Qhov sib txawv tseem ceeb ntawm kev ncua thiab colloid yog tias cov khoom nyob rau hauv lub ncua kev kawm ntawv yog loj dua li hais nyob rau hauv ib tug colloid.
Ib qho sib tov yog kev sib koom ua ke ntawm ntau yam khoom. Kev ncua, kev daws teeb meem, thiab colloids yog ob qho piv txwv ntawm cov khoom sib tov. Txij li cov khoom hauv cov khoom sib tov tsis sib xyaw ua ke, peb tuaj yeem cais lawv los ntawm kev pom, nag lossis daus, evaporation, thiab lwm yam. Muaj ob hom kev sib tov, homogeneous mixtures thiab heterogeneous mixtures. Nyob rau hauv ib tug homogeneous sib tov, muaj pes tsawg leeg yog uniform, tab sis nyob rau hauv heterogeneous sib tov, nws tsis yog uniform.
Kev ncua yog dab tsi?
Ncua tseg yog ib qho sib xyaw ua ke ntawm cov tshuaj (piv txwv li, dej nkos, hmoov yaj hauv dej). Muaj ob yam khoom nyob rau hauv lub ncua kev kawm ntawv, cov khoom dispersed thiab cov dispersion nruab nrab. Muaj cov khoom loj dua (cov khoom siv dispersed) uas faib rau hauv qhov nruab nrab dispersion. Qhov nruab nrab tuaj yeem tshwm sim ua kua, roj lossis khoom. Txawm li cas los xij, cov khoom tawg yog feem ntau yog khov.
Daim duab 01: Kev daws cov khoom hauv Kev Ncua vim yog qhov cuam tshuam ntawm lub ntiajteb txawj nqus
Txawm li cas los xij, yog tias peb tso cai rau qhov ncua sij hawm kom nyob twj ywm rau qee lub sijhawm, cov khoom nyob rau hauv qab. Yog hais tias peb sib tov nws, lub ncua kev kawm ntawv rov ua dua. Cov khoom hauv qhov raug ncua yog pom ntawm qhov muag liab qab, thiab los ntawm kev pom, peb tuaj yeem cais lawv. Vim tias cov khoom loj dua, cov khoom ncua kev kawm yuav ua rau opaque thiab tsis pob tshab, vim lawv tsis kis lub teeb.
Colloid yog dab tsi?
Colloidal tov zoo nkaus li ib homogeneous sib tov, tab sis nws kuj tuaj yeem tshwm sim raws li kev sib xyaw ua ke (piv txwv li, mis nyuj, pos). Cov khoom hauv cov tshuaj colloidal yog qhov nruab nrab me me (loj dua cov molecules) yog tias peb muab piv nrog cov khoom hauv cov kev daws teeb meem thiab kev ncua, tab sis raws li cov khoom hauv cov kev daws teeb meem, lawv tsis pom ntawm qhov muag liab qab, thiab peb tsis tuaj yeem lim lawv siv cov ntawv lim. Peb lub npe cov khoom nyob rau hauv ib tug colloid li dispersed khoom, thiab cov dispersing nruab nrab yog analogous rau hnyav nyob rau hauv ib tug tov.
Daim duab 02: Mis yog Colloid
Raws li cov khoom tawg thiab qhov nruab nrab, muaj ntau hom colloids. Piv txwv li, yog tias cov khoom tawg yog cov roj hauv cov kua nruab nrab, cov txiaj ntsig colloid yog 'ua npuas ncauj' (e.g., whipped cream). Yog tias daim ntawv colloid los ntawm kev sib xyaw ntawm ob lub kua, peb hu nws ua emulsion (piv txwv li, mis nyuj). Cov khoom faib nyob rau hauv qhov nruab nrab colloidal thiab tsis nyob twj ywm yog tias nws tseem tshuav. Colloidal daws yog translucent los yog opaque. Qee zaum, cov khoom hauv colloid cais tawm los ntawm centrifugation lossis coagulation. Piv txwv li, cov proteins hauv cov mis nyuj coagulate thaum peb muab cua sov los yog peb ntxiv cov kua qaub.
Qhov txawv ntawm Kev ncua thiab Colloid yog dab tsi?
Kev ncua thiab colloids yog ob hom kev sib xyaw uas muaj ob lossis ntau yam khoom sib xyaw ua ke. Qhov sib txawv tseem ceeb ntawm kev ncua thiab colloid yog hais tias cov khoom nyob rau hauv lub ncua kev kawm ntawv yog loj dua hais nyob rau hauv ib tug colloid. Lwm qhov sib txawv tseem ceeb ntawm kev ncua thiab colloid yog qhov kev ncua yog qhov sib xyaw ua ke thaum colloid tuaj yeem muaj nyob hauv homogeneous lossis heterogeneous sib tov. Thaum xav txog qhov kev daws teeb meem ntawm cov khoom hauv txhua qhov sib tov, cov khoom hauv qhov raug tshem tawm tuaj yeem nyob hauv qab ntawm lub ntiajteb txawj nqus, yog tias peb tsis cuam tshuam cov txheej txheem daws teeb meem. Tab sis, cov khoom nyob rau hauv ib tug colloid tsis nyob rau hauv ib txwm tej yam kev mob. Li no, qhov no kuj yog qhov sib txawv ntawm kev ncua thiab colloid.
Txawm li cas los xij, vim qhov sib txawv ntawm qhov ntau thiab tsawg, cov khoom ntawm qhov raug ncua tsis tuaj yeem dhau los ntawm cov ntawv lim, tab sis cov khoom ntawm colloid tuaj yeem. Yog tias peb xav txog cov khoom siv kho qhov muag, peb tuaj yeem pom lwm qhov sib txawv ntawm kev ncua thiab colloid. Ntawd yog, cov raug tshem tawm yog opaque vim lawv tsis kis lub teeb thaum lub colloids yog opaque los yog translucent vim lawv muaj peev xwm tawg lub teeb.
Summary – Suspension vs Colloid
Txawm hais tias ob qho tib si suspensions thiab colloids yog cov khoom sib xyaw, muaj ntau qhov sib txawv ntawm lawv. Qhov sib txawv tseem ceeb ntawm kev ncua thiab colloid yog tias cov khoom nyob rau hauv lub ncua kev kawm ntawv yog loj dua li hais nyob rau hauv ib tug colloid.
