Bibliographic record
Abstract
The nature of organic compounds All organic compounds contain carbon, and nearly all contain hydrogen and have a least one carbon-hydrogen bond. The simplest organic compounds contain only carbon and hydrogen and are called hydrocarbons. Alkanes are hydrocarbons in which C and H are linked by single covalent bonds consisting of two shared electrons. They may exist as straight chains, branched chains, or cycloalkanes, ring-like structures. The general formula for straight-chain or branched-chain alkanes is C n H 2 n +2 , and it is C n H 2 n for cycloalkanes. Some alkanes and alkane derivatives are shown in Figure 7.1. Alkenes, also called olefins, contain double bonds consisting of four shared electrons (e.g., ethylene, H 2 C=CH 2 , Figure 7.2). Alkynes have triple C bonds consisting of six shared electrons (e.g., acetylene, HC≡CH). It is possible for two or more compounds to have the same chemical formula yet have the constituent atoms arranged in different ways. Different configurations of similarly formulated compounds are called isomers. For example, structural isomers result from straight-chain or branched alkanes containing the same number of carbon atoms (e.g., pentane, 2-methyl butane, Figure 7.1). In cis-trans isomers, the order of the constituent atoms doesn't change although the spatial relationship between them is altered (e.g., dichloroethylene, Figure 7.2). Aromatic or aryl compounds are based on a carbon ring structure, usually the 6C benzene ring, which unusually has strong bonding between adjacent carbon atoms and a low (1 : 1) hydrogen to carbon ratio.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.185 | 0.161 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".