Some Basic Concepts - Chemistry - 2 Video Lecture - Class 11

hello friends this video on basic
cursive chemistry part 1 is brought to
you by example comm no more for you from
exam object is of this relation
understand and appreciate role of
chemistry in a different space of life
will explain the characteristics of
three different states of migrant the
classify such turns into elements
compounds and mixtures will understand
the SI basic units and will list some
common principles for that we'll use
scientific notations and perform simple
mathematical operations will
differentiate Brigida si will find
significant figures will convert some
physical quantity from one system to
another system will explain various laws
of chemical combinations will appreciate
the significance of atomic mass atomic
mass etc will also learn molecular mass
and formula mass will describe terms
that is more and more a mass will
calculate the mass percent of different
elements in the compound but it remind
the empirical formula and molecular
formula of a compound and will perform
some geometric calculations since we
have lot to cover in this lesson will
not go deep into these topics but the
objective here is since most of these we
have already learned in the past classes
the objective of this lesson is just to
brush up our past knowledge that we are
more comfortable in understanding the
next chakras what is came has to be all
know what is chemistry but this
understand once again chemist is nothing
but it's the science of atoms molecules
and their transformation
please note chemistry is nothing but
signs of atoms molecules and their
transformations we talk about atoms we
talk about molecules and we talk about
their mass formation correct you can
also say chemistry is nothing but the
branch of science that studies
composition properties and interaction
of matters
there are various definitions in
chemistry so these two definition I feel
defines the maximum chemistry right so
it talks about chemistry is nothing but
signs of atoms
and transformation Hey this talks about
the chemistry is nothing but science
that study the composition of a material
properties of matter and interaction of
man was correct
so having understood the definition of
chemistry let's understand why should we
study chemistry we have done this in the
class 10
but let's again do this if you see the
diamond that's a carbon this element and
these the study of diamonds now comes to
the chemistry if you see the coal you
want to understand the property of corn
how it burns how much heat it will give
for the X amount of coal those things
you can find using chemistry if you see
the plastic materials we should use an
ax like example this water-jar the
plastic CD player CD compact there's
bottles cleaners all these things
involved lasting and the formation of
plastic needs knowledge of chemistry
because it is the chemistry which has
given this plastic to us it's a not
another natural thing is synthetic thing
that is synthesized in the labs and to
do all these things or to generate these
plastics the knowledge of chemistry is a
must the source we use is all the
chemistry which gives the source this
liquid source also it's a gift of
chemistry the detergent which you use
the study of literature everything comes
in the chemistry the fibers the fabrics
which we used that also is has a
chemical property and we studied the
chemical properties of these fabrics and
those the study of these also comes the
chemistry the plastic toys we use
against the plastic so it's chemistry
the notebook we use that's part of
chemistry because we in it and try to
form the composition of the notebook the
pencils has the world and the graphite
everything comes from the chemistry it
is this also you make using the
knowledge of chemistry now a the tea we
have in this the sugar here also we
talked about chemistry the burning of
any such chance the chemical reaction
called
oxidation the wines the beers if you
think the manufacture of those things
involved knowledge of chemistry the
petrol and the diesel be she
in the car that involves knowledge of
chemistry because that example with
chemists know you can see that this
particular fuel will give this much
energy when you burn this much carbon my
cement burns those kind of stuffs we
learnt in chemistry the LPG which we use
in our home for gas that also needs a
good knowledge of chemistry the
fertilizers we manufacture different
kind of fertilizers some RS big some are
basic that depends on the kind of soil
you have right so those things also
comes under chemistry pesticides we use
also comes under okay the medicines we
use when we fall and we get cold or
enough issues in our body we use
medicines and those also comes as part
of chemistry so with this it is pretty
clear that chemistry has a huge
application on you in our day to day
life because we talk about the fuse we
use the toys we use the pencils for you
the dress we wear the plastics we use
the medicines the soap detergent most of
the things chemistry is involved and
that's very that the reason why
chemistry plays a critical role in our
day-to-day life now the question is can
we count the number of atoms and
molecules in any matter you already know
whatever atoms what are molecules right
you must have learned the definitions of
atoms in money in the previous classes
the cushion that comes from - can be can
be count the number of molecules or ions
in a given mass of matter for example
let's suppose I have 110 grams of
suppose anything the grams of gold right
so in the 10 grams of gold how many
atoms are there can be count so these
kind of questions they misty will help
us answer can we see the atoms and
molecules maybe even another question
because you know atoms we know molecules
right so we can go definitions of and
someone close below in fact we also know
how to divide atoms into protons
neutrons and electrons the questions can
reach the atoms those kinds of answers
will try to cover with this lesson
advantage of studying chemistry we have
told that chemistry plays a critical
role in our life we see that the news
plastics diesels patrols of things
chemistry is involved right so what is
the advantage of studying chemistry so
if you see that good the with better
understanding of chemical principles of
any object right it is possible to
design or synthesize new material for
example if you see if you want to create
something which has high magnetic power
or high electric properties or low
optical property any kind of thing will
be required for engineering purpose so
if we have better understanding in the
chemical from we can create such kind of
stuffs correctly also of example earlier
we used to use CFC chlorofluorocarbons
for the switch and refrigerators right
and that was not environmentally safe
those were all hazardous things like so
this was responsible for the ozone
depletion so for this the safer
alternatives has been synthesized and
how it was done because we had knowledge
of chemistry we know the properties of
these CFC and then the chemist and on
the world and they they created a better
alternative to CFC which which has all
the things we need for refresh but which
doesn't lead to ozone depletion
so because we had a problem we knew that
there is something we should require the
frizz but also cause ozone depletion
now since we had the knowledge of
chemistry we know the chemical property
of the stands we are able to synthesize
and that's if you see one achievement of
chemistry right so this is a real life
problem we have that we are using CFC in
the fridge in the that's a depleting our
ocean or a layer that that's pretty bad
so for that the chemist came to a
solution and become solution so the
chemistry since most of the things
around us this is a matter which has
chemical and physical properties so if
you have a better nothing of chemistry
so we can solve real-life problems one
of the example I gave is this that CFC
was causing ozone depletion but again
this was critical because that was used
in trays and refrigerators then you know
we that we use
belike so forth at the chemist found a
safer alternatives using the logical
stream still we have some problems with
the chemistry I mean not the question
but we have still had challenges which
we can tackle with a bit knowledge of
chemistry for example the greenhouse
gases like methane carbon dioxide we
know that these properties cause Pinos
effects we are still looking for a
better solution for this so that we can
minimize the greenhouse effect
right also the biochemical process the
use of enzymes to large-scale production
these things are still in the nascent
stage chemists around the world are
still exploring on these and maybe we
can find a better solution
so because we know that in giant plate
roll you put in giant and the chemical
reaction doubles or triples right so we
want to know why it works how it falls
those things are still pretty much
unexplored rate right now
these are again the challenges of the
chemists now and they're working on this
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