Balancing chemical reactions

Front

How confident are you in balancing equations?

Back

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Front

(NH₄)₂Cr₂O₇ How many H are in this atom?

Back

8

Front

PCl₅ +H₂O --> POCl₃ +HCl. How many chlorine (Cl) atoms are in the reactants and products?

Back

Reactants 5: Products 4

Front

Which option is correctly balanced?
Options:

Fe + H₂O --> Fe₃O₄ + H₂

,

3 Fe + H₂O --> Fe₃O₄ + H₂

,

3 Fe + 4 H₂O --> Fe₃O₄ + 4 H₂

,

3 Fe + 2 H₂O --> Fe₃O₄ + H₂

Back

3 Fe + 4 H₂O --> Fe₃O₄ + 4 H₂

Front

Which Option is Correctly Balanced?
Options:

Hg + O₂ --> Hg₂O₂

,

2 Hg + 2O₂ --> Hg₂O₂

,

2 Hg + O₂ --> Hg₂O₂

,

Hg + 2 O₂ --> Hg₂O₂

Back

2 Hg + O₂ --> Hg₂O₂

Front

In chemical reactions, what does the principle of conservation of mass mean?

Back

Matter is not created or destroyed.

Front

How many atoms of Carbon are in the formula 3C₂H₆?

Back

6

Front

Coefficients to balance: __Na + __F₂ → __NaF

Back

2, 1, 2

Front

Coefficients to balance: __Na + __MgF₂ → __NaF + __Mg

Back

2, 1, 2, 1

Front

Balance the equation: ___N₂ + __H₂ → __NH₃

Back

1,3,2