
SOLUBILITATE. pH - PARTEA I
Authored by IRINA MARIN
Science
9th Grade
Used 4+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Se consideră schema de reacții:
(1) 2H2O + 2Na → 2A + H2
(2) H2 + Cl2 → 2B
(3) A + B → NaCl+ H2O.
Este adevărat că:
substanța A are caracter acid
substanța B are caracter bazic
reacția (1) are loc cu schimb de protoni
reacția (3) are loc cu schimb de protoni
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Soluția apoasă a substanței HCl:
are caracter slab acid
conține și specia chimică H3O+
are [H3O+ ] < [HO- ]
se colorează în prezența fenolftaleinei
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Se consideră schema de reacții:
2H2O + 2Na → 2A + B↑
Cl2 + B→ 2D
Despre substanțele notate cu litere în schema de reacții este adevărat că:
substanța A este o bază slabă
substanța A este insolubilă în apă
substanța B este o substanță compusă
substanța D este un acid tare
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Referitor la substanța H2O, în stare pură și condiții standard
are pH = 7
formează specia H3O+ prin cedarea unui proton
conduce curentul electric
formează specia HO- prin acceptarea unui proton
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
O soluţie în care concentraţia ionilor hidroniu este mai mare decât concentraţia ionilor hidroxid are caracter acid.
A
F
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Acidul clorhidric este un acid mai tare decât acidul cianhidric
A
F
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
O soluție de compus NaOH, de concentrație 0,1 M are:
pH = 1
[H3O+ ] = [HO- ];
[H3O+ ] > [HO- ];
pH = 13
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