Why is it necessary to balance chemical eqation?

Answer 1

The balanced form of the chemical reaction reveals what is called the stoichiometry of the reaction. The stoichiometry tells you about the relationship between how many molecules of products will be produced for each molecule of reactant. Why is that useful? Let's use the following made up reaction: A + 2B --> C That means that two molecules of B are necessary to combine with one molecule of A to make one molecule of C. So if I want to make 100 molecules of C, I'll need to start with 100 molecules of A and 200 molecules of C. I could also think about it the other way: If I have 50 molecules of A and 100 molecules of B, how much C can I make? Now I can make 50 molecules of C, right? There are a number of other ways to use stoichiometry as well. Another aspect is that mass is always preserved. What that means is that atoms can't just disappear! If an atom goes into a reaction as a reactant, it will come back out as a product. Every time. The balanced reaction is written so that everything that goes in comes out.

Answer 2

I too am a student in 8th grade who wants to ask the same question.

But, i believe that they have to be balanced in order to know that they are in propotion. Therefore, there result as product from reactant really has the relationship.

Answer 3

It so much important to balance a chemical equation so that it will not violate the Law of conservation of mass.

Law of conservation of mass:Mass is neither created nor destroyed but is changed to another form only.

Let us see a chemical reaction between magnesium with oxygen:

Mg + O2 ---> MgO

It is not balanced so it violates the law.

2Mg + O2 ----> 2MgO

This is balanced and is not violating the law.

Therefore it is so much necessary to balance a chemical reaction.

Answer 4

Balancing chemical equations is necessary due to the law of conservation of matter/mass, which states that in a chemical reaction matter is neither created nor destroyed. This means that the numbers of atoms for each element must be the same on both sides of the equation.

Answer 5

Conservation of the numbers of atoms of each element.