A chemical equation is the chemical formula that provides the information of the elements and molecules that are reacting as well as the molecules that are being produced from that reaction. The Law of Conservation of Mass states that the mass of the reactants must balance the mass of the products. To balance a chemical equation, the atoms of both the elements and molecules on the reactant side (left side) and product side (right side) must be equal to each other.

You are watching: Which of the following is a correctly balanced equation?

In this instructable, you will understand and learn how to balance a chemical equation.

This instructable should take no longer than ten minutes.


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The unbalanced chemical equation is given to you.

Aluminum reacts with oxygen to produce aluminum oxide.

Rewrite the equation as shown above.


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First, identify the elements on the reactant side(left side) and the elements of the compound are on the product side (right side).

make a list of all of the elements on each side under the equation for both the reactants and products as shown aboveUnder the reactant’s side, list Al and Ounder the product’s side, list Al and O


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An atom is the smallest component of an element that contains chemical properties of that element. The atom of each element’s contains the protons, neutrons, and electrons of that element.

The list made of each element on both the reactant and product side will further help you identify the number of atoms each element contains.

Next to each element of the list, put the number of atoms that are in each of the elements.

on the reactants side, next to Al, put 1 next to O, put 2apply these same rules to each element on the product side


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Notice how the number of atoms next to each element is different from the number of atoms next to that same element on the product side.

In order to balance the chemical equation, you need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal.

As shown above, the multiplication of the atoms on the reactant side will affect both elements on the product side.


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After you have multiplied the number of atoms of each element until both sides are equal, you will put the number, the coefficient, of how much you multiplied the element by and place in front of that element or compound in the equation as shown above.

On the product side, although both elements did not get multiplied, still place the number that was multiplied as the coefficient in front of the compound.


After you have placed the coefficients in front of the molecules, make the list of elements again and check to see if multiplying the coefficient with the subscript will give you atoms equal on both the reactant and product sides.

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If they are not equal, rework your multiplication.


After you have reworked your multiplication, make the list of elements again to check to make sure the equation is balanced. If both sides are equal, you have now balanced the chemical equation!


Because it"s already written in front of "Al" so we don"t find it necessary to again write the coefficient in front of O also


this was honestly one of the most inspiring things i have ever seen.after seeing this i will change myself into a better person and be a great human being always looking to help others more than myself