{"id":12353,"date":"2020-05-14T14:36:52","date_gmt":"2020-05-14T12:36:52","guid":{"rendered":"https:\/\/agora.xtec.cat\/ieribesdefreser\/?p=12353"},"modified":"2020-05-14T18:46:56","modified_gmt":"2020-05-14T16:46:56","slug":"experiments-casolans-3","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/ieribesdefreser\/general\/experiments-casolans-3\/","title":{"rendered":"Experiments casolans 3"},"content":{"rendered":"<p>En el darrer article d&#8217;experiments casolans veiem com a vegades quan ajuntem dues subst\u00e0ncies reaccionen qu\u00edmicament transformant-se en productes diferents, nous. Per\u00f2 no sempre quan barregem dues subst\u00e0ncies reaccionen qu\u00edmicament i canvien, a vegades aquestes no es combinen per formar-ne de noves i continuen sent elles. Quan aix\u00f2 passa diem que estem fent una mescla.<br \/>\nSembla que aquests dies m\u00e9s d&#8217;un alumne ha experimentat amb alguna mescla:<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Pau Densitat\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/TfcWufRFihU?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>En aquest video el Pau ens demostra com un mateix ou pot surar o no surar depenent de la <strong>densitat<\/strong> del l\u00edquid on el posem: sobre l&#8217;aigua no sura perqu\u00e8 l&#8217;ou t\u00e9 m\u00e9s densitat, per\u00f2 sobre l&#8217;aigua amb for\u00e7a sal s\u00ed que sura, ja que aquesta aigua salada t\u00e9 m\u00e9s densitat que l&#8217;ou, l&#8217;aigua amb sal \u00e9s una <strong>mescla homog\u00e8nia<\/strong> perqu\u00e8 no es poden diferenciar les dues subst\u00e0ncies barrejades.<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Andreu Mescles\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/ImDrml9rfn8?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>Com podeu veure l&#8217;Andreu ha fet una <strong>mescla heterog\u00e8nia<\/strong>, perqu\u00e8 l&#8217;oli i l&#8217;aigua no es barregen i quan els mesclem es poden veure perfectament l&#8217;oli i l&#8217;aigua, l&#8217;oli t\u00e9 menys densitat que l&#8217;aigua i per aix\u00f2 queda per sobre de l&#8217;aigua.<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Joel Tensi\u00f3 Superficial\" width=\"500\" height=\"375\" src=\"https:\/\/www.youtube.com\/embed\/cZxOM-x82O4?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>El Joel ha barrejat llet, colorant i sab\u00f3. Per\u00f2 el que ell volia observar no era la mescla sin\u00f3 com el sab\u00f3 trenca la <strong>tensi\u00f3 superficial<\/strong> de la llet i fa aquestes bombolles expansives que el colorant ens permet veure. La tensi\u00f3 superficial \u00e9s una propietat d&#8217;alguns l\u00edquids que fan que es comportin amb una mena de capa superficial degut a l&#8217;atracci\u00f3 que es fan entre elles les mol\u00e8cules del l\u00edquid.<\/p>\n<div class=\"ast-oembed-container \" style=\"height: 100%;\"><iframe loading=\"lazy\" title=\"Jana Tensi\u00f3 Superficial\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/UaDUwXF-WvA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe><\/div>\n<p>La Jana tamb\u00e9 ha barrejat aigua, pebre i sab\u00f3 per observar exactament el mateix que el Joel, per\u00f2 en aquest cas el l\u00edquid \u00e9s l&#8217;aigua que t\u00e9 <strong>tensi\u00f3 superficial<\/strong> i fa servir el pebre, en comptes del colorant, per poder observar l&#8217;onda expansiva que provoca el sab\u00f3.<\/p>\n<p>Interessant veritat?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En el darrer article d&#8217;experiments casolans veiem com a vegades quan ajuntem dues subst\u00e0ncies reaccionen qu\u00edmicament transformant-se en productes diferents, nous. Per\u00f2 no sempre quan barregem dues subst\u00e0ncies reaccionen qu\u00edmicament i canvien, a vegades aquestes no es combinen per formar-ne de noves i continuen sent elles. Quan aix\u00f2 passa diem que estem fent una mescla. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":12360,"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":[14,120,1,4,5],"tags":[],"class_list":["post-12353","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-5e","category-ciencies","category-general","category-portada","category-primaria"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/posts\/12353","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/comments?post=12353"}],"version-history":[{"count":4,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/posts\/12353\/revisions"}],"predecessor-version":[{"id":12362,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/posts\/12353\/revisions\/12362"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/media\/12360"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/media?parent=12353"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/categories?post=12353"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/ieribesdefreser\/wp-json\/wp\/v2\/tags?post=12353"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}