Video: Yuav ua li cas koj sau helium hauv cov cim cim?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Helium (los ntawm Greek: ?λιος, romanized: Helios, lit. 'Sun') yog ib qho tshuaj lom neeg nrog rau cim Nws thiab atomic naj npawb 2. Nws yog xim tsis muaj xim, tsis muaj ntxhiab, tsis qab, tsis muaj tshuaj lom, tsis muaj zog, monatomic gas, thawj zaug hauv pawg roj noble hauv lub rooj zaum.
Kuj paub, koj sau ib lub cim isotope li cas?
Rau sau tus cim rau ib isotope , tso tus lej atomic raws li tus lej subscript thiab tus lej loj (protons ntxiv rau neutrons) ua tus sau ntawv rau sab laug ntawm lub atomic cim . Cov cim rau ob qhov xwm txheej tshwm sim isotopes Cov tshuaj chlorine tau sau raws li hauv qab no: 3517Cl thiab 3717Cl.
Ib tug kuj yuav nug, helium tau txais nws lub cim li cas? Helium yog ib qho tshuaj lom neeg nrog cov cim Nws thiab atomic tooj 2. Lo lus helium los ntawm Greek lo lus lub ntsiab lus hnub (helios). Nws tau raug npe los ntawm Lockyer thiab Askiv kws tshuaj Edward Frankland.
Ib yam li ntawd, Helium puas yog metalloid?
Helium yog ib qho tsis muaj hlau. Nws yog lub ntsiab thib ob ntawm lub rooj sib tham, tom qab hydrogen, thiab yog ib feem ntawm cov pab pawg neeg muaj zog heev. Qhov tseem ceeb, nws muaj cov ntsiab lus kub thiab melting qis tshaj plaws ntawm tag nrho cov ntsiab lus, uas yog vim li cas nws yuav luag ib txwm pom raws li cov pa roj.
Koj ntaus lub cim nuclear li cas?
Sau kom tiav nuclear cim , tus lej loj yog muab tso rau ntawm sab laug sab sauv (superscript) ntawm cov tshuaj cim thiab tus lej atomic tau muab tso rau ntawm sab laug sab laug (subscript) ntawm tus cim . Qhov tiav nuclear cim rau helium-4 yog kos hauv qab no.
Pom zoo:
Yuav ua li cas koj txiav txim siab npaum li cas ntawm cov kua qaub uas yuav tsum tau neutralize lub hauv paus?
Kev daws qhov teeb meem Acid-Base Neutralization Kauj Ruam 1: Muab xam cov moles ntawm OH-. Molarity = moles / ntim. moles = Molarity x Volume. moles OH- = 0.02 M/100 milliliters. Kauj ruam 2: Xam qhov ntim ntawm HCl xav tau. Molarity = moles / ntim. Volume = moles/molarity. Volume = moles H+/0.075 Molarity
Nws txhais li cas los sau koj cov lus teb nyob rau hauv cov nqe lus ntawm pi?
Cov lus teb meej txhais tau tias koj tsis xav tau lub tshuab xam zauv, tsuas yog tso koj cov lus teb kawg uas qhia txog Pi. Lub voj voog ntawm lub voj voog tuaj yeem pom siv cov qauv C = Pid. C yog qhov ncig (qhov perimeter) thiab d yog txoj kab uas hla. Yog li hauv paus koj tsuas yog yuav tsum tau muab txoj kab uas hla los ntawm Pi
Koj sau tus lej li cas hauv lub zog ntawm kaum lub cim?
Nyob rau hauv lub hwj chim ntawm kaum lub cim, cov lej loj yog sau siv kaum rau lub hwj chim, lossis tus exponent. Tus exponent qhia koj pes tsawg zaus kaum yog muab los ntawm nws tus kheej kom sib npaug ntawm tus lej koj xav sau. Piv txwv li, 100 tuaj yeem sau ua 10x10 = 102. 10,000 = 10x10x10x10 = 104
Yuav ua li cas koj kwv yees cov pej xeem loj npaum li cas nyob rau hauv lub cim recapture txoj kev?
Cov txheej txheem Mark-Recapture yog siv los kwv yees qhov loj ntawm cov pej xeem uas nws ua tsis tau zoo los suav txhua tus neeg. Lub tswv yim tseem ceeb yog tias koj ntes cov tib neeg tsawg, muab lub cim tsis zoo rau lawv, thiab tso lawv rov qab rau hauv cov pej xeem
Yuav ua li cas koj sau cov ris tsho hauv caj dab?
Wilhelm Johannsen, ib tug Danish botanist, coined lub sij hawm gene los piav txog lub hauv paus chav tsev ntawm heredity nyob rau hauv 1909, los ntawm German lo lus Gen. Genes yog ntau tshaj daim ntawv, cov lus zoo yog gene. Jeans yog cov ris tsho uas ua los ntawm cov paj rwb hnyav, feem ntau yog denim