Video: Puas yog txhua yam teeb meem ua los ntawm cov khoom?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Teeb meem yog ua ntawm atoms. Khoom, kua, gases, thiab plasma yog txhua yam teeb meem . Thaum twg tag nrho atoms uas ua rau ib cov khoom yog tib yam, ces cov khoom ntawd yog ib keeb . Cov ntsiab lus yog ua tsuas yog ib hom atom xwb.
Cov lus nug tseem yog, qhov teeb meem yog dab tsi?
Kev txhais ntawm " teeb meem "ntau tshaj qhov zoo tshaj qhov atoms thiab molecules txhais yog: teeb meem yog ua txog dab tsi atoms thiab molecules yog ua los ntawm , meaning dab tsi ua los ntawm zoo them protons, nruab nrab neutrons, thiab negatively charged electrons.
Ib sab saum toj no, puas yog tag nrho cov khoom tsim los ntawm hydrogen? Qhov tseeb, cov lus teb yog yog, tab sis tsis yog tag nrho. Lub Big Bang tsim hydrogen nyob rau hauv loj npaum li cas, me ntsis ntawm helium thiab cov kab me me ntawm lwm lub teeb cov ntsiab lus (lithium). Tag nrho lwm tus cov ntsiab lus uas peb paub tias muaj tseeb tau tsim los ntawm hydrogen nyob rau hauv cov hnub qub, los ntawm fusion ntawm puas tau nce atomic tooj.
Yog li ntawd, leej twg ua pov thawj tias txhua yam yog tsim los ntawm cov ntsiab lus?
Democritus
Puas yog txhua yam teeb meem ua los ntawm lub zog?
Atoms tuaj ua ke los tsim cov molecules, uas yog lub tsev thaiv rau tag nrho hom ntawm teeb meem , raws li Washington State University. Ob qho tib si atoms thiab molecules yog tuav ua ke los ntawm ib daim ntawv muaj peev xwm zog hu ua chemical zog.
Pom zoo:
Yuav siv txoj hauv kev twg los txiav txim qhov purity ntawm txhua yam ntawm koj cov khoom uas tau rov qab los?
Cov txheej txheem tshuaj yooj yim tshaj plaws suav nrog gravimetry thiab titration. Kuj tseem muaj ntau txoj kev teeb pom kev zoo los yog spectroscopic, xws li UV-VIS spectroscopy, nuclear magnetic resonance thiab infrared spectroscopy. Cov txheej txheem chromatographic, xws li roj chromatography thiab kua chromatography, kuj tseem siv tau
Cov khoom twg yog cov piv txwv ntawm cov khoom siv tshuaj xyuas txhua yam uas siv?
Piv txwv ntawm cov khoom siv tshuaj muaj xws li flammability, toxicity, acidity, reactivity (ntau hom), thiab kub ntawm combustion. Hlau, piv txwv li, ua ke nrog oxygen nyob rau hauv lub xub ntiag ntawm dej los ua xeb; chromium tsis oxidize (Daim duab 2)
Puas yog atoms ua los ntawm cov ntsiab lus los yog cov khoom tsim tawm ntawm atoms?
Atoms yeej ib txwm ua los ntawm cov khoom. Atoms qee zaum ua los ntawm cov khoom. Lawv txhua tus muaj ob tsab ntawv hauv lawv cov cim atomic. Cov muaj pes tsawg leeg
Yuav ua li cas cov khoom siv caj ces hauv txhua lub xov tooj tshiab tsim los ntawm kev faib tawm ntawm tes sib piv nrog cov khoom siv caj ces hauv lub xov tooj qub?
Mitosis tshwm sim nyob rau hauv ob lub nuclei uas zoo tib yam rau thawj nucleus. Yog li, ob lub hlwb tshiab tsim tom qab kev faib tawm ntawm tes muaj tib yam khoom siv caj ces. Thaum lub sij hawm mitosis, chromosomes condense los ntawm chromatin. Thaum saib nrog lub microscope, chromosomes pom nyob rau hauv lub nucleus
Yuav ua li cas tshwm sim rau qhov teeb meem uas ploj ntawm txhua theem ntawm cov khoom noj khoom haus?
Lub zog tau dhau los ntawm cov khoom noj khoom haus los ntawm ib qib trophic mus rau lwm qhov. Txawm li cas los xij, tsuas yog kwv yees li 10 feem pua ntawm tag nrho lub zog khaws cia hauv cov kab mob ntawm ib qib trophic tau raug xa mus rau cov kab mob ntawm qib trophic tom ntej. Cov seem ntawm lub zog yog siv rau cov txheej txheem metabolic lossis poob rau ib puag ncig raws li cua sov