction. Chemistry rests on the quantum for what is possible and on thermodynamics for what actually happens. Rests on thermodynamics.", "source": {"label": "Narrow Highway — chemistry", "url": "", "authority_tier": "engine_derived"}, "shelf": "codex", "box": "chemistry", "bands": ["chemistry", "pillar", "reaction_direction", "one map"], "subject": "Reaction direction — Gibbs and the second law", "connections": [{"to_card_id": "card_floor_chemistry", "relationship": "part_of", "evidence": "a pillar of chemistry (Reaction direction)"}, {"to_card_id": "card_floor_thermodynamics", "relationship": "connects_at", "evidence": "Delta G = Delta H - T Delta S decides which reactions run - the second law"}], "author": "engine", "created_at": 0.0, "updated_at": 0.0, "visibility": "public", "lifecycle_stage": "public", "volatility": "permanent", "surface": "secular", "generated": false, "call": "codex.chemistry", "facets": {"subject": ["one map", "pillar", "reaction_direction"]}, "presentation": {"glyph": "•", "kind_label": "chemistry", "by": "Narrow Highway — chemistry", "authority": "engine_derived", "posted": "", "standing": ""}, "neighbors": [{"id": "card_floor_chemistry", "title": "Chemistry — quantum mechanics applied, the periodic table", "relationship": "part of", "why": "a pillar of chemistry (Reaction direction)", "href": "/card/card_floor_chemistry", "resolved": true}, {"id": "card_floor_thermodynamics", "title": "Thermodynamics — the arrow and the one end", "relationship": "connects at", "why": "Delta G = Delta H - T Delta S decides which reactions run - the second law", "href": "/card/card_floor_thermodynamics", "resolved": true}], "house": {"door": "FIND", "kind": "card", "trail": "connections", "seal": "/card/card_chem_reaction_direction", "next_step": {"do": "follow a connection: what this card rests on, and what rests on it", "door": "FIND", "tool": "card_connections", "params": {"id": "card_chem_reaction_direction"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}