{"id":4745,"date":"2024-06-17T16:23:14","date_gmt":"2024-06-17T14:23:14","guid":{"rendered":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/?p=4745"},"modified":"2024-06-17T16:23:14","modified_gmt":"2024-06-17T14:23:14","slug":"experimentem-amb-colorants","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/general\/experimentem-amb-colorants\/","title":{"rendered":"EXPERIMENTEM AMB COLORANTS"},"content":{"rendered":"

<\/h3>\n

VARIANT 1 llet amb colorant<\/u><\/h3>\n

Qu\u00e8 necessitem?<\/h3>\n

Plat fondo
\nLlet
\nRentavaixelles
\nColorants alimentari<\/p>\n

Com ho fem?<\/h3>\n

Afegim llet en un plat fondo. I a continuaci\u00f3 posem unes quantes gotes de diferents colorants alimentaris.<\/p>\n

Suquen el dit\u00a0 en rentavaixelles i l’apropen a la superf\u00edcie de la llet.<\/p>\n

Veieu quines obres d\u2019art m\u00e9s fant\u00e0stiques poden fer?<\/p>\n

Qu\u00e8 passa?<\/h3>\n

En aquest experiment el nostre llen\u00e7 de llet no deixa que els colorants es dissolguin r\u00e0pidament perqu\u00e8 la llet, a part d\u2019aigua, tamb\u00e9 cont\u00e9 prote\u00efnes, greixos i altres components que provoquen que els colorants es quedin concentrats.<\/p>\n

Quan toquem la llet amb el sab\u00f3, els colors se separen r\u00e0pidament. Aix\u00f2 \u00e9s possible perqu\u00e8 el sab\u00f3 t\u00e9 la propietat de trencar la tensi\u00f3 superficial i alterar les unions de les mol\u00e8cules provocant la ruptura d\u2019aquesta tensi\u00f3.<\/p>\n

La\u00a0tensi\u00f3 superficial<\/strong>\u00a0\u00e9s una\u00a0propietat dels l\u00edquids<\/strong>\u00a0que fa que\u00a0la capa superficial es comporti com una pell<\/strong>, ja que les mol\u00e8cules d\u2019aigua s\u2019atreuen entre si i exerceixen tensi\u00f3.<\/p>\n

El fet que despr\u00e9s els colors es vagin barrejant i dissolent a poc a poc \u00e9s conseq\u00fc\u00e8ncia de l\u2019efecte del sab\u00f3 sobre la llet. I \u00e9s que les mol\u00e8cules de sab\u00f3 tenen un costat liposoluble que fa que s\u2019uneixin als greixos, mentre que el costat hidrosoluble fa que el sab\u00f3 es dissolgui en l\u2019aigua. Per aix\u00f2 el sab\u00f3 fa que el greix, l\u2019aigua i la resta de components de la llet es moguin facilitant d\u2019aquesta manera el moviment dels colorants.<\/p>\n

 <\/p>\n

VARIANT 2 \u2018L\u2019aigua que camina d\u2019un got a l\u2019altre<\/u><\/strong>\u201d<\/h3>\n

Qu\u00e8 necessitarem?<\/strong><\/h3>\n
    \n
  • 4 gots transparents no massa grans<\/li>\n
  • Una gerra amb aigua per omplir els gots<\/li>\n
  • Colorant alimentari de 4 colors diferents (groc, blau, vermell i negre)<\/li>\n
  • Paper de cuina absorbent blanc<\/li>\n<\/ul>\n

    Com ho fem?<\/h3>\n

    El primer pas \u00e9s col\u00b7locar els gots en filera a la taula. Seguidament omplim 2 dels 3 gots amb aigua. S\u2019han d\u2019omplir 2\/3 parts de cada got. Cal omplir el primer, el tercer (got del mig) i l\u2019\u00faltim got.<\/p>\n

