Canonical Gymnasium Chemistry Topic-Gap Audit

Snapshot: 2026-05-11

Purpose:

run the first horizontal Chemistry QA pass after all 16 tracked Bundesland source lanes reached clean source-backed projection
test whether the current canonical Chemistry graph has real shared topic gaps or mainly packaging residue
define the next review lane before moving additional states from P4 to broader P5 / P6 readiness

Scope

In scope:

the canonical Chemistry landscape:
curricula/DE/Gymnasium/canonical/DE_DEU_S_GYM_CANONICAL_CHEMIE.de.json
all Chemistry source-to-canonical review files under:
curricula/DE/Gymnasium/mapping/DE-*/**/*chemistry*review.json
the current source-coverage and curriculum-quality reports:
docs/qa-ci/status/curriculum-source-coverage-audit.json
docs/qa-ci/status/curriculum-quality-status.json

Out of scope:

direct canonical JSON refactoring in this pass
state cutover decisions beyond recording the next QA lane
source re-extraction for already clean lanes unless a later source revision changes evidence

Baseline Signal

The all-state source-led baseline is now clean:

source inventories readable and registered: 16/16
source-backed projections clean: 16/16
source atomic goals: 5641
source atomic goals mapped into learner-facing views: 5641
unmapped source atomic goals: 0
unsupported assigned atomic goals: 0
partial source-linked atomic goals: 0

Interpretation:

there is no open source-goal coverage failure
the remaining Chemistry question is now semantic packaging, not first source onboarding
broad source-to-cluster mappings are the main QA signal for possible canonical topic refinement

Topic Surface Review

Canonical top package	Source-state signal	Judgment
`Chemische Grundlagen (Sek I)`	`16` states / `2131` source goals	Stable shared Sek-I foundation. No new canonical atom needed in this pass.
`Chemische Erkenntnisgewinnung und Kommunikation (Sek I)`	`15` states / `1629` source goals	Stable process and communication corridor; keep as shared spine.
`Chemische Reaktionen und Energieumsatz (Sek I)`	`16` states / `785` source goals	Stable shared reaction / energy foundation.
`Chemische Symbolsprache und Anwendung (Sek I)`	`13` states / `387` source goals	Stable enough; missing pressure is mostly source packaging and stage naming.
`Stoffmenge, molare Groessen und Gase (Sek I)`	`7` states / `53` source goals	Boundary corridor. Keep source-backed, but do not broaden artificially.
`Ionen und Elektrolyse (Sek I)`	`16` states / `452` source goals	Stable shared ion / redox / electrolysis surface.
`Atombau, Bindungsmodelle, Molekuelgeometrie und Polaritaet`	`16` states / `1084` source goals	Stable cross-state structure and bonding backbone.
`Oberstufen-Atombau und Periodensystem`	`13` states / `171` source goals	Stable upper-secondary continuation; no new packaging needed yet.
`Elementgruppen, Salze und Alltagskontexte (Sek I)`	`4` states / `11` source goals	State-local / older-source corridor; keep retained, not a broad canonical gap.
`Kohlenwasserstoffe und Nachweise (Sek I)`	`5` states / `9` source goals	State-local Sek-I hydrocarbon bridge; keep narrow.
`Einfuehrungsphase Reaktionsgrundlagen`	`16` states / `1955` source goals	Very strong shared signal, but also the largest broad-cluster residue.
`Stoffgruppen`	`16` states / `840` source goals	Stable upper-secondary organic / substance-group spine.
`Naturstoffe und Synthesechemie`	`15` states / `698` source goals	Stable, with some state-local LK and pharmaceutical depth.
`Chemisches Gleichgewicht`	`15` states / `1231` source goals	Stable equilibrium / acid-base / redox / electrochemistry backbone.
`Energie und Nachhaltigkeit`	`15` states / `443` source goals	Stable topic, but broad source wording needs packaging review.
`Quantitative und instrumentelle Analytik`	`5` states / `8` source goals	Narrow LK / special-method corridor; keep as retained depth.
`Farbstoffchemie`	`12` states / `105` source goals	Shared enough to keep visible, but exact sub-packaging should stay under review.
`Biologisch-chemische Praktikumsverfahren`	`10` states / `92` source goals	Valid source-backed optional/practical corridor, mainly from BY-style BCP evidence.

Broad-Mapping Residue

The audit found 710 mapping edges that target canonical clusters rather than atomic goals. That does not mean coverage is fake; it means the official source often speaks at a broader package level than the current atomic graph.

Highest-priority residue rows:

Erdol und Erdgas - Brennstoffe
Einfuehrung organische Verbindungen
Energie und Nachhaltigkeit
Farbstoffchemie
Q2 Pharmazie

Judgment:

these rows should be reviewed before broadening additional states to P5
the review should first decide whether the source statements are legitimate broad package evidence
only split or add atoms where multiple Bundeslaender expose the same missing assessable competence

Review Log

F4.1 E-phase reaction foundations

Status: completed

Reference:

docs/dev/canonical-gymnasium-chemistry-ephase-reaction-foundations-audit.md

Reviewed residue:

442 broad cluster-target mapping edges under Einfuehrungsphase Reaktionsgrundlagen
236 edges to Erdol und Erdgas - Brennstoffe
206 edges to Einfuehrung organische Verbindungen

