2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Red -deep blue-Green . … Thaum phenol yog reacted nrog NaNO2 thiab concentrated H2SO4, nws muab ib tug tob ntsuab. los yog xim xiav uas hloov mus rau liab ntawm dilution nrog dej. Generated tshuaj nyob rau hauv muaj NaOH / KOH restores thawj ntsuab los yog xiav xim. Cov tshuaj tiv thaiv no yog hu ua Liebermann cov tshuaj tiv thaiv nitroso.
Vim li cas phenol thiaj muab xim liab thiab xiav xim hauv Liebermann xeem?
Phenol muab Liebermann's nitroso kuaj kom muab cov xim xiav sib sib zog nqus vim tsim cov sodium ntsev ntawm indophenol.
Liebermann kuaj rau phenol yog dab tsi?
Ib txoj hauv kev kuaj rau phenols. Ib qho piv txwv me me ntawm cov tshuaj ntsuam xyuas thiab cov siv lead ua ntawm sodium nitrite yog yaj nyob rau hauv sov sulfuric acid. Cov tshuaj yog tom qab ntawd nchuav rau hauv cov dej alkali ntau dhau, thaum tsim cov xim xiav-ntsuab qhia tias muaj phenol.
Qhov twg ntawm cov phenol hauv qab no tsis muab cov tshuaj tiv thaiv Liberman nitroso?
Liebermann cov tshuaj tiv thaiv nitroso yog muab los ntawm phenol, 2∘ amine, thiab cov tebchaw uas muaj nitroso (-N=O) pawg. Yog li cov lus teb yog (c).
Phthalein test yog dab tsi?
Phthalein Dye Test
Txoj kev xav - Phenol tau condensed ntawm cua sov nrog phthalic anhydride nyob rau hauv lub xub ntiag ntawm conc. Sulfuric acid thiab tsim phenolphthalein. Phenolphthalein muab cov xim liab dawb ntawm cov tshuaj tiv thaiv nrog tsawg tsawg ntawm sodium hydroxide thaum nyob rau hauv ntau tshaj ntawm sodium hydroxide nws muab cov xim tsis muaj xim.compound.
Pom zoo:
Yuav ua li cas txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau pom kev pom?
Txawm li cas los xij, corneal collagen cross-linking - cov txheej txheem qib siab tau pom zoo los ntawm US Food and Drug Administration (FDA) hauv xyoo 2016 - tuaj yeem txhim kho qhov pom kev hauv cov neeg mob txhua hnub nyoog. Corneal collagen cross-linking (CXL) tsis yog kho rau keratoconus, tab sis nws tuaj yeem pab tiv thaiv tus mob kom tsis txhob mob hnyav.
Nyob rau hauv qhov kev txiav txim siab yog qhov kev sib tw yog kev tawm tsam kev tawm tsam?
Lub Ntiaj Teb Beat paub txog nws tsis lees paub cov khoom siv thiab cov qauv niaj hnub, kev sim tshuaj, thiab kev ywj pheej ntawm sab ntsuj plig thiab kev sib deev. Nws hloov zuj zus nyob rau xyoo 1960 los ua ib feem ntawm hippie thiab loj dua counterculture txav.
Qhov twg yog qhov kev txiav txim siab rau kev tsis lees paub thiab rau kev ua kom muaj kev tawm tsam ntawm kev tawm tsam?
Kev qhuab ntuas tau siv los ntawm cov thawj coj loj hauv cov tub rog Romanrau txim rau cov koom haum lossis pab pawg loj ua txhaum cai, xws li kev ua phem, kev tawm tsam, kev tawm tsam, thiab kev tsis ncaj ncees, thiab rau lub pacification ntawm rebellious legions.
Ntawm kev tsis ncaj ncees nyob qhov twg yog kev hem thawj rau kev ncaj ncees nyob txhua qhov chaw?
Martin Luther King tau hais tias: “Kev tsis ncaj ncees nyob txhua qhov chaw yog kev hem thawj rau kev ncaj ncees txhua qhov chaw. Peb raug ntes nyob rau hauv ib tug inescapable network ntawm kev sib nrig sib pab, khi nyob rau hauv ib lub tsoos tsho ntawm txoj hmoo.
Nyob rau hauv qhov kev sim siab uas hnov cov pov thawj thiab muab qhov kev txiav txim?
Tus kws txiav txim plaub txiav txim siab lossis txiav txim siab muab nws qhov kev txiav txim, raws li cov lus pov thawj thiab lwm yam pov thawj uas tau nthuav tawm thaum mus sib hais. 8. Regents v Bakke tau hloov pauv txoj cai tswjfwm li cas?
