{"id":10911,"date":"2018-07-13T12:52:15","date_gmt":"2018-07-13T10:52:15","guid":{"rendered":"http:\/\/agora.xtec.cat\/insandreunin\/?p=10911"},"modified":"2018-07-13T12:52:15","modified_gmt":"2018-07-13T10:52:15","slug":"concurs-cristal%c2%b7litzacio","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/insandreunin\/cursos\/eso-4\/concurs-cristal%c2%b7litzacio\/","title":{"rendered":"CONCURS CRISTAL\u00b7LITZACI\u00d3"},"content":{"rendered":"<p><strong><u>VII Concurs de cristal\u00b7litzaci\u00f3<\/u><\/strong><\/p>\n<p style=\"text-align: justify;\">4 de maig de 2018<\/p>\n<p style=\"text-align: justify;\">Com pot ser que a la qu\u00edmica se la conegui com a ci\u00e8ncia experimental \u2013mot que prov\u00e9 d\u2019experimentar\u2013 i els alumnes que cursen aquesta magn\u00edfica ci\u00e8ncia es puguin passar 6 anys estudiant-la sense realitzar pr\u00e0cticament cap experimentaci\u00f3 al laboratori?<\/p>\n<p style=\"text-align: justify;\">Aquesta va ser la premissa que ens va motivar per proposar als alumnes de participar al VII Concurs de cristal\u00b7litzaci\u00f3 organitzat per la UB \u2013amb col\u00b7laboraci\u00f3 d\u2019altres universitats com la URV- com a activitat extraescolar. Els alumnes, al tractar-se d\u2019una activitat completament diferent del que estan acostumats a fer a classe, van estar encantats de participar-hi des del primer moment.<\/p>\n<p style=\"text-align: justify;\">Tot i que es tracta d\u2019un concurs, i que de tots els alumnes que hi participin, en grups de tres, n\u2019haguem de triar un per a participar a la jornada final que es realitzar\u00e0 a Barcelona el divendres 4 de Maig, des del Departament de Ci\u00e8ncies Experimentals no ens ho vol\u00edem prendre com a tal. Vol\u00edem donar la oportunitat als alumnes de 4t d\u2019ESO de l\u2019assignatura de F\u00edsica i Qu\u00edmica de involucrar-se en el fant\u00e0stic m\u00f3n de la cristal\u00b7litzaci\u00f3 i actuar com a aut\u00e8ntics cient\u00edfics \u2013s\u00ed, els t\u00edpics cient\u00edfics amb cara de <em>freak<\/em> que porten bata i anoten tot all\u00f2 estrany que passa al seu voltant en una llibreta.<\/p>\n<p style=\"text-align: justify;\">Com que tota pr\u00e0ctica necessita tenir un coneixements previs, vam fer una petita sessi\u00f3 de formaci\u00f3 per a que els alumnes no anessin amb les mans buides a les sessions pr\u00e0ctiques i entenguessin els fonaments b\u00e0sics de la cristal\u00b7litzaci\u00f3. Aix\u00ed doncs, sessi\u00f3 te\u00f2rica realitzada, vam comen\u00e7ar a posar-nos mans a la feina i a realitzar els primers cristalls. El m\u00e8tode utilitzat \u2013d\u2019entre els molts que existeixen- \u00e9s el de refredament lent d\u2019una soluci\u00f3 sobresaturada. I el compost escollit pels organitzadors del concurs per a fer cristalls, tot i que existeixen infinitats de compostos cristal\u00b7lins, va ser l\u2019ADP (Dihidrogenfosfat d\u2019amoni).<\/p>\n<p>Un cop preparada la soluci\u00f3 sobresaturada d\u2019ADP, aquesta es deixa refredar 48 hores dins d\u2019un env\u00e0s de <em>porexpan<\/em> per aconseguir el refredament lent desitjat i que els cristalls tinguin suficient temps per anar formant-se: composicions cristal\u00b7lines, monocristalls, cristalls tintats amb colorants alimentaris \u2013que per cert, no tinten gens b\u00e9-, cristalls tintats amb colorants qu\u00edmics&#8230; Els alumnes esperen impacients que passin aquestes 48h per comprovar els cristalls que han obtingut. Que no s\u00f3n els esperats? Canviem les condicions: posem m\u00e9s o menys ADP, canviem l\u2019a\u00efllament, canviem el colorant&#8230; I aix\u00ed, en definitiva, \u00e9s com es fa ci\u00e8ncia i els alumnes xalen fent-ne.<\/p>\n<p><a href=\"https:\/\/drive.google.com\/drive\/folders\/1W5wFt1Go0w0yg9CIj_vmBm8LEoj2OL7P?usp=sharing\">m\u00e9s fotografies<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>VII Concurs de cristal\u00b7litzaci\u00f3 4 de maig de 2018 Com pot ser que a la qu\u00edmica se la conegui com a ci\u00e8ncia experimental \u2013mot que prov\u00e9 d\u2019experimentar\u2013 i els alumnes que cursen aquesta magn\u00edfica ci\u00e8ncia es puguin passar 6 anys estudiant-la sense realitzar pr\u00e0cticament cap experimentaci\u00f3 al laboratori? Aquesta va ser la premissa que ens [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":10912,"comment_status":"closed","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":[7,24,25,26,132,223],"tags":[],"class_list":["post-10911","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-eso-4","category-eso-4a","category-eso-4b","category-eso-4c","category-eso4d","category-experimentals"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/posts\/10911","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/comments?post=10911"}],"version-history":[{"count":1,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/posts\/10911\/revisions"}],"predecessor-version":[{"id":10913,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/posts\/10911\/revisions\/10913"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/media\/10912"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/media?parent=10911"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/categories?post=10911"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/insandreunin\/wp-json\/wp\/v2\/tags?post=10911"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}