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Siv lim ntawv ua thwmsim Science News for KIDS

- Oct 09, 2015 -

Nraum zoov lim ntawv ntxiv nrog rau qhov filtering, feem ntau tau siv lwm yam thwmsim, xws li roj a rau ntawv lim xuas nplaim potassium, sodium, siv lim ntawv li lub noob uas nplaim tshuaj tiv thaiv, siv lim ntawv laminated thwmsim ntawm tes, tsuag xim cov tshuaj tiv thaiv mob ntawv lim, thiab li ntawm. Cov nram no pabneeg ntau lub, tus sawv cev piv:


1, Event sodium thiab dej


cov sijhawm ua haujlwm 1.1


Noj ib phaj Petri, mus rau hauv lub 1/2 ntawm lub ntim dej, ntxiv ob peb ncos phenolphthalein dej, ua tib zoo txiav ib tug yeej lim ntawv muab lo rau ntawm tej tus nto, siv tus ciaj tais noj taum me me lis ntawm sodium hlau, tom qab raug tshem tawm cov roj tso rau lim daim ntawv ntub dej, thiab them ib beaker loj loj. Vim sodium ntawm daim ntawv lim tsis tau da dej, lawv tsis yog yooj yim mus, sodium yuav pom nyob ntawm tej lim ntawv melted rau hauv pob, thiab tom qab ib pliag tsis ntev, thiab muab ib daj nplaim thiab ua ntau cov pa luam yeeb (cov khoom muag yog lub teeb daj sodium peroxide, thaum lub sij muaj kev soj xyuas tus yeeb xim dawb) dawb, liab gradient lim nyob rau hauv cov dej tshuaj.


1.2 paub meej


(1) lim tsis tau muab raus rau hauv dej, nws yuav ntab hauv dej, los sis sodium tsis hlawv.


(2) lub potassium hlau reacts dej kuj yuav siv cov kev no.


(3) ntawm lim daim ntawv ntub dej Event sodium thiab tsis muaj hais ua luam dej ncig lub phenomenon channeling thiab lub txaws, suggesting tias kev hloov hauv cov tshuaj tiv thaiv mob ua rau koj phenomena hloov sodium.


(4) rau qhov xyaum ua tej yam muaj lub kom zoo dua: phenomena nyob rau hauv cov tshuaj tiv thaiv ntawm sodium thiab dej yuav tsis tsuas pom tab sis kuj yuav soj ntsuam cov phenomenon uas xyaum ua tej yam rau sodium hle tawv cua experimentally si ruaj ntseg, thiab tsis pub muaj kuab paug.


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