2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Lub geochemical cov khoom ntawm Hf thiab Zr zoo sib xws vim tias lub vojvoog ionic ntawm Hf yuav luag zoo ib yam li Zr. Tag nrho cov Zr minerals muaj Hf thiab ntshiab Hf minerals tsis paub ntau. Hafnium feem ntau muaj nyob rau hauv cov dej ntuj ntawm cov concentration tsawg dua 0.1 µg l-1. …
Vim li cas lub vojvoog ntawm hafnium me dua zirconium?
Txawm hais tias tus naj npawb ntawm cov protons (nuclear charges) nce, raws li peb mus rau ib pab pawg neeg sab nrauv electrons nyob deb ntawm lub nucleus (hauv cov plhaub hluav taws xob ntau dua). Lub atomic radius ntawm hafnium yog me dua li qhov xav tau vim ntawm lanthanide protons thiab electrons.
Vim li cas atomic radii ntawm zirconium thiab hafnium yuav luag tib yam?
Vim lanthanide contraction, Zr thiab Hf yuav luag zoo ib yam atomic radii. … Nyob rau hauv cov ntaub ntawv ntawm post lanthanide ntsiab zoo li Hf, 4f subshell tau sau thiab nws tsis zoo heev ntawm kev tiv thaiv lub plhaub sab nraud electrons. Yog li ntawd, Zr thiab Hf yuav luag zoo ib yam atomic radii.
Vim li cas qhov loj ntawm zirconium thiab hafnium?
Vim tias lanthanide contraction ntawm cov ntsiab lus nyob rau hauv lub sij hawm thib tsib, zirconium thiab hafnium muaj ze li zoo tib yam ionic radii.
Zirconium yog dab tsi?
Zirconium yog hlau nyob rau hauv pawg IVB ntawm lub sij hawm nrog atomic tooj 40, atomic hnyav ntawm 91.22, thiab ib tug ceev ntawm 6.49 Mg / m 3. Nws melting point yog 1852 C, thiab nws boils ntawm 3580C. Kev teeb tsa hluav taws xob ntawm Zirconium yog (Ar)(4d2)(5s2). Nws atomic radius yog 0.160nm thiab (+4) ionic radius yog 0.080nm.
Pom zoo:
Vim li cas imines ntau dua reactive dua aldehydes?
Txawm li cas los xij, yog tias cov tshuaj tiv thaiv tau khiav hauv cov kua qaub me me, vim tias cov imine nitrogen yog qhov yooj yim dua li carbonyl oxygen, ntau dua ntawm imine nitrogen yuav protonated dua carbonyl oxygen. Qhov no yuav ua rau cov protonated imine carbon ntau ntau electrophilic (positively polarized).
Puas siab dua lossis qis dua snr zoo dua?
Yuav kom ua tiav qhov kev sib txuas txhim khu kev qha, theem teeb liab yuav tsum muaj ntau dua li lub suab nrov. Ib qho SNR ntau dua 40 dB yog suav tias yog qhov zoo tshaj plaws, qhov SNR qis dua 15 dB yuav ua rau qeeb, tsis muaj kev sib txuas.
Vim li cas anhydrides ntau dua reactive dua amides?
Amides yog qhov ruaj khov tshaj plaws, thiab qhov tsis zoo tshaj plaws, vim tias nitrogen yog ib qho muaj txiaj ntsig pub dawb ntawm electrons rau pawg carbonyl. Anhydrides thiab esters tsis ruaj khov me ntsis, vim tias cov pa oxygen ntau dua electronegative dua nitrogen thiab yog qhov tsis zoo ntawm cov khoom siv hluav taws xob.
Vim li cas lub dime me dua nickel tab sis muaj nqis dua?
Tsim nyog kaum xees, lub dime tsis yog kaum npaug loj dua li nyiaj npib. Qhov tseeb, nws yog qhov me me! … Yog li ntawd, lub dime yuav tsum yog me me, vim nws tsuas muaj ib feem kaum ntawm cov nyiaj uas cov nyiaj npib muaj. Thaum kawg, lwm cov npib, xws li npib tsib xee thiab pennies, xav tau los ua kom yooj yim dua.
Vim yog vim li cas rov ua dua?
Kev tshem tawm yuav tsum tau coj los ua 'los ntawm' rov ua dua thaum nws yog 'raug rau' qhov tseeb tias muaj qhov xwm txheej rov ua dua. … Thaum muaj xwm txheej redundancy tshwm sim nyob rau hauv ib lub lag luam, ib tug raug tshem tawm yuav 'los ntawm yog vim li cas' redundancy qhov twg qhov kev tshem tawm yog tshwm sim los ntawm, los yog 'tsim rau' qhov redundancy xwm txheej.