    A continuaci\u00f3 posem tres gotes de colorant alimentari en els gots que tenen aigua. Fem servir un color diferent a cada got. \u00a0Ara cal barrejar-ho tot b\u00e9 fins que es dissolgui i l\u2019aigua quedi ben acolorida. Si el color \u00e9s fluix, cal afegir m\u00e9s colorant.<\/p>\n

    Seguidament agafem 4 trossos de paper de cuina. Dobleguem cada tros 2 vegades pel mig fins tenir uns rectangles estrets i llargs que serviran per connectar els gots. Cal fer 3 connectors i col\u00b7locar-los de tal manera que connectem un got amb l\u2019altre. En el got on hi ha l\u00edquid, el paper es mullar\u00e0.<\/p>\n

    Ara tingueu una mica de paci\u00e8ncia per veure qu\u00e8 passa. \u00a0Passat uns 30 minuts comen\u00e7arem a veure com l\u2019aigua passa al seg\u00fcent got. Passades aproximadament unes 6 hores el volum de l\u2019aigua als gots s\u2019haur\u00e0 anivellat. En aquest moment podem donar per acabat el nostre experiment.<\/p>\n

    Qu\u00e8 passa?<\/h3>\n

    L\u2019aigua poc a poc \u201cescala\u201d pel paper fins arribar al got seg\u00fcent. Ascendeix en contra de la gravetat a trav\u00e9s dels\u00a0capil\u00b7lars del paper<\/strong>, que s\u00f3n com\u00a0petits tubs invisibles<\/strong>\u00a0als nostres ulls.<\/p>\n

    El que observem \u00e9s\u00a0la capil\u00b7laritat<\/strong>, un\u00a0fenomen f\u00edsic que permet a un l\u00edquid ascendir per una superf\u00edcie fins a certa al\u00e7ada<\/strong>, gr\u00e0cies a les forces d\u2019adhesi\u00f3 de les mol\u00e8cules del l\u00edquid al paper<\/strong>.<\/p>\n

    L\u2019aigua puja pel paper degut al fet que la for\u00e7a intermolecular (o atracci\u00f3 entre mol\u00e8cules) de l\u2019aigua \u00e9s menor que l\u2019adhesi\u00f3 de l\u2019aigua amb el material del paper absorbent. \u00c9s a dir l\u2019aigua i el paper absorbent \u201cs\u2019atreuen\u201d. Per aix\u00f2, l\u2019aigua puja pel paper en comptes de baixar, desafiant aix\u00ed la llei de la gravetat<\/strong>.<\/p>\n

    Sabies que\u2026?<\/strong>\u00a0Les plantes utilitzen la capil\u00b7laritat per absorbir l\u2019aigua del terra. Les plantes absorbeixen aigua i altres subst\u00e0ncies a trav\u00e9s de l\u2019arrel i s\u00f3n transportades pels vasos conductors per capil\u00b7laritat.<\/p>\n

     <\/p>\n

    \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\" \"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

    VARIANT 1 llet amb colorant Qu\u00e8 necessitem? Plat fondo Llet Rentavaixelles Colorants alimentari Com ho fem? Afegim llet en un plat fondo. I a continuaci\u00f3 posem unes quantes gotes de diferents colorants alimentaris. Suquen el dit\u00a0 en rentavaixelles i l’apropen a la superf\u00edcie de la llet. Veieu quines obres d\u2019art m\u00e9s fant\u00e0stiques poden fer? Qu\u00e8 […]<\/p>\n","protected":false},"author":1,"featured_media":4794,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1,4],"tags":[],"class_list":["post-4745","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-general","category-portada"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/posts\/4745","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/comments?post=4745"}],"version-history":[{"count":1,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/posts\/4745\/revisions"}],"predecessor-version":[{"id":4805,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/posts\/4745\/revisions\/4805"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/media\/4794"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/media?parent=4745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/categories?post=4745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/escolaantonibergosbutsenit\/wp-json\/wp\/v2\/tags?post=4745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}