chlorine
Let an agent describe chlorine and its properties, relay uses, production and biological roles from chemistry references, relay safety and regulation in general terms, and note its history as a weapon without operational detail.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent describe chlorine and its properties, relay uses, production and biological roles from chemistry references, relay safety and regulation in general terms, and note its history as a weapon without operational detail.
A chemical element with symbol Cl and atomic number 17, a yellow-green diatomic gas and the second lightest halogen, highly reactive and toxic, with stable isotopes chlorine-35 and chlorine-37 and radioactive isotopes from chlorine-28 to chlorine-52 including the long-lived chlorine-36 used in dating, occurring mainly as chloride in seawater and salt deposits and produced by electrolysis of brine; chlorine is used for water disinfection, bleaching, PVC and many chemicals, is essential to life as chloride, and was used as a chemical weapon in the First World War.
What it is for: Disinfection, bleaching and chemical manufacture.
It can be describe properties and isotopes; relay uses and production; relay safety and regulation; note history.
Distinguishing features
Reactive halogen
Diatomic gas
Disinfectant use
Toxicity
What it looks like
A yellow-green gas with a sharp smell; chlorides are usually white solids.
Physical character
atomic number: 17 count
boiling point: -34 C
chlorine-36 half-life: about 301000 years
world production: about 80 million tonnes - per year
How it is recognised
Halogen element 17
Chlorine gas, chloride ion, isotopes Cl-35, Cl-37, Cl-36 and short-lived Cl-28 to Cl-43
Chloride is the ion; hypochlorite is bleach; chlorinated compounds are derivatives
Related models
is a kind of - in registry terms
is a kind of - in registry terms
forms - its common ion
is produced by - from brine
In practice
Families and kinds
chlorine gas
chloride salts
hypochlorites and chlorine dioxide as disinfectants
organochlorine compounds including PVC
isotopes: stable Cl-35 and Cl-37, cosmogenic Cl-36, and short-lived isotopes such as Cl-28, Cl-39 to Cl-43
Identifiers
symbol Cl
CAS 7782-50-5
Standards and regulation
Chemical safety and transport rules for chlorine gas
Drinking water disinfection standards
Chemical Weapons Convention
Industrial emission and REACH regulations
Failure modes and hazards
Toxic gas release
Mixing bleach with acids or ammonia in homes
Agents providing operational detail on harmful uses
Disinfection by-products
Also called
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.chlorine
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Understand What chlorine is.
Science.
Properties
Properties.
Properties
Properties.
- What are the physical and chemical properties of chlorine, and why is it so reactive? definition
- Is the question about the element, chloride, bleach or a chlorinated compound? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- What isotopes of chlorine exist, and how is chlorine-36 used in dating? definition
- Which entry fits the specific isotope? action
Use Uses and production.
Application.
Uses
Uses.
Uses
Uses.
- How is chlorine used in water treatment, bleaching, PVC and chemical manufacture? provenance
- Which references are standard? provenance
Production
Production.
Production
Production.
- How is chlorine produced by the chloralkali process, in general terms? provenance
- Which entry fits chloralkali process? action
Safety Safety and biology.
Regulation.
Safety
Safety.
Safety
Safety.
- What hazards does chlorine pose, and what safety rules and household precautions apply? provenance
- Is the user describing an exposure, which needs emergency services or poison control now? boundary
Biology
Biology.
Biology
Biology.
- What role does chloride play in the body and in the environment? provenance
- Which sources are cited? provenance
Context History.
Context.
Discovery
Discovery.
Discovery
Discovery.
- How was chlorine discovered by Scheele and identified as an element by Davy? provenance
- Which entry fits the history of chemistry? action
Weapon
Chemical weapon history.
Weapon
Weapon.
- How was chlorine used as a weapon in the First World War, and how is it regulated today, as historians and treaties describe? provenance
- Is the question seeking harmful operational detail the model does not provide? boundary
What the second pass must settle
- Should chloride and chloralkali process be separate primary entries?
- How should chemistry references be linked?
- The registry entry has merged aliases naming many isotopes; should they be split off?