Cov txheej txheem:

Yuav ua li cas koj txiav txim lub freezing point?
Yuav ua li cas koj txiav txim lub freezing point?

Video: Yuav ua li cas koj txiav txim lub freezing point?

Video: Yuav ua li cas koj txiav txim lub freezing point?
Video: Tus ntseeg Yexus yuav tsum ua li cas thiaj li yuav loj hlob ntawm txoj kev ntseeg. 2024, Kaum ib hlis
Anonim

Tswv yim:

  1. Kauj ruam 1: xam tus qhov chaw khov kev nyuaj siab ntawm benzene. Tf = ( Qhov chaw khov ntawm cov kuab tshuaj ntshiab) - ( Qhov chaw khov ntawm kev daws)
  2. Kauj ruam 2: xam lub molal concentration ntawm cov tshuaj. molality = moles ntawm solute / kg ntawm hnyav.
  3. Kauj Ruam 3: xam Kf ntawm qhov kev daws teeb meem. Tf = (Kf) (m)

Yog li ntawd, dab tsi yog lub mis rau khov point?

Cov qhov chaw khov kev nyuaj siab ∆T = KF·m qhov twg KF yog molal qhov chaw khov kev nyuaj siab tas li thiab m yog tus molality ntawm tus solute. Rearrangement muab: mol solute = (m) x (kg hnyav) qhov twg kg ntawm hnyav yog qhov hnyav ntawm cov kuab tshuaj (lauric acid) hauv qhov sib tov. Qhov no muab cov moles ntawm solute.

Tsis tas li ntawd, ua li cas koj thiaj paub tias cov tshuaj twg muaj qhov qis tshaj qhov khov? Teb thiab piav qhia: Qhov chaw khov ntawm ib tug ntshiab solvent nyob ntawm tus nqi ntawm solute uas tau yaj nyob rau hauv nws. Nyob rau hauv thiaj li yuav txiav txim siab seb cov tshuaj twg muaj qhov chaw txias tshaj plaws , peb yuav tsum tau saib cov molality thiab seb cov solute yog ionic los yog covalent.

Tsis tas li ntawd, koj yuav txiav txim siab qhov chaw khov ntawm cov kua li cas?

Raws li nrog khov , lub melting point kub nyob twj ywm ntawm tib nyeem ntawv kom txog rau thaum cov khoom ua ua kua . Ntxig tus pas ntsuas kub rau hauv slush, ua ntej koj nyob nraum ntsuas tig kiag li ua kua . Cia tus pas ntsuas kub nyob rau ntawd kom txog rau thaum lub taw tes thaum nws ua tag nrho ua kua . Sau cov kub thaum ntawd tshwm sim.

Puas yog qhov chaw khov kho kev nyuaj siab zoo lossis tsis zoo?

ΔTtrs, kev hloov pauv hauv theem hloov taw tes , uas yog ib txwm tsis zoo rau freezing point kev nyuaj siab thiab zoo rau boil taw tes qhov siab.

Pom zoo: