Question

please can you anyone explain the concept of balancing equations? class 7 standard. I am unable to understand.​

Answer 1

Answer:

A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products. In other words, the mass and the charge are balanced on both sides of the reaction.

• The Law of conservation of mass governs the balancing of a chemical equation.
• According to this law, mass can neither be created nor be destroyed in a chemical reaction and obeying this law total mass of the elements or molecules present on the reactant side should be equal to the total mass of elements or molecules present on the product side.
• If the chemical equation is not balanced law of conservation is not applicable.

Example ⬇️

$P+O_2\ →\ P_2O_5$

No. of atoms of P & O should be equal on both sides

There are 2 atoms of oxygen on LHS and 5 on RHS

$P+5O_2\ →\ 2P_2O_5$

Now there are 4 atoms of P on RHS and 1 on LHS

Now the equation is

$4P+O_2\ →\ 2P_2O_5$

Explanation:

Hope it helps :-)

Answer 2

Answer:

sure! when you are balancing an equation, you just need to make sure that there is the same number of atoms of each element on both sides. lets try with an example, shall we?

Example:

lets say we have mg + o₂ = mgo

on the left side,

• mg = 1
• o = 2

whereas on the right side,

• mg = 1
• o = 1

mg is balanced, no need to touch it. lets multiply the o in the right hand side with 2.

but if we multiply it, we get 2mgo.

now, we have mg as 2 in the right hand side as well.

so now will multiply 2 with mg on the left hand side. we get

2mg + o₂ = 2mgo

you can see this is balanced.

one thing you should keep in mind is that you cant multiply in the subscript.

like, you cant write mg + o₂ = mgo₂ (its wrong)

always multiply as a coefficient (so the whole mgo is multiplied by 2)

and thats why we had to balance mg in the left hand side as well..

phew this was long! but i hope i helped you in any way! borahe!! :)