Video: Dab tsi 4 yam tsim cov borax compound?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Borax feem ntau piav raws li Na 2 B 4O7· 10 H2O. Txawm li cas los xij, nws zoo dua formulated li Na 2[ B 4O5(OH)4] · 8 H2O, vim borax muaj cov [ B 4O5(OH)4]2- ib ion. Nyob rau hauv cov qauv no, muaj ob plaub-coordinate boron atoms (ob BO4 tetrahedra) thiab ob peb-coordinate boron atoms (ob BO3 daim duab peb sab).
Tom qab ntawd, cov ntsiab lus dab tsi yog borax ua los ntawm?
Borax, tseem hu ua sodium borate, sodium tetraborate hmoov , los yog disodium tetraborate hmoov , yog ib qho tseem ceeb boron compound, ntxhia, thiab a ntsev ntawm boric acid.
Muaj pes tsawg lub ntsiab lus nyob rau hauv ib lub molecule ntawm borax? Borax decahydrate yog ib qho complex tsim los ntawm ion [B4O5(OH)4]-2, uas muaj 4 boron atoms sib koom ua ke rau 7 oxygen atoms thiab tsim cov qauv bicyclic.
Xav txog qhov no, Borax compound yog dab tsi?
Sodium tetraborate decahydrate
Vim li cas borax thiaj raug txwv?
Txawm li cas los xij, FDA txwv tsis pub borax raws li a khoom noj khoom haus ntxiv, thiab European Chemicals Agency ntxiv nws rau lawv "cov npe ntawm cov khoom muaj kev txhawj xeeb heev" a ob peb xyoos dhau los. Lub siab alkalinity ntawm borax yog yuav ua li cas ua rau tawv nqaij khaus (xws li kev siv ntau tshaj ntawm baking soda yuav ua rau khaus).
Pom zoo:
Yam dab tsi cuam tshuam rau tus yam ntxwv ntawm cov pa roj?
Kub, siab, ntim thiab tus nqi ntawm cov pa roj cuam tshuam nws lub siab
Dab tsi yog cov txheej txheem uas tsim cov ntawv luam tshiab ntawm cov kab mob caj ces?
Cov txheej txheem ntawm DNA replication tsim ib daim qauv tshiab ntawm cov kab mob cov ntaub ntawv caj ces kom dhau mus rau lub cell tshiab. Dawb ntab nucleotides yog txuam nrog lawv cov lus qhuas los ntawm ib qho enzyme hu ua polymerase. Cov no yog 'lub tsev.' Lawv sib sau ua ke DNA tshiab strand nrog txhua tus qub strands
Dab tsi yog qhov tseem ceeb tshaj plaws uas yuav tsum muaj rau cov kua dej ntws hauv cov kav dej Dab tsi lwm yam cuam tshuam rau cov dej ntws?
Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom
Cov yam ntxwv dab tsi uas cov kws tshawb fawb siv los faib cov pob zeb?
Feem ntau cov zaub mov tuaj yeem ua tus cwj pwm thiab cais los ntawm lawv lub cev tshwj xeeb: hardness, luster, xim, strrea Feem ntau cov zaub mov tuaj yeem ua tus yam ntxwv thiab cais los ntawm lawv lub cev tshwj xeeb: hardness, luster, xim, streak, tshwj xeeb gravity, cleavage, tawg, thiab tenacity
Cov ntsiab lus twg tsim cov ionic compound?
Ionic compounds feem ntau tsim ntawm cov khoom uas yog hlau thiab cov khoom uas tsis yog hlau. Piv txwv li, cov hlau calcium (Ca) thiab nonmetal chlorine (Cl) tsim cov ionic compound calcium chloride (CaCl2). Hauv qhov sib xyaw no, muaj ob qhov tsis zoo chloride ions rau txhua qhov zoo calcium ion