{"id":2502,"date":"2018-02-05T13:18:24","date_gmt":"2018-02-05T12:18:24","guid":{"rendered":"http:\/\/agora.xtec.cat\/esc-elfar\/?p=2502"},"modified":"2018-02-05T13:20:02","modified_gmt":"2018-02-05T12:20:02","slug":"els-colorants","status":"publish","type":"post","link":"https:\/\/agora.xtec.cat\/esc-elfar\/nivells\/els-colorants\/","title":{"rendered":"Els colorants"},"content":{"rendered":"

L’experiment que vam realitzar els alumnes de cicle mitj\u00e0 la setmana passada va ser senzill per\u00f2 molt vist\u00f3s!<\/p>\n

Vam necessitar pocs elements i estris: paper de cuina absorbent, colorants, gots de pl\u00e0stic, pipetes i aigua.<\/p>\n

En un got vam dipositar colorant blau i vermell i a l’altre verd i vermell; vam ser molt minuciosos a l’hora de contar les gotes de cada color, perqu\u00e8 funcion\u00e9s havien de ser exactament les mateixes. Un cop realitzades les barreges dels colorants, vam posar una gota de cada barreja en el centre d’un tros de paper de cuina. Passats uns minuts, vam afegir un gota d’aigua sobre cada barreja. Vam anar afegint gotes d’aigua curosament fins que… vam comprovar com comen\u00e7aven a separar-se els colorants!<\/p>\n

L’Alba i La Laura ens van explicar que l’aigua actua com a dissolvent. El paper fa de vehicle on la barreja va avan\u00e7ant per capil\u00b7laritat. Es separen els dos components de la barreja de colorants i, per tant, no es produeix cap reacci\u00f3 qu\u00edmica. Ara b\u00e9 el procediment que succe\u00efx \u00e9s el fonament de la cromatografia, una t\u00e8cnica de separaci\u00f3 de subst\u00e0ncies pures de les barreges. Genial i molt visual, comproveu-ho!<\/p>\n

\"\"<\/a><\/p>\n

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

L’experiment que vam realitzar els alumnes de cicle mitj\u00e0 la setmana passada va ser senzill per\u00f2 molt vist\u00f3s!
\nVam necessitar pocs elements i estris: paper de cuina absorbent, colorants, gots de pl\u00e0stic, pipetes i aigua.
\nEn un got vam dipositar colorant blau i vermell i a l’altre… Llegeix m\u00e9s\u00bb<\/a><\/p>\n","protected":false},"author":7,"featured_media":2517,"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,"footnotes":""},"categories":[109,1],"tags":[74,75,71,61,55],"class_list":["post-2502","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-experimentacio","category-nivells","tag-3r","tag-4t","tag-cm","tag-primaria","tag-experimentacio"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/posts\/2502","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/comments?post=2502"}],"version-history":[{"count":3,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/posts\/2502\/revisions"}],"predecessor-version":[{"id":2519,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/posts\/2502\/revisions\/2519"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/media\/2517"}],"wp:attachment":[{"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/media?parent=2502"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/categories?post=2502"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/agora.xtec.cat\/esc-elfar\/wp-json\/wp\/v2\/tags?post=2502"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}