Ecuatia reactiei chimice- stabilirea bilantului atomilor
Authored by Manuela Donici
Chemistry
8th Grade
Used 24+ times
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15 questions
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1.
MULTIPLE SELECT QUESTION
1 min • 1 pt
In 3 molecule de acid sulfuric se gaseste un numar de atomi calculat astfel:
3 H2SO4 = 3 x 2 at H + 3 x 1 at S + 3 x 4 at O
3 H2SO4 = 3 x 2 at H + 3 x 4 at S + 3 x 4 at O
2 H2SO4 = 2 x 2 at H + 4 x 1 at S + 2 x 4 at O
5 H2SO4 = 5 x 2 at H + 5 x 1 at S + 5 x 4 at O
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Pentru scrierea 4 H2O cifra 4 este:
indice
coeficient chimic
numarul atomilor de oxigen
numarul atomilor de hidrogen
3.
MULTIPLE SELECT QUESTION
1 min • 1 pt
Reactia chimica scrisa corect este:
Ca + S = CaO
S + Ca = CaO
Ca + S = CaS
2 Ca + S = CaS
4.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Scrie numarul de atomi de fosfor din Ca3(PO4)2 :
(a)
5.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Scrie numarul de atomi de oxigen din Ca3(PO4)2 :
(a)
6.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Scrie numarul de atomi de fosfor din 2 Ca3(PO4)2 :
(a)
7.
FILL IN THE BLANKS QUESTION
1 min • 1 pt
Scrie numarul de atomi de oxigen din 4 Ca3(PO4)2 :
(a)
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