What is the formula of sodium oxide

 



Exercises for setting up reaction equations

When setting up reaction equations in chemistry (8th grade curriculum), you should follow these steps:


Reaction of an alkali metal with oxygen      

Example:
Sodium and oxygen react to form sodium oxide

1)Establish word equation.
 Sodium + oxygenSodium oxide

2)Use symbols and formulas
  Important: Note that all gaseous elements (except noble gases) occur as diatomic elements !!


Na + O2 N / A2O

3) Establish reaction equation
 

 Important: The number of atoms of an element must be the same on the left and right side of the reaction arrow.

4 Well + O2  
 
2 Well2O
+
 
      

Left:

 right:
4 sodium atoms
2 oxygen atoms
 4 sodium atoms
2 oxygen atoms

Note:O2 means that 2 atoms are bound in a molecule
2 Well2O means that 1 mol of 2 Na2O is present.
Note: In a chemical reaction, it is not the atoms that change; the atoms are simply linked to one another in a different way. (see Dalton's atomic theory)

It is said: 4 moles of sodium react with 1 mole of oxygen to form 2 moles of sodium oxide.

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