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Using a table of standard potentials you may notice that the value of the reduction potential of the water is higher, so it is easier to gain electron is reduced before forming hydrogen gas in the region of the cathode, negative (REVERSE BATTERY). This can be observed in the experiment with the release of bubbles, indicating the presence of a gas (H ) at the negative pole of the battery. The standard reduction potential of the water is higher than the potential of the iodine ion, so the water is easier to reduce electron does not lose easily. Thus, across the system oxidizes iodide ion before the water electron loses more easily. This can be easily recognized by brown color in the experiment characteristic iodine (I ) that appears across the system (electrode). ACTIVITY Proves the presence of iodine with the potato test. Collect gently with a pipette a small amount of brown substance that is forming the positive pole of the battery. And the ping in a potato. Notice what happened in the yellow mass of potato. You know that corrosion (oxidation reaction) of metals is also a stack? The corrosion of metals is a major problem for the man from the moment he managed to remove them from their ores. Corrosion is the reaction of a metal with environmental substances such as oxygen, and air humidity. Constantly we are witnessing the corrosion of the metal objects produced iron and steel (alloy + iron atom carbon atom), which is better known as rust. Rust is a substance obtained by a reaction similar to the foil with amalgam tooth fillings. ACTIVITY Get to know the chemical reaction that leads to rust and the process involved in it. Matter and Its Nature
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Koristeći tablicu standardnih potencijala koju ćete uočiti da je vrijednost potencijal smanjenja emisija u vode veća, tako da je lakše dobiti elektron je smanjen prije formiranja vodik u regiji katode, negativna (NAZAD baterija). To može biti promatrana u eksperimentu s izdavanjem mjehurića, što ukazuje na prisutnost plina (H ) kod negativnog pola akumulatora. Standardni potencijalno smanjenje vode je veća od potencijala joda iona, tako da je voda je lakše za smanjenje elektrona ne gubi lako. Dakle, preko sustava oksidira jodid iona prije nego voda elektron gubi lakše. To se lako može prepoznati po smeđoj boji u joda eksperimenta karakterističnim (I ) koji će se pojaviti preko sustava (elektrode). AKTIVNOST Dokazuje prisutnost joda s krumpira testa. Prikupiti nježno s pipetom male količine smeđe tvari koja se formira na pozitivan pol akumulatora. A ping u krumpiru. Obavijest ono što se dogodilo u žutom mase krumpira. Vi znate da korozije (oksidacije reakcije) metala je stog? U korozija metala je veliki problem za čovjeka od trenutka kada je uspio ukloniti ih iz njihovih ruda. Korozija reakcija metala s okoliša tvari kao što su kisik, i vlažnosti zraka. Stalno smo svjedoci koroziju metalnih predmeta proizvedenih željezo i čelik (legirani + željeza atom atom ugljika), koji je bolje poznat kao hrđa. Hrđa je tvar dobivena reakcija na sličnu foliju s amalgamskim zubnim nadjevima. AKTIVNOST Upoznajte kemijsku reakciju koja dovodi do hrđu i procesa koji su uključeni u to. materije i njezine prirode