Decomposition Reactions Video Lecture | Chemistry Class 11 - NEET

welcome to electron line and our next
oxidation reaction reduction reaction
we're going to look at is what we call
the decomposition reaction which is the
exact opposite of the composition
reaction or the combination reaction and
what that means is that we take in a
molecule and we decompose it into two
it's separate elements so here we have
water h2o and the oxidation state of
hydrogen is plus one oxygen minus two
when they separate when they decompose
then we have hydrogen gas and oxygen gas
we turn in a natural state that
therefore the oxidation number is zero
so the oxidation does change same for
what we call mercury oxide so here we
have a positive two oxidation state for
mercury minus two for oxygen they
separate we end up with liquid mercury
and oxygen gas some interesting
oxidation reduction reactions that are
also decomposition reactions are those
that involve natural glycerin and try
not true toluene also known as TNT or
dynamite this is what made Nobel very
rich because he's the one that got the
patent on actually using try not to
Halloween by infusing it into an inert
substance and then use it as dynamite
sticks so he made a lot of money after
that but anyway here you can see the
chemical formula for nitroglycerin and
the chemical formula for TNT notice they
both have a lot of oxygen in them the
oxygen axis as a as an oxidizer and
therefore is able to separate these
molecules this is the structure of
neither group glycerine here's a
structure of tri nacho Halloween notice
how this starts with a benzene ring has
3 no.2 attached to it and one ch3 but
then when they react and they start
decomposing into its separate elements
notice that two moles of TNT produces 3
1015 moles of gas notice water becomes
vapor under the intense heat from the
reaction carbon monoxide and also
nitrogen gas so you can see that those
gases those these molecules are
decomposed into what we would call 15
moles of gas gas on there
he didn't expand enough where the
explosive power comes from same with
what we call natural glycerine we have
four moles of nitroglycerin notice they
decompose into six moles of nitrogen gas
12 moles of carbon dioxide gas and only
in one mole of oxygen gas yeah that's
probably correct and then we have here
h2o but because the heat that also turns
into the gas when we add it up we have 6
18 1929 moles of gas in from 4 moles of
nitroglycerin and again the heat
generated in reaction turns everything
into a gas and then again they expand a
tremendous tremendous amount and give it
that explosive power so these are very
interesting examples of decomposition
reactions