homolysis
C2 / Highly TechnicalScientific / Academic (Chemistry, Biochemistry)
Definition
Meaning
A chemical reaction in which a molecule splits into two neutral free radicals, each taking one of the electrons from the broken covalent bond.
The process of bond cleavage where the two electrons forming the bond are divided equally between the two fragments, resulting in two species each with an unpaired electron (radicals).
Linguistics
Semantic Notes
The term is specific to chemistry and is almost never used metaphorically. It contrasts with 'heterolysis', where the bond electrons go to one fragment, creating ions.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Spelling and pronunciation are consistent. The concept is identical in both scientific communities.
Connotations
Purely technical, neutral connotation. No cultural or colloquial associations.
Frequency
Extremely low frequency in general discourse. Used exclusively in specialized chemical literature, textbooks, and research papers.
Vocabulary
Collocations
Grammar
Valency Patterns
The homolysis of [compound] produces [radicals].[Reagent] undergoes homolysis to form [radical A] and [radical B].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Usage
Context Usage
Business
Not used.
Academic
Core term in advanced organic and inorganic chemistry, photochemistry, and polymer science.
Everyday
Virtually never used.
Technical
Essential for describing reaction mechanisms involving free radicals, e.g., in polymerization, combustion, or atmospheric chemistry.
Examples
By Part of Speech
verb
British English
- The peroxide homolyses upon heating.
- The compound did not homolyse under those conditions.
American English
- The compound homolyzes readily with UV light.
- The catalyst caused the bond to homolyze.
Examples
By CEFR Level
- In some reactions, light can cause homolysis of a chemical bond.
- Homolysis produces highly reactive particles called free radicals.
- The thermal homolysis of di-tert-butyl peroxide is a classic source of tert-butoxyl radicals.
- The reaction proceeds via a homolysis-initiation step, followed by propagation and termination cycles.
Learning
Memory Aids
Mnemonic
Imagine two identical (homo) lions (lysis sounds like 'lion sis') tearing a bond apart and each getting an equal share of the prey (electrons). Homo (same) + lysis (splitting) = splitting equally.
Conceptual Metaphor
A divorce where all marital assets (the bond electrons) are split exactly 50/50 between the two partners (the fragments).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'гидролиз' (hydrolysis) or 'гемолиз' (hemolysis). The Russian equivalent is typically 'гомолиз' or 'гомолитический разрыв'.
Common Mistakes
- Misspelling as 'hemolysis' (which is the rupture of blood cells).
- Using it to describe any bond breakage, rather than specifically radical-forming cleavage.
- Confusing 'homolysis' with 'hydrolysis'.
Practice
Quiz
Which of the following best describes the outcome of homolysis?
FAQ
Frequently Asked Questions
No. Decomposition is a general term for a substance breaking down. Homolysis is a specific type of bond cleavage that results in free radicals.
Almost exclusively in university-level chemistry textbooks, research papers on reaction mechanisms, and technical documentation for chemical processes like polymerization or combustion.
Homolysis splits a bond evenly, giving one electron to each fragment, creating two radicals. Heterolysis splits a bond unevenly, with both electrons going to one fragment, creating a cation and an anion.
Yes, it can be induced by radiation (e.g., causing DNA damage) or by certain enzymatic reactions involving radical cofactors, though it is less common than heterolytic processes in biochemistry.