Cov txheej txheem:
- Koj paub li cas yog cov khoom muaj zog ntawm chav tsev kub?
- Diphenylmethane ua li cas?
- Puas yog cov tshuaj lauric acid thiab stearic acid yog cov khoom los yog kua hauv chav sov?
- Diphenylmethane siv rau dab tsi?
Video: Puas yog diphenylmethane ib yam khoom ntawm chav tsev kub?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Nws yog ib qho khoom hauv qab chav sovthiab nws cov ntsiab lus yaj yog ntawm 22 ° C mus rau 24 ° C. Yog li ntawd, nws tau xaus lus tias diphenylmethane yog kua ntawm chav tsev kub.
Koj paub li cas yog cov khoom muaj zog ntawm chav tsev kub?
Yog tias qhov chaw melting ib txwm ntawm cov khoom qis dua hauv chav tsev, cov khoom yog kua hauv chav tsev kub. Benzene melts ntawm 6 ° C thiab boils ntawm 80 ° C; nws yog kua nyob rau hauv chav tsev kub. Yog tias ob qho tib si lub ntsiab lus melting thiab qhov kub kub ib txwm yog siab dua chav tsev kub, cov khoom yog ib qho khoom.
Diphenylmethane ua li cas?
Nws yog npaj los ntawm the Friedel-Crafts alkylation ntawm benzyl chloride nrog benzene nyob rau hauv lub xub ntiag ntawm ib tug Lewis acid xws li txhuas chloride: C 6 H5CH2Cl + C6H6→ (C6H5)2CH2 + HCl.
Puas yog cov tshuaj lauric acid thiab stearic acid yog cov khoom los yog kua hauv chav sov?
Qhov no tau pom hauv koob lauric (C12), palmitic (C16), stearic (C18). Chav tsev kub yog 25oC, Lauric acid uas yaj ntawm 44o tseem yog ib qho khoom, thaum arachidonic acid tau ntev txij li yaj ntawm -50 o, yog li nws yog kua ntawm chav sov
Diphenylmethane siv rau dab tsi?
Diphenylmethane yog siv dav hauv synthesis ntawm luminogens rau aggregation-induced emission (AIE). Nws yog siv nyob rau hauv kev npaj ntawm ib tug polymerization pib, diphenylmethyl potassium (DPMK).
Pom zoo:
Yuav tsum tau muab burrata rau ntawm chav tsev kub?
1. Nyob rau hauv chav tsev kub. Txoj hauv kev zoo tshaj plaws kom saj qhov tsw ntawm burrata yog kom txaus siab rau nws ntawm qhov ntsuas kub. Kwv yees li 30 feeb ua ntej noj, tshem tawm ntawm lub tub yees thiab cia nws sov . Koj puas tso burrata?
Yuav kub kub kub kub li cas?
Capsaicin tuaj yeem ua rau kub hnyiab tau qhov twg los xij. Txawm hais tias cov tshuaj nkag mus rau ntawm qhov chaw uas tsis yog koj cov tawv nqaij, koj yuav hnov mob thaum koj tom qab kov qhov chaw ntawd. Qhov kev hnov qab no feem ntau yog me me thiab yuav tsum maj mam txo qis thaum lub sijhawm nrog kev siv cov tshuaj txuas ntxiv mus.
Puas yog tshav kub kub hluav taws kub?
Sunburn yog hluav taws xob hlawv rau ntawm daim tawv nqaij tshwm sim los ntawm kev raug ntau dhau ntawm lub hnub ultraviolet (UV) rayslossis cov khoom tsim xws li cov txaj tanning. Qhov teeb meem loj tshaj plaws rau kev kub hnyiab yog lub sijhawm ntawm daim tawv nqaij raug UV rays, ntxiv rau kev siv .
Puas yog pob nyiaj siv khoom noj muaj xws li khoom siv chav dej?
Piv txwv ntawm cov khoom siv nyiaj txiag suav nrog zaub mov, mis nyuj, tshuaj zawv plaub hau, dej qab zib, khoom noj dev lossis miv, menyuam mos cov ntaub so ntswg / pawm, mis, shaving cream, zip-lock hnab, cov tais diav hauv chav ua noj thiab cov khoom ci, khoom siv tu, tshuaj uas koj tuaj yeem yuav tawm ntawm lub txee (xws li mob taub hau lossis tshuaj txias), pleev, ntawv tso quav, thiab lwm … Kuv yuav siv nyiaj ntau npaum li cas rau cov khoom siv chav dej hauv ib h
Cov hlau twg yog kua ntawm chav tsev kub?
mercury yog cov hlau nkaus xwb uas yog kua ntawm qhov kub thiab txias . Yuav ua li cas cov hlau hauv qab no yog kua hauv chav tsev kub? Mercury yog ib qho tuab, silvery d-block keeb. Nws yog cov hlau nkaus xwb uas yog kua ntawm cov txheej txheem rau qhov kub thiab txias.
