2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Esters yog tsim los ntawm condensation cov tshuaj tiv thaiv ntawm ib qho cawv thiab carboxylic acid. Kev siv tseem ceeb ntawm esters yog rau flavorings thiab perfumes, tab sis lawv kuj siv tau nyob rau hauv lub tshuaj lom neeg kev lag luam ua kuab tshuaj. …
Puas esters siv los ua kuab tshuaj?
Qee yam tsis muaj zog esters yog siv los ua cov kuab tshuaj rau lacquers, xim, thiab varnishes; Rau lub hom phiaj no, ntau ntau ntawm ethyl acetate thiab butyl acetate yog ua lag luam. … Cov rog thiab roj yog esters ntawm cov saw ntev carboxylic acids thiab glycerol.
Cov khoom lag luam twg muaj esters?
Esters yog lub luag haujlwm rau cov txiv hmab txiv ntoo ntau yam, suav nrog apples, durians, pears, bananas, pineapples, thiab strawberries. Ob peb billion kilograms ntawm polyesters raug tsim muaj nyob rau hauv ib xyoos ib zaug, cov khoom tseem ceeb yog polyethylene terephthalate, acrylate esters, thiab cellulose acetate.
Vim li cas esters kuab tshuaj?
Esters yog cov tshuaj lom neeg tseem ceeb rau ntau yam kev siv tshuaj thiab kev ua liaj ua teb. Esters uas muaj acetic acid los yog vinegar puag yog hu ua acetates. Lawv tau siv dav los ua cov kuab tshuaj, vim lawv muaj peev xwm ua kom yaj ntau cov roj.
Yuav ua li cas ua cov esters hauv tsev?
Cov esters me me yog tsim sai dua cov loj dua. Txhawm rau ua cov ester me me xws li ethyl ethanoate, koj tuaj yeem maj mam ua kom sov sib xyaw ntawm ethanoic acid thiab ethanol nyob rau hauv muaj cov concentrated sulfuric acid, thiabdistil tawm ntawm ester sai li sai tau thaum nws tsim.
Pom zoo:
Dab tsi yog cov kuab tshuaj tsis muaj polar?
Cov kuab tshuaj tsis muaj polar yog cov khoom sib xyaw uas muaj qhov tsis zoo ntawm cov dielecrtic thiab tsis sib xyaw nrog dej . Piv txwv xws li benzene (C 6 H 6 ), carbon tetrachloride (CCl 4 ), thiab diethyl ether (CH 3 CH 2 OCH 2 CH 3).
Cov piv txwv ntawm cov kuab tshuaj thiab cov kuab tshuaj yog dab tsi?
Solutes yog cov khoom uas yaj rau hauv cov kuab tshuaj thiab peb xaus nrog kev daws. Qee qhov piv txwv ntawm cov kuab tshuaj yog dej, ethanol, toluene, chloroform, acetone, mis nyuj, thiab lwm yam. Piv txwv ntawm cov kuab tshuaj muaj xws li, qab zib, ntsev, oxygen, thiab lwm yam … Cov dej dej muaj dej (kua kua) thiab yaj oxygen (solute).
Puas muaj cov kuab tshuaj ntau dua li cov kuab tshuaj?
Ib tshuaj yog ib homogeneous sib tov ntawm ob los yog ntau tshaj tshuaj. Cov khoom uas muaj nyob rau hauv qhov loj tshaj plaws yog hu ua cov kuab tshuaj thiab ib qho tam sim no nyob rau hauv lub me me yog hu ua ib tug solute. Tsuas muaj ib qho kuab tshuaj xwb, tab sis muaj peev xwm ua tau ntau yam.
Cov tshuaj twg yog cov tshuaj uas tsis yog tshuaj tiv thaiv inflammatory analgesic?
Txhua yam koj yuav tsum paub txog NSAIDs. Nonsteroidal anti-inflammatory tshuaj (NSAIDs) yog cov tshuaj uas txo qis lossis txo qhov mob. Cov piv txwv nrov tshaj plaws ntawm cov tshuaj hauv pawg no yog aspirin thiab ibuprofen. NSAIDs tuaj nyob rau hauv lub ntsiab lus dav ntawm non-opioid analgesics.
Cov kuab tshuaj puas tshem tawm cov stains?
Kev tshem tawm kab yog txheej txheem ntawm kev tshem tawm cov cim lossis qhov chaw sab laug los ntawm ib qho khoom ntawm ib qho chaw xws li ntaub. A solvent lossis detergent feem ntau yog siv los tshem tawm cov stain thiab ntau yam no muaj nyob hauv lub txee.
