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Merykara
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PostPosted: Sun 7.1.2007 14:49    Post subject: Chemie Reply with quote

Prave resim se sestrou problem - mame seradit kovy od nejvic staleho na vzduchu po nejmene staly. muzete mi pomoct, prosim? Dogeyes
Au, Fe, Al, Na Question
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Lenore
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PostPosted: Sun 7.1.2007 16:07    Post subject: Reply with quote

Vždyť už jsou seřazený, ne? Laughing

I když s tím hliníkem a železem si nejsem jistá. Spíš bude stabilnější hliník.
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Merykara
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PostPosted: Sun 7.1.2007 16:09    Post subject: Reply with quote

ja jsem je tam naplacla, jak se mi chtelo. hlinik stabilnejsi bude, dela si takovou tu nejakou vrstvicku proti korozi. takze super, zahada vyresena Laughing
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Neahoo
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PostPosted: Mon 22.1.2007 21:50    Post subject: Reply with quote

Strasne blba otazka, ale trochu mi rozezrala ruku kyselina (jen malinka ranka, nic vic Wink ) a nechce se to hojit - nevite co na to namatlat? Embarassed
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Merykara
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PostPosted: Mon 22.1.2007 22:11    Post subject: Reply with quote

no ma se to umyt mydlovym roztokem, ale to ted uz asi nepomuze.
kdyz jsem se popatlala trichloroctovou, tak jsem to omyvala a omyvala, stipalo to a pak to bylo v pohode.
bohuzel vazne netusim. zazracny kelimek oriflame? Embarassed Laughing
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Neahoo
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PostPosted: Mon 22.1.2007 22:30    Post subject: Reply with quote

no ono uz je to dyl, ja to omyvala, omyvala, ale nic, ta kyselina byla asi moc koncentrovana (njn, jsem proste sikovna, delali jsme behem vyucovani protokoly na znamky a ja holt spechala Embarassed ). Jen jsem spis chtela vedet, jestli se to zahoji nebo jsem si to tam vytetovala nadobro. Ale hlavne asi nejak zvlhcovat, ne? Mne se zda ze je to spis cim dal horsi. Aspon ze jsem z toho protokolu pak mela plnej pocet, tak mi to za to stalo Laughing
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Merykara
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PostPosted: Mon 22.1.2007 22:32    Post subject: Reply with quote

ja nevim, ja mela jenom takovy cerveny fleky po cely noze. nedovedu si primo predstavit, jak to vypada a nevim, jestli by se to melo zvlhcovat. zkus se zeptat zitra chemikarky.
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Zenoa
25.9.2002


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PostPosted: Tue 23.1.2007 11:29    Post subject: Reply with quote

já na sebe taky jednou něco chrstla, propálilo mi to kůžu na ruce, ale jenom takovej malej flíček. Nechala jsem to, ta spálená kůže se postupně odloupávala a pak se to zahojilo úplně. ale malinko to jde vidět i teď , je to takový světlejší.
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PostPosted: Fri 26.1.2007 20:36    Post subject: Reply with quote

Prosím o radu, jak spočítat tento příklad: Kolik kg škrobu lze získat z 1 tuny brambor, které obsahují 18% škrobu při 70% výtěžku?
Děkuji!
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smain
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PostPosted: Fri 26.1.2007 20:53    Post subject: Reply with quote

Anonymous wrote:
Prosím o radu, jak spočítat tento příklad: Kolik kg škrobu lze získat z 1 tuny brambor, které obsahují 18% škrobu při 70% výtěžku?
Děkuji!


řekl bych, že asi tak: 1000x0,7x0,18
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Daimler
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PostPosted: Fri 26.1.2007 21:04    Post subject: Reply with quote

to vyřeším aji já..
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PostPosted: Wed 31.1.2007 17:16    Post subject: Reply with quote

víte někdo jak se vyrábí poloacetal a acetal???? Dogeyes
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PostPosted: Wed 31.1.2007 18:14    Post subject: Reply with quote

a ještě acetofenon a cyklohexanon (ketony) dík
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Zenoa
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PostPosted: Wed 31.1.2007 19:08    Post subject: Reply with quote

cyklohexanon - Vyrábí se například hydrogenací fenolu nebo dehydrogenačí cyklohexanolu.
Zkus google
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Lucrezia
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PostPosted: Wed 31.1.2007 23:02    Post subject: Reply with quote

Anonymous wrote:
víte někdo jak se vyrábí poloacetal a acetal???? Dogeyes

ja to vim Mr. Green vim, kde to v sesite najit
Poloacetal vznika reakci karbonylove slouceniny s alkoholem. Vypada to C(H)2(OH)(OR)
Acetal vznikne odstepenim vody z poloacetalu a naslednou reakci opet s alkoholem. Vypada to C(H)2(OR)2 - snad je to trochu srozumitelny.
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