When is a chemical equation considered balanced?

Answer 1

The reason why Chemical equations are balanced is because each side of the equation must have the same amount of atoms, it is impossible to, for example, have this side with 3 O and that side with 4 O.

How to check:

Here's a really good and famous example(Guranteed your cehmistry teacher will mention this some day!):

CaO + H2O = Ca(OH)2

Is it balanced?

There's one Ca(Calcium) on one side, same with the other side. (Balanced!)

There's 2 Oxygen on one side, same with the other.(OH)2 Means two Oxygen, two Hydrogen.(Balanced!)

There's 2 Hydrogen on both sides as well(H2).

So the whole thing's balanced!

If it's not balanced, you can't change the numbers, you have to change the number in front. e.g. in the chemical equation of photosynthesis, there's a 6H2O. That means that there is 12 hydrogen and 6 Oxygen, change that "6" at the front to balance stuff. If there's no number at the front, that's the same as "1".

Answer 2

When the number of total repetitions, as indicated by explicit repetitions, subscripts, and/or coefficients when present, of each distinct atomic symbol is the same on both sides of a chemical equation, the equation is balanced.

Answer 3

A chemical equation is balanced when there is an equal amount of a chemical on both sides of the equation.

For example, look at this equation: Sr + Cl --> SrCl This equation is not balanced

First,

Sr + Cl --> SrCl2 The charge of Sr (strontium) is 2+ and the charge

of Cl (chlorine) is 1-. Thus, the chlorine must have

a subscript of 2.

On the right side of the equation, there are now 2 Cl's, and on the left side there is 1 Cl. In order for the sides to be equal, there must be 2 Cl's on each side of this equation.

So, you put a 2 in front of the Cl on the left.

Sr + 2Cl --> SrCl2 This equation is balanced

Now, there are two Cl's on each side, and there were already an Sr on each side, so the chemical equation is now balanced.

Answer 4

when there is the same number of each atoms/particle on the left as there is on the right

Answer 5

Same number of each kind of atoms appears in the reactants and in the products.

Answer 6

A chemical equation is balanced when the number of each kind of element on the left side of the yield sign is equal to the number of each kind of element on the right side.

Answer 7

A chemical equation is balanced when the mass of reactants is equal to the mass of products.

Answer 8

2Cu + S ---> Cu2 + S