RECAPITULARE CL. 9
Authored by Berbece Lidia
Science
2nd Grade
Used 4+ times
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10 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Elementul chimic situat in grupa (13), perioada 3 are numarul atomic "Z"
11
12
13
14
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In molecula de apa intre atomii de hidrogen si oxigen se realizeaza:
o legatura covalenta dubla
cate o legatura covalenta polara
trei legaturi covalente simple
o legatura covalenta tripla
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Formula speciei chimice care prezinta numai legaturi covalente polare este:
NH4+
H3O+
NH3
MgCl2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Hipocloritul de sodiu are formula chimica:
NaClO4
NaClO3
NaClO
NaClO2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Dintre urmatoarele substante: NaCl, Cl2, HCl, H2 formeaza molecule polare:
Cl2
HCl
NaCl
H2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Apa prezinta punct de fierbere anormal de ridicat, deoarece:
contine oxigen
are moleculele asociate prin legaturi de hidrogen
contine hidrogen
are molecula polara
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In ecuatia reactiei chimice dintre clor si hidroxid de sodiu, cand NaOH are coeficientul 2, Cl2 are coeficientul stoechiometric:
2
0
1
3
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