Transformari de stare de agregare by Vlad Necula https://padlet.com/necula_vlad/yj82wnqok6pxkhp4 en-us 2020-12-11 07:06:43 UTC 2024-10-13 17:01:54 UTC hello@padlet.com https://padlet.net/icons/png/1f976.png Topirea: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009049589 Este fenomenul de trecere al unei substante din stare solida in stare lichia.]]> 2020-12-11 07:19:21 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009049589 Solidificarea( cristalizarea) necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009053271  Este: fenomenul de trecere al unei substante din stare lichida in stare solida.]]> 2020-12-11 07:22:15 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009053271 Caldura latenta specifica: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009056042 Este marimea fizica scalara λt definita de relatia:
  λt=Q/m]]> 2020-12-11 07:24:31 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009056042 1)Topirea necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009061266 are loc cu absortie de caldura din exterior, iar solidificarea cu cedare de caldura din exterior.

]]> 2020-12-11 07:28:39 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009061266 2)In timpul topirii substantelor necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009065238 cristaline temperatura ramane constanta, la o valoare numita temperatuda de topire;aceste substante cristalizeaza tot la o temperatura constanta, numita temperatura de cristalizare, egala cu temperatura de topire.]]> 2020-12-11 07:31:45 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009065238 3)Substantele amorfe necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009070667 (ex:smoala) nu au o temperatura precisa de topire:prin incalzire ele se inmoaie treptat si devin din ce in ce mai fluide.]]> 2020-12-11 07:35:44 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009070667 1)Temperatura de cristalizare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009075105 este influentata de dizolvarea unor substante.]]> 2020-12-11 07:39:18 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009075105 2)Topirea este un proces reversibil. necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009079129 De aceea in procesul invers solidificarea, caldura cedata exteriorului (caldura latenta de solidiificare) este egala, in modul cu caldura latenta de topire.]]> 2020-12-11 07:42:31 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009079129 3) Caldura latenta specifica de topire necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009092560 si temperatura de topire sunt marimi fizice caracteristice pentru fiecare substanta.]]> 2020-12-11 07:52:39 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009092560 Constatari: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009103114 2020-12-11 08:00:13 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009103114 Observatii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009105054 2020-12-11 08:01:38 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009105054 Definitii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009107900 2020-12-11 08:03:41 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009107900 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009117441 2020-12-11 08:09:45 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009117441 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009117548 2020-12-11 08:09:50 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1009117548 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030415772 2020-12-18 06:12:16 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030415772 In concluzie, necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030417482 topirea si solidificarea substantelor cristalinne se realizeaza la temperatura constanta daca presiunea ramane constanta]]> 2020-12-18 06:13:51 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030417482 Se numeste vaporizare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030418653 fenomenul de trecere al unei substante din stare lichida in stare de vapori.]]> 2020-12-18 06:14:58 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030418653 Se numeste condensare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030419209 fenomenul de trecere al unei substante din stare de vapori in stare lichida.]]> 2020-12-18 06:15:29 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030419209 Definitii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030419705 2020-12-18 06:15:59 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030419705 Se numeste caldura latenta specifica necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030420048 de vaporizare(condensare) la temperatura constanta, marimea fizica scalara λv  definita de relatia:
λv=Q/m
 
λv este caldura latenta specifica de vaporizare  [λv]SI=J/kg

Q este caldura latenta de vaporizare/condensare a masei m de substanta; [Q]SI=J,[m]SI=kg]]> 2020-12-18 06:16:10 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030420048 Observatii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030424793 2020-12-18 06:20:44 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030424793 Caldura latenta de vaporizare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030425070 si temperatura de vaporizare sunt marimi caracteristice pentru fiecare substanta.]]> 2020-12-18 06:20:58 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030425070 Putem identifica urmatoarele situatii in functie de conditiile in care are loc vaporizarea: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030426386 2020-12-18 06:22:06 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030426386 Constatari: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030427119 2020-12-18 06:22:48 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030427119 1)Vaporizarea necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030427284 are loc cu absortie de caldura din exterior, iar condensarea cu cedare de caldura din exterior.

