Chemick\u00fd krou\u017eek oslavil rok sv\u00e9 existence a pokra\u010duje d\u00e1l ve sv\u00e9 \u010dinnosti i v leto\u0161n\u00edm \u0161koln\u00edm roce. Chce uk\u00e1zat, \u017ee chemie je zaj\u00edmav\u00e1, v\u0161udyp\u0159\u00edtomn\u00e1 a nenahraditeln\u00e1 a \u017ee nen\u00ed t\u0159eba se j\u00ed b\u00e1t. Prost\u0159ednictv\u00edm pokus\u016f n\u00e1m umo\u017e\u0148uje l\u00e9pe porozum\u011bt sv\u011btu okolo n\u00e1s. Kluci a d\u011bv\u010data, kte\u0159\u00ed r\u00e1di experimentuj\u00ed, kter\u00e9 bav\u00ed kl\u00e1st si ot\u00e1zky a hledat na n\u011b odpov\u011bdi, se sch\u00e1zej\u00ed op\u011bt v p\u00e1tek odpoledne. Za chemick\u00fdm b\u00e1d\u00e1n\u00edm p\u0159ich\u00e1z\u00ed 16 d\u011bt\u00ed z ni\u017e\u0161\u00edho gymn\u00e1zia.<\/p>\n
B\u011bhem prvn\u00edho m\u011bs\u00edce jsme si vyzkou\u0161eli z\u00e1kladn\u00ed chemick\u00e9 postupy, kter\u00e9 znali ji\u017e d\u00e1vn\u00ed alchymist\u00e9. Extrakci jsme zkusili na mrkvi. V\u00edte, pro\u010d je mrkev \u017elutooran\u017eov\u00e1? To m\u00e1 na sv\u011bdom\u00ed beta-karoten. Je nejen d\u016fle\u017eit\u00fdm provitaminem, ale tak\u00e9 n\u00e1padn\u00fdm pigmentem. Pat\u0159\u00ed do skupiny barviv, kter\u00e1 se naz\u00fdvaj\u00ed karotenoidy. A v\u00edte, jak lze beta-karoten z mrkve z\u00edskat? M\u016f\u017eete si jej z mrkve extrahovat. Bude se v\u00e1m hodit znalost, \u017ee karotenoidy jsou l\u00e1tky lipofiln\u00ed, tak\u017ee maj\u00ed r\u00e1di tuky. L\u00e9pe ne\u017e ve vod\u011b se beta-karoten rozpou\u0161t\u00ed v tuc\u00edch \u010di olej\u00edch. Pro sublimaci jsme vyu\u017eili Deko \u2013 ko\u0159en\u00edc\u00ed p\u0159\u00edpravek k nakl\u00e1d\u00e1n\u00ed okurek. Obsahuje kyselinu benzoovou, kter\u00e1 m\u00e1 konzerva\u010dn\u00ed \u00fa\u010dinky a um\u00ed tak\u00e9 sublimovat. P\u0159esublimovan\u00e9 krystalky kyseliny benzoov\u00e9 p\u0159ipom\u00ednaj\u00ed krystalky ledu. Ale proto\u017ee st\u00e1le obl\u00edben\u00e9 jsou krystaly modr\u00e9 barvy, nechyb\u011bla ani krystalizace roztoku modr\u00e9 skalice. Zjistlili jsme d\u00e1le, \u017ee n\u011bker\u00e9 chemick\u00e9 reakce se neobejdou bez katalyz\u00e1toru. A na vlastn\u00ed o\u010di jsme se p\u0159esv\u011bd\u010dili, \u017ee nejen chameleon, ale i chemick\u00e9 reakce mohou m\u011bnit barvu.<\/p>\n
Stejn\u011b jako loni se budeme cht\u00edt z\u00fa\u010dastnit t\u00fdmov\u00e9 chemick\u00e9 sout\u011b\u017ee Chem-quest po\u0159\u00e1dan\u00e9 V\u0160CHT Praha. Leto\u0161n\u00edm t\u00e9matem je Chemie a \u017eivotn\u00ed prost\u0159ed\u00ed. Ve\u0159ejnosti p\u0159edvedeme experimenty na Dnu otev\u0159en\u00fdch dve\u0159\u00ed. P\u0159ij\u010fte se pod\u00edvat!<\/p>\n
Martina Fialkov\u00e1<\/p>\n","protected":false},"excerpt":{"rendered":"
Chemick\u00fd krou\u017eek oslavil rok sv\u00e9 existence a pokra\u010duje d\u00e1l ve sv\u00e9 \u010dinnosti i v leto\u0161n\u00edm \u0161koln\u00edm roce. Chce uk\u00e1zat, \u017ee chemie<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":6848,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"ngg_post_thumbnail":0,"footnotes":""},"class_list":["post-7432","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/pages\/7432","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7432"}],"version-history":[{"count":1,"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/pages\/7432\/revisions"}],"predecessor-version":[{"id":7433,"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/pages\/7432\/revisions\/7433"}],"up":[{"embeddable":true,"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=\/wp\/v2\/pages\/6848"}],"wp:attachment":[{"href":"https:\/\/www.gymvla.cz\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7432"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}