Colloids; Solution & suspension introduction - Is Matter Pure, Force & Laws of Motion, Science, Class 9 Video Lecture

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around us part three is brought to you
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drill now we have seen matter can be
classified into pure substance and
mixture also we have seen that mixture
can be further classified into
homogeneous and heterogeneous let's do a
further classification
so if you see matter is classified into
pure substance and mixture mixtures for
the class appearing to homogeneous and
heterogeneous and further classified
homogeneous mixture into solutions
colloidal and heterogeneous into
suspension in fact there's a doubt
actually some people say is that
colloidal is part of heterogeneous some
people say equal ideal as part of
homogeneous but I believe it is more it
more looks like a homogeneous solution
to me we will discuss this part this is
a little debatable topic but as a whole
how much means in heterogeneous mixture
can be further classified into three
other broad categories solution
colloidal particles and suspicions if
you see actually we talk about this
later just understand that remember this
term solution collide aligned suspension
and in all these the key factor which is
different is the size particle size so
here in solution the particle size is
very less less than one the diameter is
less than one nanometer the colloidal
sizes particles are written 1 1 to 1000
nanometer and the suspension the
particle size all the more more okay
example of solution will be you mix salt
and water if you want the example of
colloidal the best example is milk milk
in cotton or the milk itself is a
colloidal solution but if you want to
can dilute it you to bed and if you want
the example of suspension a good example
is mud and water and we will see that
because the particle size they have
different
property okay so we'll further classify
now I just understand that you know I
mean if you don't understand I just try
to remember these three terms solution
colliding and suspension and understand
that these the classification exactly
based on the particle size the particle
size is a middle part when I say
particle in this since example in the
salt and water solution talking about
the solid particle if you talk about the
milk and water and on but the milk
particle to know about the mud and order
mixture and talking about a mud particle
so depending on the size of salt
particle milk particle and mud
practically for the classify these
homogeneous and heterogeneous mixtures
into solutions collide land suspension
okay so when you take one more activity
to first try to prepare this solution
and see how they are different so what
we will do is we will first take some
may be chalk powder or we can take some
mud or we floor or some soil and mix
them in what take one glass of water and
mix it you will get something like this
in this case you will see most of the
particles if you have taken chalk powder
or soil or the wheat floor is settled
down and some of these particles will be
in the solution so looking at this you
can say it is a heterogeneous why
because if you take a sample from here
and sample from here the composition
will take so it is into the vase mixture
but in heterogeneous what kind of don't
make sure it is it is suspension it is
colloidal we don't know
this is holed up in next case let me
write here this is one plus one now in
this this case actually if you use a
filter paper
here if use a filter vapor then what you
will see here is if you filter this you
will see that the mud particles is
collected here and the water particle
will come in so you correct the water
and you see your white particles could
not pass through a filter because the
mud particle size particle size is big
since the particle size is big it could
not pass through a filter paper and thus
you will see that his mud particles or
if you have taken wheat flour or chopped
order those thing will be collected here
in the water will be filtered in the
next case what you take is you take some
milk and mix with water you need
something like this - is you try to
filter you will see that nothing is
collected because everything will pass
the filter the filter will not be able
to block the mill particles so we can
say that here article size is small
correct in the third case what you can
do is you can take some copper sulphate
or common salt if you have NSEL next
second is here called
NSE or sugar also you can take and mix
with water so you get something like
this here also you try to factor it with
silt repper
you see that nothing is remaining
everything is filtered that means here
also the particle sizes particle sizes
is it since the particle size on all the
particles could actually pass through
the filter paper the particle size is
big it will begin to get blocked the
filter vo just imagine so this is like
either the filter paper and if the
particle size is big this will pay you
you think it will pass through this
filter ever know if the particle size is
this way you think it will possible
driver yes same thing so the particles
is this big it will not be able to pass
the filtrate but so in this case yes
either in two case the particles is
small one case the particle size is big
okay and these two looks homogeneous how
much means and this is also mobile use
okay now and this is heterogeneous so
now we have seen that we have told that
suspension is heterogeneous so from this
you can directly see a suspension this
is suspension why because network means
there's only one for the sub
transmission there is suspension out of
these one is colloidal and one is
solution we could tell what which one
and you see both in both case the filter
paper test is failed they both the
solution it passed the filter paper so
we will differentiate what should we do
know out of this I am Telling You one is
solution one is colloidal so what we can
do is now we can try using the laser
beam so we try to use a laser light
actually you will see that in these two
like this one is little doubt this in
this case the whole light will be
dispersed you'll be the whole light
emitted so I will not show that indirect
in case the whole light will be
dispersed in here you know that so
literally smoke us on these two this
anyway something we know then so we'll
chalk on this part so we'll pass the
laser light in these two you will see
that in solution D
where we had milk plus water right or
you can take in plus water you will see
a ray of light here a beam of light here
sorry
it's a beam of light but in this case
where you have a common salt in water or
sugar and water you not see any way of
life so with this you can say that is
colander and we'll talk it tell you why
so this is a 10/2 Leavitt I will talk
about this thing in detail so actually
in this case the particles are not small
acting's are very small okay and these
are small so this has maximum sized
particle this has minimum size and this
is somewhere so the size is somewhere
between these particles actually
reflects the light and since it reflects
the light you see a Tyndall effect but
in this case the particles are very very
small since the particles are very small
they cannot affect the life see for a
light to reflect light should hit the
particular surface and come back right
the particles would be little bigger so
these are the in this case the particles
so small that light cannot actually pick
it turn on it it cannot reflect the
light so you don't see this effect this
content will affect we will see anyway
will understand this Tyndall effect in
detail so with this now you can see that
we have three different kind of mixture
right we could we have produce coal idle
mixture we have to do suspension mixture
and we have produced solution mixture as
well okay so the milk and water was
collided the common salt and water was a
solution and mud and water was
suspension right so this if you do in
your home in pause this video and you
can actually try out this experiment in
the home and then you will get feel of
these kind of
a mixtures are this kind of homogeneous
and heterogeneous mixtures and you can
continue this chapter thank you
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