July 18, 2016

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Delia asked 5 years ago

 
1.Precizati afirmatiile corecte referitoare la o solutie de acid acetic de concentratie 6%:
a.Contine 0,1 moli de acid acetic dizolvat in 94 g de apa.
b.contine 0,6 moli de acid acetic dizolvat in 100 ml  de apa.
c.contine 0,6 g de  acid acetic in 10 g de solutie.
d.contine 0,001 moli de acid acetic dizolvat intr-un cm3 de apa.
e.contine 1 mol de acid acetic intr-un kg de solutie.
Ca raspunsuri corecte dau A,C,E. Insa mie mi se pare ca si D-ul e corect luand densitatea apei 1g/cm3. Explicatie de ce nu ar fi?
2. acidul 2-fenilacetic este considerat acid aromatic?
3. Precizati care dintre formulele moleculare enumerate mai jos pot corespunde unui compus din clasa fenolilor.
a.C10H8O
B.CnH2n-6O2
C.C10H12O
D.CnH2nO
E.C7H8O
Raspuns corect:A,B,E. De ce C-ul nu e bun?
4.Am gasit intr-o grila data ca falsa afirmatia: Valorile constantelor de bazicitate ale aminelor nu depind de temperatura. E corect?
5.In alta grila reactia 2-butanamina + HNO2 + HCl= 2-butanol+N2+ H2O e data ca raspuns corect.Eu am considerat ca reactia e incorecta pentru ca la produsi clorul nu mai apare. Se poate neglija?
6. Resturile alchil sunt doar cele care provin de la alcani? Adica,de exemplu, radicalul Ar-CH2- nu este alchil? Daca nu,atunci e considerat aril?
7.Care dintre urmatoarele alchene prezinta izomeri cis-trans:
a.1-butena
b.2-butena
c. 2-pentena
d.3-hexena
e.3-metil-3-hexena
Raspuns corect:B,C,D. de ce nu e luat si E-ul? Stiam ca alchenele care prezinta la cei 2 atomi de carbon dublu legati acelasi substituent izomerii lor geometrici se pot numi si cis-trans. In cazul E, sunt doi radical etil identici.

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1 Answers
Anonymous answered 5 years ago
  1. 0.06 g acid(md), 1,6 g solutie(ms), cp diferit de 6.
  2. Da.
  3. Si eu consider C-ul raspuns adevarat.
  4. Mi s-a spus ca intr-adevar depind de temperatura.
  5. Spune nr. grilei, te rog.
  6. Da. Nu. Nu stiu.
  7. Probabil e deja izomeria E/Z.

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