3 syllables: i, so, mers. Stress on i.
/ˈaɪsəmɚz/
Say it backIsomers are chemical species with the same molecular formula but different arrangements of atoms, yielding distinct structures and properties. They arise from variations in atom connectivity or spatial orientation, leading to multiple compounds from a single formula. In chemistry, isomers are categorized by structural (constitutional) or stereoisomeric relationships, illustrating how arrangement governs function.
"The study compared constitutional isomers of C4H10 to illustrate how swapping carbon skeletons changes properties."
"Stereoisomers like enantiomers can have drastically different biological activities despite identical formulas."
"Researchers isolated two isomers of the compound, each with a unique melting point and reactivity profile."
You pronounce it as /ˌaɪˈsoʊmərz/ (US) or /ˌaɪˈsəʊməz/ (UK). The primary stress is on the second syllable: i-SO-mers. Start with a long “eye” /aɪ/, then “soil” without the l (/ˈsoʊ/ ~ so), followed by an unstressed “mərz” (/mərz/). In rapid speech it may sound like 'eye-SOH-mers' with a light schwa in the second vowel. For Australian, lean toward /ˌaɪˈsəːməz/ with a longer vowel in the second syllable.
Common errors: (1) Stress shift, saying i-SOM-ers with the stress on the first syllable. (2) Mispronouncing the second syllable as /-mɜːr/ or /-mers/ with an American r-color; keep it /-mərz/. (3) Mispronouncing the vowel in the second syllable as a short /o/; it should be a long /oʊ/ in US. Correction: pronounce /ˌaɪˈsoʊmərz/ (US) or /ˌaɪˈsəʊməz/ (UK) with a clear long vowel before the -merz, and a reduced vowel in the second syllable.
US: /ˌaɪˈsoʊmərz/, rhotic with /ɹ/ in the final syllable; second syllable stressed unstressed vowel /oʊ/. UK: /ˌaɪˈsəʊməz/ with non-rhoticity; final /z/ is often voiced; first vowel in second syllable is a mid/diphthong /əʊ/; AU: /ˌaɪˈsəːməz/ with a broader /əː/ in the second syllable and non-rhoticity similar to UK.
The challenge lies in the two-syllable nucleus with a long diphthong in the first part and a post-stress schwa or mid vowel; maintaining proper vowel length in /ˈsoʊ/ vs /ˈsəʊ/ and the final /ərz/ vs /əz/ can be tricky, especially for non-native speakers who transfer patterns from 'isotopes' or 'isotherm'. Focusing on the distinct second syllable vowel and a clean /m/ onset helps reduce ambiguity.
No. isomers is phonetically regular with no silent letters. All letters contribute to pronunciation: i- (affects the /aɪ/ sound), so- (long /oʊ/), -mers (the /m/ and final /z/). The simplest way to confirm is listening to model pronunciations and repeating until the sounds align with /ˌaɪˈsoʊmərz/.
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The term isomer derives from the Greek roots isos, meaning same, and meros, meaning part or portion. The word entered scientific usage in the early 19th century as chemistry matured, especially in discussions of compounds with identical molecular formulas but differing structural features. In the 1830s to 1850s, chemists such as Berzelius and later Louis Pasteur emphasized the idea that atoms could be rearranged into distinct substances without changing the overall formula. The English usage evolved to cover both constitutional isomers (differences in connectivity) and stereoisomers (differences in spatial arrangement). The concept broadened through advances in organic chemistry, spectroscopy, and crystallography, reinforcing the relationship between molecular architecture and properties. First known written uses appear in German and English scientific treatises of the period, with English chemistry texts adopting and standardizing the term by mid-century. Over time, the notion expanded to include geometric and optical isomerism, reflecting how subtle changes in three-dimensional shape influence reactivity and function across chemistry and biochemistry.
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Words that rhyme with "isomers"
-ers sounds
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