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art.work
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Post Posted: 20-01-2011, 12:12:29 | Translate post to: ... (Click for more languages)

de la 5 la 11 tot ce se poate




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hNs # gen0-

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Post Posted: 20-01-2011, 20:55:22 | Translate post to: ... (Click for more languages)

HAHAHA pe mn m-a ascultat azi de la 1-3 si am luat 10 -)

 
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Ceea ce ai postat tu e ultimul lucru care l-ar putea interesa. Omul are nevoie de ajutor, abtine-te.





dnd...doar PsychoBoT
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art.work
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Post Posted: 22-01-2011, 19:19:44 | Translate post to: ... (Click for more languages)

up , macar o problema doua.


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VM

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Post Posted: 22-01-2011, 21:00:30 | Translate post to: ... (Click for more languages)

1. a)3 etil 1 butina , 3,3 dimetil 1 butina , 2 pentina, 4 metil 1 butina b)1 2 4
2. foloseste exemplu de la 1.a)
3.idem
4.A=acetilena , vezi in carte reactiile alchinelor cu reactivul Tollens
4.b) folosesti randamentu si puritatea si calc cu regula de 3 simpla , apoi calculezi pe baza stoechiometriei reactiilor(atentie cum egalezi reactiile)
5.ar trebuii sa fie ceva ex de calcul in carte(formula) .. pe baza masei moleculare si gradului de nesaturatie determini care ii exact formula moleculara
6. pornind de la acetilena .. hidrogenare obtii etena si apoi sunt ceva reactii de oxidare prin care sa obtii etanal(vezi carte .. reactii de oxidare a alchenelor)
7.carbid = carbura de calciu
reactia CaC2+2H2O=C2H2+Ca(OH)2
pe baza stoechimoetriei determini puritatea
b)faci reactia cu Br2(aq) de conc 2% si pe baza stoech determini masa pura de Br2 apoi pe baza puritatii calc cu regula de 3 simpla masa totala de solutie apoasa de brom

La 8 9 10 11 mi destul de greu sa iti explic pe forum -

Nu mai stiu exact toate formulele si metodele de calcul ca is in anu 4 la Inginerie Chimica si n-am mai facut treburile astea din cls a 12a

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Neverfear

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Post Posted: 26-01-2011, 20:53:04 | Translate post to: ... (Click for more languages)

jos palaria pt VM!
Ti'as da rep:P
Incearca sa faci proiecte daca nu stii chimie bine:-??
Pe noi asa ne'a trecut

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VM

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Post Posted: 26-01-2011, 22:58:32 | Translate post to: ... (Click for more languages)

mai bine invatati macar lucrurile elementare..ii foarte usoara materia -
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bKL

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Post Posted: 30-01-2011, 20:41:18 | Translate post to: ... (Click for more languages)

VM wrote:
mai bine invatati macar lucrurile elementare..ii foarte usoara materia -


crezi ca ai putea sa imi dai si mie niste meditatzii la chimie ? e cea mai mica medie &&& de materie -



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VM

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Post Posted: 01-02-2011, 10:10:22 | Translate post to: ... (Click for more languages)

pai urmeaza exemplul lui art .. baga niste probleme aici .. sau lucruri pe care nu le pricepi si te ajut cu cea mai mare placere
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Tribald

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Post Posted: 28-03-2011, 19:12:39 | Translate post to: ... (Click for more languages)

VM ,vezi ca la prima nui 3 etil butina e 3 metil pentina ca se ia catena cea mai luna care este (in jos) si nu in dreapta - peste celelalte nu mam uitat
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VM

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Post Posted: 30-03-2011, 07:16:08 | Translate post to: ... (Click for more languages)

ai dreptate..n-am fost atent
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dumitru tudor

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Post Posted: 22-06-2011, 10:16:46 | Translate post to: ... (Click for more languages)

Un amestec de etan, etenã ºi hidrogen în raport molar 2:2:3 se trece peste un
catalizator de platinã sub presiune ºi la temperaturã ridicatã. Scrieþi ecuaþia reacþiei
chimice care are loc

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VM

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Post Posted: 29-07-2011, 08:46:13 | Translate post to: ... (Click for more languages)

hidrogenarea etenei .. etanul nu reactioneaza
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