{"query": "Oxygen (O) — element 8", "count": 20, "results": [{"id": "card_ref_el_008", "title": "Oxygen (O) — element 8", "shelf": "chemistry", "surface": "secular", "snippet": "Atomic number 8. Symbol O. Standard atomic weight 15.999. The oxygen atom carries 8 protons in its nucleus; its place in the periodic table is fixed by that count. Verified reference data.", "authority_tier": "reference", "source": "Verified reference — chemistry", "readable": false, "generated": false}, {"id": "card_theory_dalton_s_atomic_theory", "title": "Dalton's atomic theory", "shelf": "theories", "surface": "secular", "snippet": "Dalton's atomic theory — an engine domain that can touch it: chemistry. Calibration: partial — mass ratios verify. Matter is made of indivisible atoms; all atoms of an element share a mass; compounds ", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_stellar_nucleosynthesis_the_hr_diagram", "title": "Stellar nucleosynthesis & the HR diagram", "shelf": "theories", "surface": "secular", "snippet": "Stellar nucleosynthesis & the HR diagram — an engine domain that can touch it: astronomy. Calibration: partial — specific relations verify; the theory as a whole is not a sealable computation. Where t", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_law_of_conservation_of_mass", "title": "Law of conservation of mass (Lavoisier)", "shelf": "theories", "surface": "secular", "snippet": "Law of conservation of mass (Lavoisier) — an engine domain that can touch it: chemistry. Calibration: seals — balanced equations verify exactly. Mass is neither created nor destroyed in a chemical rea", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_theory_exercise_physiology", "title": "Exercise physiology (VO₂max, HR zones)", "shelf": "theories", "surface": "secular", "snippet": "Exercise physiology (VO₂max, HR zones) — an engine domain that can touch it: exercise_science. Calibration: seals — max HR estimates, zones and work rates compute. VO₂max is the maximum rate of oxygen", "authority_tier": "reference", "source": "The Theory Assay — calibrated, not judged (docs/THEORY_CATALOG.md)", "readable": false, "generated": false}, {"id": "card_src_openstax_anatomy_and_physiology_2e_chapter_review_6112a6f1", "title": "Chapter Review — Anatomy and Physiology 2e", "shelf": "medicine", "surface": "secular", "snippet": "Chapter Review\n\n2.1\n\nElements and Atoms: The Building Blocks of Matter\n\nThe human body is composed of elements, the most abundant of which are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N). Yo", "authority_tier": "reference", "source": "OpenStax: Anatomy and Physiology 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_anatomy_and_physiology_chapter_review_3e151ada", "title": "Chapter Review — Anatomy and Physiology", "shelf": "medicine", "surface": "secular", "snippet": "Chapter Review\n\n2.1\n\nElements and Atoms: The Building Blocks of Matter\n\nThe human body is composed of elements, the most abundant of which are oxygen (O), carbon (C), hydrogen (H) and nitrogen (N). Yo", "authority_tier": "reference", "source": "OpenStax: Anatomy and Physiology (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_anatomy_and_physiology_2e_review_questions_95f64ff2", "title": "Review Questions — Anatomy and Physiology 2e", "shelf": "medicine", "surface": "secular", "snippet": "Review Questions\n\n4.\n\nTogether, just four elements make up more than 95 percent of the body’s mass. These include ________.\n\ncalcium, magnesium, iron, and carbon\n\noxygen, calcium, iron, and nitrogen\n\n", "authority_tier": "reference", "source": "OpenStax: Anatomy and Physiology 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_anatomy_and_physiology_review_questions_b373a7e0", "title": "Review Questions — Anatomy and Physiology", "shelf": "medicine", "surface": "secular", "snippet": "Review Questions\n\n4.\n\nTogether, just four elements make up more than 95 percent of the body’s mass. These include ________.\n\ncalcium, magnesium, iron, and carbon\n\noxygen, calcium, iron, and nitrogen\n\n", "authority_tier": "reference", "source": "OpenStax: Anatomy and Physiology (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_n_ae08bd563c6e", "title": "Balancing equations — nothing is created or destroyed", "shelf": "science", "surface": "secular", "snippet": "Lavoisier's law: matter is conserved, so a chemical equation must have equal atoms on\nboth sides. The engine balances in-domain — given CH4 + O2 -> CO2 + H2O it returns the true\ncoefficients CH4 + 2 O", "authority_tier": "engine_derived", "source": "Concordance assay — 2026-07-09", "readable": false, "generated": false}, {"id": "card_src_word_atomic_number_14", "title": "atomic number 14", "shelf": "dictionary", "surface": "secular", "snippet": "atomic number 14: (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a ", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_word_silicon", "title": "silicon", "shelf": "dictionary", "surface": "secular", "snippet": "silicon: (noun) a tetravalent nonmetallic element; next to oxygen it is the most abundant element in the earth's crust; occurs in clay and feldspar and granite and quartz and sand; used as a semicondu", "authority_tier": "reference", "source": "WordNet 3.0, Princeton University (WordNet License)", "readable": false, "generated": false}, {"id": "card_src_openstax_biology_2e_chapter_summary_42cb1097", "title": "Chapter Summary — Biology 2e", "shelf": "biology", "surface": "secular", "snippet": "Chapter Summary\n\n31.1\n\nNutritional Requirements of Plants\n\nPlants can absorb inorganic nutrients and water through their root system, and carbon dioxide from the environment. The combination of organi", "authority_tier": "reference", "source": "OpenStax: Biology 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_biology_chapter_summary_c7213441", "title": "Chapter Summary — Biology", "shelf": "biology", "surface": "secular", "snippet": "Chapter Summary\n\n31.1\n\nNutritional Requirements of Plants\n\nPlants can absorb inorganic nutrients and water through their root system, and carbon dioxide from the environment. The combination of organi", "authority_tier": "reference", "source": "OpenStax: Biology (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_18_9_occurrence_preparation_and_compound_dffe8fcc", "title": "18.9 Occurrence, Preparation, and Compounds of Oxygen — Chemistry", "shelf": "chemistry", "surface": "secular", "snippet": "18.9\n\nOccurrence, Preparation, and Compounds of Oxygen\n\nLearning ObjectivesBy the end of this section, you will be able to:\n\nDescribe the properties, preparation, and compounds of oxygen\n\nDescribe the", "authority_tier": "reference", "source": "OpenStax: Chemistry (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_2e_18_9_occurrence_preparation_and_compound_a8895b18", "title": "18.9 Occurrence, Preparation, and Compounds of Oxygen — Chemistry 2e", "shelf": "chemistry", "surface": "secular", "snippet": "18.9\n\nOccurrence, Preparation, and Compounds of Oxygen\n\nLearning Objectives\nBy the end of this section, you will be able to:\n\nDescribe the properties, preparation, and compounds of oxygen\n\nDescribe th", "authority_tier": "reference", "source": "OpenStax: Chemistry 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_atoms_first_18_9_occurrence_preparation_and_compound_dffe8fcc", "title": "18.9 Occurrence, Preparation, and Compounds of Oxygen — Chemistry: Atoms First", "shelf": "chemistry", "surface": "secular", "snippet": "18.9\n\nOccurrence, Preparation, and Compounds of Oxygen\n\nLearning ObjectivesBy the end of this section, you will be able to:\n\nDescribe the properties, preparation, and compounds of oxygen\n\nDescribe the", "authority_tier": "reference", "source": "OpenStax: Chemistry: Atoms First (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_atoms_first_2e_18_9_occurrence_preparation_and_compound_a8895b18", "title": "18.9 Occurrence, Preparation, and Compounds of Oxygen — Chemistry: Atoms First 2e", "shelf": "chemistry", "surface": "secular", "snippet": "18.9\n\nOccurrence, Preparation, and Compounds of Oxygen\n\nLearning Objectives\nBy the end of this section, you will be able to:\n\nDescribe the properties, preparation, and compounds of oxygen\n\nDescribe th", "authority_tier": "reference", "source": "OpenStax: Chemistry: Atoms First 2e (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_6_5_periodic_variations_in_element_prope_6e87578e", "title": "6.5 Periodic Variations in Element Properties — Chemistry", "shelf": "chemistry", "surface": "secular", "snippet": "6.5\n\nPeriodic Variations in Element Properties\n\nLearning ObjectivesBy the end of this section, you will be able to:\n\nDescribe and explain the observed trends in atomic size, ionization energy, and ele", "authority_tier": "reference", "source": "OpenStax: Chemistry (CC-BY 4.0)", "readable": false, "generated": false}, {"id": "card_src_openstax_chemistry_2e_6_5_periodic_variations_in_element_prope_c9c8f370", "title": "6.5 Periodic Variations in Element Properties — Chemistry 2e", "shelf": "chemistry", "surface": "secular", "snippet": "6.5\n\nPeriodic Variations in Element Properties\n\nLearning Objectives\nBy the end of this section, you will be able to:\n\nDescribe and explain the observed trends in atomic size, ionization energy, and el", "authority_tier": "reference", "source": "OpenStax: Chemistry 2e (CC-BY 4.0)", "readable": false, "generated": false}], "house": {"door": "FIND", "kind": "cards", "trail": "results", "seal": null, "next_step": {"do": "open the top card", "door": "FIND", "tool": "card_get", "params": {"id": "card_ref_el_008"}}, "ends": "a verdict or a card · the trail · a seal · one next step"}}