Saturday, 26 December 2015

Reaction of Group 2 metals with oxygen:

Reaction of Group-2 metals with oxygen :
Hi fellows!!  This is Chemaddicts again to the solution. Today, we will discuss about the reaction of Gr-2 metals with oxygen.
So, let’s get started!!

Before going to the discussion of the reaction of Gr-2 metals with oxygen, we need to clear the confusion between the concept of burning metal and metal ions .
Most of the students mix up the concept of  burning metals and metal ions.
This is because most metals and metal ions in Gr-2 have same flame colour. There is a difference and we will see today:
Today, we will discuss the reaction of metals with oxygen gas:
All Gr-2 metals except Barium react with oxygen to give metal oxides whereas Barium reacts with oxygen to give Barium peroxide ( BaO2 ).
Equations for the reactions:

Here Mg burns with bright white flames.
Here, in this case , we are burning Mg not Mg ion . This is the difference here. Mg2+ ion have no flame colour. Don’t write the flame colour of Mg2+ ion as Mg metal.
Other Group-2 metals below Mg give the same colour as the metal cations. So, don’t get confused.



Here Ca burns with brick red flames like Ca2+ ions. 

Here Calcium metal will give the same colour as the Ca2+ ion.



Here Sr burns with crimson flames like  Sr2+ ions. 

Here Strontium metal will give the same colour as the Sr2+ ion.






(Here Ba burns with apple green flames like Ba2+ ions. )
Here Barium metal will give the same colour as the Ba2+ ion.

If you wanna have some other video tutorials, you will find them here:





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