]]> 2020-12-18 06:22:58 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030427284 2)In timpul voparizarii necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030428117 temperatura ramane constanta, la o valoare numita temperatura de vaporizare;vaporii unei substante condenseaza tot la o temperatura constanta, numita temperatura de condensare, egala cu temperatura de vaporizare.]]> 2020-12-18 06:23:40 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030428117 3)Deoarece temperatura ramane constanta, necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030430131 caldura primita din exterior in timpul vaporizarii serveste numai la invingerea fortelor de coeziune si, dde aceea, ea este numita caldura latenta de vaporizare.]]> 2020-12-18 06:25:34 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030430131 4)Vaporizarea este un proces reversivil. necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030431790 De aceea, in procesul invers, condensarea, caldura cedata exteriorului (numita caldura latenta de condensare) este egala, in modul, cu caldura latenta de vaporizare.]]> 2020-12-18 06:27:07 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030431790 Vaporizarea in vid este instantanee. necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030437279 2020-12-18 06:31:40 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030437279 Vaporizarea in vid continua necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030437509 pana cand presiunea vaporilor atinge o valoare maxima pm.]]> 2020-12-18 06:31:52 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030437509 Se numesc vapori saturanti necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030439778 vaporii aflati in echilibru dinamic cu lichidul din care provin.]]> 2020-12-18 06:33:56 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030439778 Constatari: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030444136 2020-12-18 06:37:26 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030444136 1)Presiunea vaporilor saturanti necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030444309 nu depinde de masa lichidului si nici de masa vaporilor aflati in contact cu lichidul din care provin.]]> 2020-12-18 06:37:35 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030444309 2)La temperatura constanta necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030445015 presiunea vaporilor saturanti nu depinde de volum: cresterea volumului conduce la vaporizarea unei cantitati suplimentare de lichid iar scaderea volumului la condensarea unei cantitati de vapori, dar nivelul coloanei de mercur nu se sechimba.]]> 2020-12-18 06:38:15 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030445015 3)Presiunea vaporilor saturanti necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030447090 depinde de temperatura.]]> 2020-12-18 06:39:54 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030447090 4)La temperatura constanta, necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030447730 presiunea vaporilor saturanti depinde numai de natura lichidului din care provin.]]> 2020-12-18 06:40:24 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030447730 Observatii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030449943 2020-12-18 06:42:15 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030449943 Cand temperatura creste, necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030450625 energia cinetica medie a moleculelor de lichid creste si ea si, de aceea, un numar mai mare de mulecule pot parasi lichidul si pot trece in starea de vapori.Astfel se explica cresterea presiunii vaporilor saturanti cand creste temperatura.]]> 2020-12-18 06:42:50 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030450625 Dependenta presiunii vaproilor saturanti de natura lichidului necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030453157 se explica prin faptul ca fortele intermoleculare (fortele de coeziune), deci si lurcrul mecanic care trebuie efectuat impotriva rezultantei acestor forte sunt caracteristice fiecarui lichid.]]> 2020-12-18 06:44:52 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030453157 Spre deosebire de vaporizarea in vid, se realizeaza lent. necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030456715 2020-12-18 06:47:53 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030456715 Experimental se constata ca necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030457364 presiunea vaporilor saturanti este independenta de existenta altor vapori sau gaze in incinta care il contine.]]> 2020-12-18 06:48:26 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030457364 Primul carea a facut aceasta constatare a fost John Dalton(1766-1844). necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030457945 2020-12-18 06:48:56 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030457945 Definitii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030466274 2020-12-18 06:55:45 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030466274 Se numeste sublimare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030466484 fenomenul de trecere a unei substante din stare solida, direct in stare lichida.]]> 2020-12-18 06:55:54 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030466484 Se numeste desublimare necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030467907 fenomenul de trecere a unei substante din starea de vapori, direct, in starea solida.]]> 2020-12-18 06:57:07 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030467907 Observatii: necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030469333 2020-12-18 06:58:13 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030469333 Zapada si gheata sublimeaza trecand direct in vapori. necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030470238 Asa se explica uscaraea rufelor inghetate (iarna).]]> 2020-12-18 06:58:58 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030470238 Tot prin fenomenul de sublimare se explica mirosul unor corpuri solide(sapun, detergent etc) necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030471924 2020-12-18 07:00:17 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030471924 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030490115 2020-12-18 07:13:28 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030490115 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030490159 2020-12-18 07:13:31 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030490159 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030495226 2020-12-18 07:17:13 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030495226 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030499320 2020-12-18 07:19:50 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030499320 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030500014 2020-12-18 07:20:20 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030500014 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030540727 2020-12-18 07:47:46 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030540727 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030541681 2020-12-18 07:48:22 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030541681 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030542672 2020-12-18 07:48:59 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030542672 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030543360 2020-12-18 07:49:25 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030543360 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030544304 2020-12-18 07:50:01 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030544304 necula_vlad https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030544752 2020-12-18 07:50:20 UTC https://padlet.com/necula_vlad/yj82wnqok6pxkhp4/wish/1030544752