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This is quite simple, you count up the number of ATOMS on each side of the "=>" sign, the rules for this are:-

  1. In a chemical formula a "letter or symbol for an atom of an Element" followed by a number (usually expressed as a subscript) denotes how many ATOMS of that element are present in that molecule.
  2. A number before a "formula for a compound or molecule" denotes the number of those molecules present.
  3. The mathematical symbol "+" shows which groups of molecules are present in the equation.

Thus:-

The balanced equation for the formation of water from its elemental components (gaseous Hydrogen and gaseous Oxygen) is:-

2H2+O2 => 2H2O

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Using the rules 1-3 above we can see that the products (after the "=>") of the reaction, contain 2 ATOMS of Hydrogen and 1 ATOM of Oxygen - H2O, but that there are two water molecules present making 4 ATOMS of Hydrogen and 2 ATOMS of Oxygen - a total of 6 ATOMS.

Now looking at the reactants (before the "=>") we see that hydrogen and Oxygen gases are "diatomic" (this means that the molecule contains 2 a pair of ATOMS) - H2 and O2. Thus if you reacted one Hydrogen molecule with one Oxygen molecule you would use up all the Hydrogen but only one of the Oxygen ATOMS. Thus you would need TWO Hydrogen molecules to use up all the Oxygen - thus the "2" in front of the "H2". So adding up all the reactants' ATOMS, we get 4 Hydrogen ATOMS and 2 Oxygen ATOMS - a total of 6 ATOMS.

Thus we can write

2 molecules of Hydrogen and 1 molecule of Oxygen which contain 6 ATOMS, 4 of Hydrogen and 2 of Oxygen reacted to produce 2 molecules of Water which contain 6 ATOMS, 4 of Hydrogen and 2 of Oxygen.

There are the same number of ATOMS either side of the equation AND the same number of ATOMS for EACH ELEMENTeither side of the equation. This means the equation is balanced. This has to be because matter can neither be created or destroyed in normal circumstances.

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What is balanced chemical equations demonstrate?

Balanced chemical equations demonstrate the conservation of mass and atoms in a chemical reaction. They show the ratio of reactants and products involved in a reaction and help predict the outcomes of chemical reactions.


Properly balanced equations are necessary for what?

Properly balanced equations are necessary in chemistry to accurately represent the conservation of mass and atoms in a chemical reaction. Balanced equations ensure that all reactants are accounted for and that the number of atoms remain the same on both sides of the reaction.


What is a balanced chemical equation Why should chemical equations be balanced?

A balanced equation is when the amount of molecules reacting are equal to the amount of molecules being produced. Chemical equations must be balanced because no energy/mass is ever lost when a reaction takes place. This is because atoms are simply arranged.


Why are chemical equations always balanced?

Chemical equations are always balanced to satisfy the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Balancing equations ensures that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side.


How Chemical equations are balanced by changing the subscripts of the molecule true or false?

False. Chemical equations are balanced by changing the coefficients in front of the chemical formulas, not the subscripts within the formulas. The number of atoms of each element must be equal on both sides of the equation to ensure that mass is conserved.

Related Questions

What is balanced chemical equations demonstrate?

Balanced chemical equations demonstrate the conservation of mass and atoms in a chemical reaction. They show the ratio of reactants and products involved in a reaction and help predict the outcomes of chemical reactions.


Balanced chemical equations demonstrate?

the law of conservation of mass.


Is chemical equations required to be balanced?

Yes, chemical equations must be balanced due to the law of conservation of matter/mass.


What is a chemical equation balanced does it show?

Chemical equations are representative for chemical reactions.


What do balanced and unbalanced chemical equations share in common?

Both balanced and unbalanced chemical equations represent the chemical reactions that take place between reactants to form products. The key difference is that balanced equations have an equal number of atoms of each element on both sides, while unbalanced equations do not.


Are chemical equations balanced by changing the subscripts of the molecules?

No - they are usually balanced by changing the numbers before the molecules.


What is ionic?

Ionic equations are a special type of chemical equations that demonstrate the changes in oxidation numbers in particular ions.


Properly balanced equations are necessary for?

They are necessary for accurate chemical calculations.


Properly balanced equations are necessary for what?

Properly balanced equations are necessary in chemistry to accurately represent the conservation of mass and atoms in a chemical reaction. Balanced equations ensure that all reactants are accounted for and that the number of atoms remain the same on both sides of the reaction.


What is a balanced chemical equation Why should chemical equations be balanced?

A balanced equation is when the amount of molecules reacting are equal to the amount of molecules being produced. Chemical equations must be balanced because no energy/mass is ever lost when a reaction takes place. This is because atoms are simply arranged.


Is this true about balanced chemical equations that they provide the molar ratios of reactants and products in chemical reactions?

Yes.


Why are chemical equations always balanced?

Chemical equations are always balanced to satisfy the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. Balancing equations ensures that the number of atoms of each element on the reactant side is equal to the number of atoms of the same element on the product side.