
Ecuațiile reacțiilor chimice
Authored by Mioara Prepelita
Chemistry
8th Grade
Used 11+ times

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8 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Într-o reacție chimică se respectă
Legea conservării energiei
Legea lui Joule
Legea lui Lavoisier- Lomonosov
Legea lui Pascal
2.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
In ecuația reacției
Al2O3 +6 HCl =2 AlCl3 +3 H2O
Coeficienții sunt ( în ordine de la stânga la dreapta);
1,6,2,3
3,2,6,1
0,6,2,3
2,3,3,2
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Ecuația reacției de ardere a magneziului este
2Mg + O2 = Mg2O2
2Mg + O2 = MgO
2Mg + O2 = 2MgO
Mg + O = MgO
4.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Într-o reacție chimică substanțele care reacționează se numesc
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
În calculele chimice, pe ecuațiile stoechiometrice ale reacțiilor, se lucrează numai cu mase/cantități de substanțe
brute
pure
impure
soluții
6.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Coeficienții corespunzători pentru ecuația reacției chimice
Ba(OH)2 + H3PO4 → Ba3(PO4)2 + H2O
Sunt în ordine
3,2,1,6
3,1,1,3
3,2,1,3
3,1,1,2
7.
FILL IN THE BLANK QUESTION
1 min • 1 pt
Scrie cuvântul care lipsește.
Semnificația cantitativă a unei reacții chimice , la nivel macroscopic, indică numărul de............................ de reactanți și de produși de reacție
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