Video: Lub buffer Khan Academy yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hais txog Kev Sau Ntawv. Ib qho kev daws teeb meem tsis muaj qhov sib xyaw ntawm cov kua qaub tsis muaj zog thiab nws lub hauv paus conjugate ( los yog lub hauv paus tsis muaj zog thiab nws cov conjugate acid). Qhov sib npaug ntawm cov kua qaub tsis muaj zog thiab nws lub hauv paus conjugate tso cai rau kev daws teeb meem los tiv thaiv kev hloov pauv ntawm pH thaum me me ntawm cov kua qaub muaj zog lossis cov hauv paus ntxiv.
Kuj paub, dab tsi yog qhov tsis nyob hauv titration?
A tsis pub yog ib qho kev daws teeb meem uas tuaj yeem tiv thaiv pH hloov thaum ntxiv cov kua qaub lossis cov khoom siv hauv paus. Nws muaj peev xwm neutralize me me ntawm cov kua qaub ntxiv los yog hauv paus, yog li tswj cov pH ntawm cov tshuaj kuj ruaj khov. Thumbnail: Simulated titration ntawm ib qho acidified tov ntawm ib tug qaug zog acid (pKa = 4.7) nrog alkali.
Kuj Paub, vim li cas qhov tsis zoo tshaj plaws hauv nws cov pKa? Lub peev xwm ntawm a tsis daws kom tswj tau qhov pH yuav luag tas li thaum ib qho me me ntawm cov kua qaub los yog cov hauv paus ntxiv rau cov tshuaj yog qhov loj tshaj ntawm qhov pKa thiab diminishes raws li pH ntawm cov tshuaj mus rau saum toj los yog hauv qab lub pKa.
Qhov thib ob, qhov sib npaug tsis yog dab tsi?
Qhov sib npaug kev sib npaug rau a tsis pub yog: HA⇌H++ A- Lub zog ntawm cov kua qaub tsis muaj zog feem ntau yog sawv cev raws li qhov sib npaug. Lub acid-dissociation equilibrium tas li (Ka), uas ntsuas qhov propensity ntawm cov kua qaub rau dissociate, rau cov tshuaj tiv thaiv yog: Ka = [H+][A−][HA]
pKa txhais li cas?
Cov ntsiab lus tseem ceeb: pKa txhais Cov pKa tus nqi yog ib txoj kev siv rau qhia lub zog ntawm ib tug acid. pKa yog lub cav tsis zoo ntawm cov kua qaub dissociation tas li los yog Ka tus nqi. Ib qho qis pKa tus nqi qhia tias muaj zog acid. Ntawd yog, tus nqi qis dua qhia tias cov kua qaub ntau dissociates hauv dej.
Pom zoo:
Ob qhov tseem ceeb ntawm lub voj voog ntawm tes yog dab tsi thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Muaj ob theem tseem ceeb hauv lub voj voog ntawm tes. Thawj theem yog interphase thaum lub cell loj hlob thiab replicates nws DNA. Qhov thib ob yog theem mitotic (M-Phase) thaum lub sijhawm cell faib thiab hloov ib daim qauv ntawm nws cov DNA mus rau ob lub hlwb zoo tib yam
Yuav ua li cas koj lub npe compounds nyob rau hauv Khan Academy?
Rau binary ionic compounds (ionic compounds uas tsuas muaj ob hom ntawm cov ntsiab lus), cov tebchaw muaj npe los ntawm kev sau lub npe ntawm cov cation ua ntej tom qab lub npe ntawm cov anion
Dab tsi yog tsib lub hauv paus Circuit Court Cheebtsam lawv lub tsev yog dab tsi?
Cov no yog cov feem ntau siv: resistors. Capacitors. LEDs. Transistors. Inductors. Integrated Circuits
Dab tsi yog 2 qhov tseem ceeb ntawm lub voj voog ntawm tes thiab dab tsi tshwm sim rau lub cell hauv txhua theem?
Cov xwm txheej no tuaj yeem muab faib ua ob qhov tseem ceeb: interphase (hauv nruab nrab ntawm kev sib faib theem ua pawg G1 theem, S theem, G2 theem), thaum lub xov tooj ntawm tes tsim thiab ua nrog nws cov haujlwm metabolic; mitotic theem (M mitosis), thaum lub sij hawm lub cell yog replicating nws tus kheej
Dab tsi yog qhov flux los ntawm lub voos xwmfab ntawm sab yog tias tus nqi ntawm Q yog ntawm ib qho ntawm nws lub ces kaum?
Raws li peb paub tias, tag nrho cov flux los ntawm tus nqi q yog q / ε 0 (Gauss txoj cai). Yog hais tias tus nqi yog nyob rau ntawm lub ces kaum ntawm lub voos xwmfab, ib co ntawm cov flux nkag mus rau hauv lub voos xwmfab thiab tawm los ntawm ib co ntawm nws lub ntsej muag. Tab sis qee qhov flux tsis nkag mus rau hauv lub voos xwmfab. Qhov 1/8th no yuav muab faib ua 3 ntu dua