http___www.jobstem.eu_novosti-1_params_post_1101699_ucenici-posjetili-fakultet-kemijskog-inzenjerstva-i-tehnologije_1.xml
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Students visit the Faculty of Chemical Engineering and Technology After the successful STEM intervention for fifth-grade students at the Faculty of Mechanical Engineering and Naval Architecture, it was sixth-graders' turn to visit the Faculty of Chemical Engineering and Technology at the University of Zagreb. Two forms from each experimental school were taken on a tour of three departments – Department of Organic Chemistry, Department of Analytical Chemistry and the Department of Mechanical and Thermal Process Engineering. In groups of ten, the students went through a myriad of interesting exercises, experiment and demos, with the guidance of the Faculty's professors and teaching assistants. For instance, they changed the color of water into purple, blue, green and yellow by using substances such as Manganese peroxide and adding sugar and alkaline crystals. They also had the task of uncovering a hidden picture drawn with colorless acid and alkali indicators, and is revealed by spraying it with an alkaline solution. Except from water, the students were also shown how to change the color of flame with the help of ethanol to which different chemical substances are added. Other interesting demos involved the quick dissolution of Styrofoam in acetone, using acetone and dry ice to decrease temperatures below 70 degrees Celsius and create artificial fog, and producing the so-called „elephant's toothpaste“ with the help of hydrogen peroxide, liquid soap and artificial coloring. At the Department of Analytical Chemistry, students heard a presentation about Teobroma caccao – the plant responsible for everyone's favorite sweet indulgence, chocolate. They learned about the step-by-step procedure used to ascertain the level of iron in chocolate, and how it relates to different qualities of specific types of the product. There was also talk about chromatography and how it can be used to discover the colors needed to produce different shades of felt-tip pens on paper, and make interesting colorful shapes. At the Department for Mechanical and Thermal Process Engineering, different varieties of crystals, such as snowflakes and salt crystals, were the main attraction: apart from hearing about them, students were also given the chance to observe them through microscopes. During these workshops, students were given the opportunity to get acquainted with Chemistry before its inclusion in their school curriculum, and to see how useful, as well as fun and interesting, it can be.
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Učenici posjetili Fakultet kemijskog inženjerstva i tehnologije Nakon uspješno provedene STEM intervencije za pete razrede na Fakultetu strojarstva i brodogradnje, prošli su tjedan šesti razredi osam osnovnih škola uključenih u JOBSTEM projekt posjetili Fakultet kemijskog inženjerstva i tehnologije Sveučilišta u Zagrebu. Po dva razreda iz svake škole obišla su tri fakultetska zavoda - Zavod za organsku kemiju, Zavod za analitičku kemiju te Zavod za mehaničko i toplinsko procesno inženjerstvo. Učenici su u manjim grupama, od po desetak djece, prolazili kroz niz zanimljivih vježbi, pokusa i demonstracija, uz vođenje profesora i asistenata fakulteta. Tako su mijenjali boju prvotno bistre vode u ljubičastu, zatim plavu, pa zelenu i žutu, primjenom tvari kao što je manganov peroksid, dodavanjem šećera i kristala lužine. Otkrivali su skrivenu sliku nacrtanu bezbojnim indikatorima na kiseline i lužine koja postane vidljiva kad ju se pošprica lužinom. Osim vode, učenici su vidjeli da mogu mijenjati i boju plamena primjenom etanola u kojem su otopljene različite kemijske tvari. Promatrali su kako se brzo može otopiti stiropor u acetonu i kako primjenom acetona i suhog leda možemo sniziti temperaturu do minus 70 te proizvesti umjetnu maglu. Jedan od zanimljivih pokusa bilo je i dobivanje tzv. slonovske paste uz pomoć vodikovog peroksida, deterdženta i umjetnog bojila. Na Zavodu za analitičku kemiju, učenici su slušali o Teobroma caccao - drvu kakaovca o čijoj kvaliteti ovisi kvaliteta mnogima najdražeg slatkiša – čokolade. Na ovoj su radionici učenici saznali kako korak po korak odrediti razinu željeza u čokoladi i tako saznati više o kvaliteti pojedinih vrsta čokolade. Naučili su također što je kromatografija i kako pomoću nje možemo otkriti od kojih se sve boja sastoje različite nijanse flomastera na papiru te na usput proizvesti zanimljive, šarene oblike. Na Zavodu za mehaničko i toplinsko procesno inženjerstvo govorilo se o različitim vrstama kristala kao što su snježne pahuljice ili kristali soli, a učenici su imali prilike i kristale proučavati kroz staklo mikroskopa. Kroz ove radionice, učenicima je kemija - koju tek trebaju početi slušati kao predmet u redovnoj osnovno-školskoj nastavi - prezentirana kao korisna, ali i iznimno zanimljiva i zabavna znanost koja je primjenjiva u mnogim područjima ljudske djelatnosti.