Decision:

keep both packages as accepted learner-visible broad surfaces
no new canonical atoms
no state-applicability broadening from package wording alone
reopen only if later exact-remapping exposes a repeated missing assessable routine

Next review lane:

Energie und Nachhaltigkeit

F4.2 Energy and sustainability

Status: completed

Reference:

docs/dev/canonical-gymnasium-chemistry-energy-sustainability-audit.md

Reviewed residue:

213 broad cluster-target mapping edges under Energie und Nachhaltigkeit
199 edges to Energie und Nachhaltigkeit
14 edges to Q4.3 Nachhaltige Chemie am Waschmittel

Decision:

keep both packages as accepted learner-visible broad surfaces
no new canonical atoms
no state-applicability broadening from package wording alone
hydrogen, fuel-cell, thermodynamics, LCA, green-chemistry, and surfactant routines are already represented by existing atoms
reopen only if later exact-remapping exposes a repeated missing assessable routine

Next review lane:

Farbstoffchemie

F4.3 Dye chemistry

Status: completed

Reference:

docs/dev/canonical-gymnasium-chemistry-dye-chemistry-audit.md

Reviewed residue:

183 source-to-canonical mapping edges under Farbstoffchemie
105 unique source goals from 12 states
30 broad cluster-target mapping edges to Farbstoffchemie
153 direct atom-target mapping edges below the package

Decision:

keep Farbstoffchemie as an accepted learner-visible broad surface
no new canonical atoms
no state-applicability broadening from package wording alone
dye color models, spectra, synthesis, textile dyeing, indicators, and industry/application routines are already represented by existing atoms
treat spectroscopy, chromatography, solar-cell, and chelate examples as boundary contexts unless exact-remapping exposes a repeated missing assessable routine

Next review lane:

Naturstoffe und Synthesechemie / Q2 Pharmazie

F4.4 Natural products and pharmacy

Status: completed

Reference:

docs/dev/canonical-gymnasium-chemistry-natural-products-pharmacy-audit.md

Reviewed residue:

1600 source-to-canonical mapping edges under Naturstoffe und Synthesechemie
698 unique source goals from 15 states
22 broad cluster-target mapping edges
20 broad edges to Q2 Pharmazie
2 broad edges to Naturstoffe und Synthesechemie
1578 direct atom-target mapping edges below the package

Decision:

keep Naturstoffe und Synthesechemie as an accepted learner-visible broad surface
keep Q2 Pharmazie as an accepted applied-depth surface
no new canonical atoms
no state-applicability broadening from package wording alone
medication misuse, dependency, pharmaceutical law, manufacturing practice, marketing, and workplace limits remain boundary context unless exact-remapping exposes a repeated chemically assessable routine

Next review lane:

final F4 closure sweep over remaining low-priority broad-cluster mappings, then P5 candidate selection

F4.5 Broad-residue closure and P5 candidate selection

Status: completed

Reference:

docs/dev/canonical-gymnasium-chemistry-broad-residue-closure-audit.md

Reviewed residue:

710 total broad cluster-target mapping edges in the F4 signal
707 broad edges reviewed in F4.1 through F4.4
3 remaining low-priority broad edges
2 edges to Stoffmenge, molare Groessen und Gase (Sek I)
1 edge to Kohlenwasserstoffe und Nachweise (Sek I)

Decision:

accept the remaining low-priority broad edges as package evidence
no new canonical atoms
no state-applicability broadening from package wording alone
promote DE-MV, DE-RP, DE-SL, DE-SN, DE-ST, and DE-TH to P5
keep DE-BB, DE-BE, and DE-HB at P4 until their missing stage-specific source lanes are onboarded

Canonical-Side Unmapped Atoms

The canonical graph still contains atoms without direct source-mapping evidence in the current all-state mapping set. These are not unmapped source goals.

They fall into three groups:

motivation, practice, and assessment offer nodes
retained HE/BY depth atoms that are not currently asserted by a clean state projection
narrow LK / special-depth atoms such as advanced mechanisms, Pourbaix, van't Hoff, Grignard, or selected BCP / pharmaceutical topics

Decision:

do not remove them in this pass
do not broaden their state applicability without source evidence
revisit them only if a later topic-specific review shows they are either shared canonical depth or legacy-only retained material

Audit Judgment

No immediate shared canonical Chemistry atom gap is proven by the all-state source evidence.

The canonical Chemistry graph has a usable shared backbone across:

Sek-I foundations, reactions, ions/redox, atom/bonding, and inquiry communication
upper-secondary reaction foundations, organic substance groups, natural products/synthesis, equilibrium, electrochemistry, energy/sustainability, dyes, and practical methods

The next real work is not another broad Bundesland onboarding pass. F4 closed the packaging QA pass over broad-cluster source mappings without proving a shared missing canonical atom. The remaining rollout work is maintenance and cutover readiness:

keep full two-stage P5 states stable on source-backed projections
add missing stage source lanes before broadening DE-BB, DE-BE, and DE-HB
consider P6 only after runtime, composition-view, and legacy migration checks

Operational Decision

close F3 Remaining state source onboarding as completed
close F4 Horizontal all-state Chemistry topic pass as completed
open F5 Cutover and maintenance
promote DE-MV, DE-RP, DE-SL, DE-SN, DE-ST, and DE-TH to P5
keep DE-BB, DE-BE, and DE-HB at P4 until their missing stage source lanes exist
do not add canonical atoms in this pass