Classifying Types of Chemical Reactions Practice Problems Video Lecture - Class 10

here we're gonna practice classifying
chemical reactions we're gonna look at a
whole bunch of them and we're gonna
figure out what type they are now if
this stuff here looks unfamiliar to you
and you need some background check out
my introductory video on this topic and
then come back and we'll do these
problems so here the five major types of
chemical reactions for each I've written
a sort of general generic example
equation that shows what the reaction
looks like now just a heads up the
equations and we'll be using in this
lesson are unbalanced because for right
now I just want you to focus on the
elements and how they're rearranging and
I don't want you to worry about getting
distracted by the coefficients okay so
let's start classifying reactions here's
our first magnesium and aluminum
chloride give us aluminum and magnesium
chloride so what's happening here we
have aluminum and chloride paired up
here magnesium is on its own and then
magnesium comes and takes the place of
aluminum magnesium pairs up with
chloride and kicks aluminum out so when
something like this happens we're
talking about a single replacement also
known as a single displacement reaction
c8h18 which is the chemical formula for
octane and oxygen gives us water h2o and
co2 so whenever we have something with
carbon and hydrogen and we add oxygen to
it and we get water and carbon dioxide
that is a combustion reaction so this
shows us the combustion of octane which
is one of the components of gasoline
magnesium chloride turns to magnesium
and chlorine gas what's happening here
is a compound is breaking down into
simpler components this is a great
example of a decomposition reaction
magnesium and oxygen combine to give
magnesium oxide so what we have here is
we have two simple things coming
together to make something more complex
which is what happens in a synthesis
reaction so this is a synthesis of
magnesium oxide now just real quick I'm
referring to this chart to help classify
the reactions but chances are you
wouldn't be allowed to use one like this
on a quiz or a test ok so just make sure
that you really
these sample equations for each reaction
so that you're totally good with this
when you run into it on an exam or
something silver nitrate plus sodium
chloride give us silver chloride and
sodium nitrate what's going on here well
we have two pairs that then switch their
partners silver was initially paired up
with nitrate and then silver ends up
pairing up with chloride over here and
sodium was initially paired up with
chloride and then sodium ends and
switches up here with nitrate so this
where we have two pairs switching
partners is a really good example of a
double replacement reaction sodium
carbonate turns into sodium oxide and
carbon dioxide so here we have a
compound breaking down into simpler
compounds this is what happens in a
decomposition reaction now in this
decomposition reaction we don't see this
compound breaking all the way down to
the elements that make it up we're not
getting just sodium carbon and oxygen
but it's breaking down into simpler
compounds that themselves are still
combinations of more than one element
but that's okay it's still a
decomposition reaction just as long as
we have something complex breaking into
simpler pieces zinc by itself and HCl
which is called hydrochloric acid give
us sink chloride and hydrogen gas so
what's happening here well look at
what's paired up together hydrogen and
chloride here are pair it up and then
zinc by itself pushes that hydrogen out
of the way and ends up pairing up with
chloride giving us hydrogen by itself so
when this happens when an element on its
own kicks out another element and takes
its place in a pair that is a great
example of a single replacement reaction
sodium chloride and h2 so4 known as
sulfuric acid come together to give us
sodium sulfate and HCl hydrochloric acid
so what's happening here is we have two
pairs of two
different things we got Na and Cl and H
and s o for they switch places
so the NA that used to be paired up with
a CL ends up pairing up with the so4 and
the H that was initially paired up with
the so4 ends up paired up with the CL so
this is an example here of a double
replacement the double replacement
reaction okay here's the last one
c6 h-12 o-6
which is the chemical formula for
glucose it's a sugar and food that you
eat glucose combines with oxygen to give
us carbon dioxide and water alright this
should look pretty familiar when we have
something with carbon hydrogen and
sometimes oxygen and we combine it with
oxygen we get co2 and h2o that is an
example of a combustion reaction and
this is a great combustion reaction to
look at too because this is one of the
examples where what we're burning what
we're combusting doesn't just have
carbon and hydrogen in it but it also
has oxygen remember that it's also
possible to burn or combust things that
have carbon hydrogen and oxygen in them
as well the rest of the combustion
reaction looks pretty much exactly like
it does when you have something with
only carbon and hydrogen so those are a
whole bunch of practice problems for
classifying these chemical reactions if
you can work through these if you learn
these different example equations you
should probably totally fine