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School Are 78 giant pieces whose age ranges from 200 million to 1 billion years and whose weight ranges from 200 pounds to 4 tons. Have one feature in common: they are all Brazilian quartz stones. The glass, unlike the crystal, is one of the most beautiful creations of man unquestionable importance in our daily life, with endless applications in today's world. Traditionally, windows have been made from sand, silica and other compounds. Today for making glass heats silica (silicon oxide) with lime (calcium oxide) and ash (commercial name of sodium carbonate). The resulting glass is called CALCOSSODICO GLASS, and used in windows, bottles packaging, light bulbs, car headlights etc.. Combinations with other compounds are made to improve the properties of glass make it resistant to thermal shock and chemical attack, is more transparent and colored. The laboratory glass, Pyrex brand are borosilicate. Composition of about 4% Na and 80% silica, coupled with the manufacturing method allows supporting highly reactive and corrosive substances. The color of the glasses is also determined by the elements are added in small quantities to the original composition. These elements are dissolved in the glass and interact with the ambient light that falls on it, transmitting radiation of a given wavelength characteristic of a specific color. For example, the green color of most common glasses, windows, bottles are due to the presence of iron ions III. ACTIVITY The Hellmann exchange the glass by PET Mayonnaise Hellmann will no longer be sold in glass. A subsidiary of Anglo-Dutch Unilever has invested £ 7 million in the development of a transparent PET packaging, same material used in plastic soda bottles. All versions of the product that is 41 years in the Brazilian market (light, regular and lemon) pass into the plastic. According to the brand manager, Felipe Mendes, with the increasing number of women working outside the home, the care service identified consumer concern about the handling of the pot by children and Unilever decided by an unbreakable packaging, as used in Mexico and Argentina in the last five years. (TEXT REMOVED FROM THE INTERNET Source: Gazeta Mercantil-Industry and Services page. From the text, draw up questions on non-renewable resources and recycling glass. And then, at the end of the text, you already have an answer to the question of the beginning? Napoleon's horse was white even though the crystal is not crystal. Biogeochemistry
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Škola Jesu li 78 komada div čija dob varira 200 milijuna do bilijun godina i čija težina varira od £ 200 do 4 tone. Imati jednu zajedničku: oni su svi Brazilian kvarcni kamenje. Stakla, za razliku od kristala, jedan je od najljepših kreacija čovjeka neupitan značaj u našem svakodnevnom životu, s beskrajnim aplikacija u današnjem svijetu. Tradicionalno, prozori su izrađeni od pijeska, silicij i drugih spojeva. Danas za izradu staklo zagrijava silicij (silicij oksid) s vapnom (kalcijev oksid) i jasena (komercijalni naziv natrijevog karbonata). Razbijeno staklo se zove CALCOSSODICO STAKLO, a koriste se u prozore, boce pakiranju, žarulje, auto svjetla i sl.. Kombinacije s drugim spojevima su napravili za poboljšanje svojstva stakla čine ga otpornim na toplinski šok i kemijskom djelovanju, je transparentniji i boje. Laboratorij stakla, Pyrex marka su borosilikatnog. Sastav oko 4% Na i 80% silicij, zajedno s proizvodne metode omogućuje potporu visoko reaktivnih i korozivne tvari. Boja naočala također određuje se elementi dodaje u malim količinama u izvornom sastavu. Ti elementi su otopljeni u staklu i komunicirati s ambijentalnog svjetla koja pada na njega, emitira zračenje određenog valne duljine karakteristični za određenu boju. Na primjer, zelena boja najčešćih naočala, prozori, boce su zbog prisutnosti željeznih iona III. AKTIVNOST Hellmann Razmjena stakla strane PET Majoneza Hellmann više neće biti prodan u staklu. Podružnica Anglo-nizozemski Unilever uložio 7.000.000 £ u razvoju transparentan PET ambalaže, isti materijal koji se koristi u plastičnim bocama sodom. Sve verzije proizvoda koji je 41 godina u brazilskom tržištu (svjetlo, redovito i limun) proći u plastici. Prema brand manager, Felipe Mendes, s povećanjem broja žena koje rade izvan kuće, Spasa identificiran potrošača zabrinutost o rukovanju lonca od strane djece i Unilever odlučuje neraskidivu ambalaže, kao što se koristi u Meksiko i Argentina u posljednjih pet godina. (TEKST uklonjen iz INTERNET Izvor: Gazeta Mercantil-industriji i uslugama stranicu 12/03/04 19.). Iz teksta, sastavlja pitanja o neobnovljivih resursa i recikliranje stakla. I onda, na kraju teksta, već imate odgovor na pitanje od početka? Napoleonova konj je bio bijeli, iako je kristal nije kristalima. Biogeokemija