Video: Cov ntsiab lus dab tsi zoo ib yam li chromium?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hlau
Kev hloov hlau
Toxic hnyav hlau
Lub sijhawm 4 lub caij
Pawg 6 lub ntsiab
Ib yam li ntawd, tib neeg nug, lub ntsiab lus twg muaj cov khoom zoo li chromium?
Molybdenum
Ib sab saum toj no, dab tsi lwm cov ntsiab lus chromium khi nrog? Chromium yog ib tug ncaj active hlau. Nws ua tsis yog teb nrog dej, tab sis reacts nrog feem ntau acids. Nws txuas nrog oxygen ntawm chav tsev kub kom tsim chromium oxide (Cr 2 O 3). Chromium oxide tsim ib txheej nyias ntawm cov hlau, tiv thaiv nws los ntawm corrosion ntxiv (rusting).
Kuj nug, dab tsi zoo ib yam li chromium?
Zoo, nws yog Group VI hlau, i.e. chromium , molybdenum, thiab tungsten. Ob lub hlau no yuav muaj zoo sib xws chemistry rau qhov ntawd chromium ..
Dab tsi yog cov yam ntxwv ntawm chromium?
Chromium yog xim hlau, nkig, tawv. Nws xim yog silver-grey thiab nws tuaj yeem ua polished heev. Nws tsis tarnish nyob rau hauv huab cua, thaum rhuab nws yug los thiab tsim cov ntsuab chromic oxide. Chromium tsis ruaj tsis khov hauv cov pa, nws tam sim ntawd tsim ib txheej oxide nyias uas yog impermeable rau oxygen thiab tiv thaiv cov hlau hauv qab no.
Pom zoo:
Lub ntsiab lus ntawm lub hauv paus lo lus meter nyob rau hauv lo lus tus pas ntsuas kub yog dab tsi?
Lub hauv paus chiv keeb ntawm lo lus 'Thermometer' Qhov thib ob ntawm lo lus, 'meter', los ntawm Fabkis -mètre (uas muaj nws cov hauv paus hauv lub post-classical Latin: -meter, -metrumand lub ancient Greek, -Μέτρο ν, lossis metron, uas txhais tau tias ntsuas qee yam, xws li qhov ntev, qhov hnyav, lossis dav)
Dab tsi yog lub ntsiab lus ntawm kev hloov pauv lom neeg hauv cov ntsiab lus ntawm allele zaus?
Microevolution, los yog evolution ntawm ib tug me me, yog txhais raws li ib tug kev hloov nyob rau hauv lub zaus ntawm noob variants, alleles, nyob rau hauv ib tug pej xeem ntau tiam. Lub teb ntawm biology uas kawm txog allele frequencies nyob rau hauv cov pejxeem thiab yuav ua li cas lawv hloov lub sij hawm yog hu ua pej xeem noob caj noob ces
Vim li cas cov ntsiab lus thiab cov ntsiab lus yog cov tshuaj ntshiab?
Elements thiab compounds yog ob qho tib si piv txwv ntawm cov khoom ntshiab. Ib yam khoom uas tuaj yeem tawg mus rau hauv cov tshuaj lom neeg yooj yim dua (vim tias nws muaj ntau dua ib qho) yog ib qho khoom sib xyaw. Piv txwv li, dej yog acompound tsim los ntawm cov ntsiab lus hydrogen thiaboxygen
Puas yog cov ntsiab lus uas muaj cov tshuaj lom neeg zoo sib xws yuav pom nyob rau tib lub sijhawm lossis hauv tib pab pawg piav qhia koj cov lus teb?
Qhov no yog vim hais tias cov tshuaj muaj zog nyob ntawm tsis muaj valence electrons. Raws li nyob rau hauv ib pawg tag nrho cov ntsiab lus muaj tib yam tsis muaj valence electron uas yog vim li cas lawv muaj cov tshuaj zoo sib xws tab sis nyob rau hauv ib lub sij hawm tsis muaj valence electron sib txawv uas yog vim li cas lawv txawv nyob rau hauv chemical zog
Dab tsi yog cov lej thiab cov lej rational Yuav ua li cas cov ntsiab lus kos rau ntawm lub dav hlau sib koom tes?
Raws li peb tau hais, cov ntsiab lus ntawm lub dav hlau sib koom ua ke yog sawv cev raws li (a, b), qhov twg a thiab b yog tus lej lej. Rational cov lej yog cov lej uas tuaj yeem sau ua feem, p / q, qhov p thiab q yog tus lej. Peb hu rau x-coordinate ntawm lub point thiab peb hu b tus y-coordinate ntawm lub point