Balancing Chemical Reactions

Front

How many Hydrogen are in 4H₂O?

Back

8

Front

Which of the following shows the correct way to balance the chemical equation?
Fe + O₂ -> Fe₂O₃
Options: 4Fe + 3O₂ -> 2Fe₂O₃, 2 Fe + 3O₂ -> Fe₂O₆, 4 Fe + O₆ -> 2Fe₂O₃, None of the options are correctly balanced.

Back

4Fe + 3O₂ -> 2Fe₂O₃

Front

Law of Conservation of Mass

Back

Matter cannot be gained or lost in a chemical reaction.

Front

Total number of atoms in 5Na₃PO₄

Back

40

Front

Balance this equation:
__P₄ + __O₂ --> __P₂O₃

Back

1, 3, 2

Front

Balance this equation
_Al +_HCl --> _H₂ +_AlCl₃

Back

2, 6, 3, 2

Front

Balance this equation.
_Mg + _Cl₂ --> _MgCl₂

Back

already balanced

Front

Balance this equation.
_CF₄ + _Br₂ -- _CBr₄ + _F₂

Back

1,2,1,2

Front

Which problem is balanced? Options: PbO₂ + 2H₂, SO₂ + H₂0 --> H₂SO₄, 2Na + 2H₂O --> 2NaOH + H₂

Back

2Na + 2H₂O --> 2NaOH + H₂

Front

Balance this equation.
SnO₂ + H₂ --> Sn + H₂O

Back

1,2,1,2