Question

Which equation is balanced?

Answer 1

Answer:

2Na+F2 yields 2NaF is balanced.

Explanation:

There are 2 sodium and 2 fluorine in both reactants and product: In 2NaF the 2 is distributed because it is in the beginning of the compound.

Answer 2

Answer : The correct balanced chemical equation will be, $2Na+F_2\rightarrow 2NaF$

Explanation :

Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.

If the amount of atoms of each type on the left and right sides of a reaction differs then to balance the equation by adding coefficient in the front of the elements or molecule or compound in the chemical equation.

The coefficient tell us about that how many molecules or atoms present in the chemical equation.

Part 1 :

The given chemical reaction is,

$2Al+3O_2\rightarrow Al_2O_3$

This reaction is an unbalanced chemical reaction because in this reaction number of aluminium and oxygen atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $Al_2O_3$, the coefficient '3' put before the $O_2$ and the coefficient '4' put before the $Al$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$4Al+3O_2\rightarrow 2Al_2O_3$

Part 2 :

The given chemical reaction is,

$2Al+F_2\rightarrow AlF_3$

This reaction is an unbalanced chemical reaction because in this reaction number of aluminium and fluorine atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $AlF_3$ and the coefficient '3' put before the $F_2$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$2Al+3F_2\rightarrow 2AlF_3$

Part 3 :

The given chemical reaction is,

$Mg+O_2\rightarrow 2MgO$

This reaction is an unbalanced chemical reaction because in this reaction number of magnesium atoms are not balanced.

In order to balance the chemical equation, the coefficient '2' put before the $Mg$ then we get the balanced chemical equation.

The balanced chemical reaction will be,

$2Mg+O_2\rightarrow 2MgO$

Part 4 :

The given chemical reaction is,

$2Na+F_2\rightarrow 2NaF$

This reaction is a balanced chemical reaction because in this reaction the number of atoms are balanced of both side of the reaction.

Hence, the correct balanced chemical equation will be, $2Na+F_2\rightarrow 2NaF$