evaluare sumativa clviiia apa.solutiile.disociatia electrolitica
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evaluareTRANSCRIPT
Clasa aVIII-a N.P.E.___________________________________________Timp de lucru-40min. ___________ __________ ____________
Data organizării Scor total Nota acordată
Test de evaluare sumativăla chimie la tema”Apa.Soluţiile.Disocierea electrolitică.”
Varianta I
Nr. Itemi Scor
1 Completează spaţiile libere din propoziţiile de mai jos:a) Solluţia este un_______________ omogen, ce conţine________________şi _____________________________ .
b) Sînt electroliţi substanţele care în soluţie sau topitură _________________________________________________.
c) La disocierea acizilor se formează cationi de __________________şi anioni de _______________________ .
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2 Notează prin A, dacă afirmaţia este corectă, prin F-falsă
A / F Cationii sînt ionii cu sarcină pozitivă;
A / F Nitratul de bariu este o substanţă insolubilă;
A / F Un mol de clorură de calciu la disociere formează un mol de ion de calciu şi doi moli ioni de clor;
A / F Oxidul de carbon ( IV) este un oxid basic.
3 Termină ecuaţiile reacţiilor ce prezintă proprietăţle chimice ale apei. Stabileşte coeficienţii. Numiţi substanţele obţinute.
1. Na + H2O _________________________________________
2. CO2 + H2O __________________________________________
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3. CaO + H2O _________________________________________
Soluţiile se obţin la amestecarea: a) apei şi nisipului
b) apei şi uleiului
c) apei şi alcoolului
d) apei şi sării de bucătărie5 Rezolvă problema:
Calculează ce masă de sare şi ce masă de apă sînt necesare pentru a prepara 400g soluţie de clorură de calciu în care partea de masă a clorurii de calciu este de 25%. Se dă: Rezolvare:_______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________Răspuns:_________________________________________________________
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6 Scrie ecuaţiile moleculare, ionice complete şi ionice reduse ale reacţiilor
posibile ce au loc dacă amestecăm pe rînd soluţiile următoarelor substanţe.
HCl, K2CO3, Ba(OH)2, Fe(NO3)3, Na2O.
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Clasa aVIII-a N.P.E.___________________________________________Timp de lucru-40min. ___________ __________ ____________
Data organizării Scor total Nota acordată
Test de evaluare sumativăla chimie la tema”Apa.Soluţiile.Disocierea electrolitică.”
Varianta II
Nr. Itemi Scor
1 Completează spaţiile libere din propoziţiile de mai jos: a) Bazele sînt_____________________ care la disociere formează cationi de___________________ şi anioni de____________________________.b) Substanţele care în soluţie sau topitură nu conduc curentul electric se numesc __________________________.c) Reacţiile de scimb ionic decurg pînă la capăt dacă se obţine________________sau se degajă ___________________sau_______________________________.
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2 Notează prin A, dacă afirmaţia este corectă, prin F-falsă
A / F Carbonatul de calciu este o sare bine solubilă în apă;
A / F Un mol de acid sulfuric la disociere formează doi moli de ioni de hidrogen şi un mol de ion sulfat;
A / F Cationul de sodium are sarcină pozitivă;
A / F Oxidul de sodium este un oxid acid.
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3 Termină ecuaţiile reacţiilor ce prezintă proprietăţle chimice ale apei. Stabileşte coeficienţii. Numiţi substanţele obţinute.
1. Ca + H2O ____________________________________________
2. Na2 O + H2O ___________________________________________
3. SO3 + H2O ____________________________________________
4 Emulsiile se obţin la amestecarea:
a) apei şi benzinei
b) apei şi oţetului
c) apei şi uleiului
d) apei şi zahărului
5 Rezolvă problema: Calculează ce masă de sare şi ce masă de apă sînt necesare pentru a prepara 250g soluţie de carbonat de sodiu în care partea de masă a carbonatului de sodiu este de 20%. Se dă: Rezolvare:_____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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6 Scrie ecuaţiile moleculare, ionice complete şi ionice reduse ale reacţiilor
posibile ce au loc dacă amestecăm pe rînd soluţiile următoarelor substanţe.
CuSO4, Na2CO3, NaOH, H2SO4, CO2.
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