17.03.2018., subota

How much Physics in Chemistry? Dana 28.veljače, održana je radionica iz Fizike i Kemije na temu How much Physics in Chemistry? Radionica je bila namijenjena učenicima šestih razreda. Učenici su pomoću pribora koji se koriste i u Kemiji i u Fizici izvodili sljedeće pokuse: a) određivanje obujma nepravilnog tijela Učenicima je ponuđeno nekoliko tijela nepravilnog oblika (kamen, uteg i komad plastelina). Učenici su određivali obujam zadanih tijela koristeći se principom Arhimedovog zakona. Kao mjerni instrument ponuđena im je menzura s vodom. Učenici su samostalno, metodom pretpostavki; došli do zaključka kako izmjeriti obujam nepravilnog tijela uranjanjem u vodu. Kasnije su mijenjanjem oblika plastelinu, provjerili utječe li promjena oblika tijela na promjenu obujma. b) toranj gustoće Učenici su od kuće donijeli nekoliko tekućina različitih boja. Cilj ovoga pokusa je bio da pokušaju uliti što više različitih tekućina u menzuru bez da se one pomiješaju. Koristili smo: vodu, ulje, sredstvo za pranje suđa, antifriz i šampon. Ulijevajući razne tekućine u menzuru one ostaju u slojevima zbog različitosti svojih gustoća. c) provodljivost krutih tvari i tekućina Učenici su zatvarali strujni krug s predmetima iz svojih pernica. Zaključili su da metali dobro provode struju. Zatim su ispitivali provodljivost različitih tekućina. Primijetili su da voda bolje provodi struju ako se posoli, također su uočili se na jedan od vodiča skupljaju mjehurići. Kada su ispitivali provodljivost vodene otopine modre galice na jedan uronjeni vodič stavili su novčić. Novčić je postao bakren razlaganjem kemijskog spoja vodene otopine modre galice pomoću struje na elemente. Pokuse osmislile nastavnica fizike Martina Bukvić i nastavnica kemija Ivana Kotarski Milek On 28th of February there was a workshop for 6th grade students with the topic ‘How much Physics in Chemistry?’ Students used equipment that is used in both physics and chemistry to conduct the following experiments: a) Detection of the volume of an irregular body Students were offered a few irregularly shaped bodies (a rock, a weight, a piece of plasticine) and they were supposed to detect the given bodies volume by using the principle of the Archimedes law. They were also given a graduated cylinder with water as a measuring instrument. Students came to their conclusions independently by using the method of assumption and they realized that they should put the object in water and then measure its volume. Later on, they changed the shape of the plasticine and checked if it influences the volume of the irregular body. b) Tower of density Students brought a few differently colored liquids from home and the goal of this experiment was to put in as many different liquids as possible in the graduated cylinder without them mixing. We used: water, oil, dish soap, shampoo and antifreeze liquid. Pouring in different types of liquids makes them stay in layers because each of them has different density. c) Conductivity of solids and liquids Students closed the electric circuit with various objects out of their pencil cases. They realized that metals conduct electricity the best. Then they examined the conductivity of different liquids. The students noticed that water will conduct electricity better if they put a little salt in it and they also noticed that bubbles appear with one of the conductors. When they examined the conductivity water solution of cupric sulfate anhydrous on one of the immersed conductors they put a coin on it. The coin became copper because of the decomposition into elements of the chemical compound of water solution of cupric sulfate anhydrous by using electricity. The experiments were created by Physics teacher Martina Bukvić and Chemistry teacher Ivana Kotarski Milek

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