Hi! This is Dr. Nauli.
In this video and in the next series of videos, I'm going to be discussing concepts
of chemical stoichiometry.
So what I want to do in this particular videos is to give you an overall, broad
introduction to what stoichiometry is, why we need it
and
what concepts you need to master, in order to be able to do stoichiometry problems.
so the word stoichiometry itself means the study self quantities of reactants
and products in a chemical reaction
the idea is the following if you mix the if you mix this to reactance that read
one in the cream one for example
in and get a chemical reaction to happen
and at the end
you have to figure out how much of the
rep reaffirms flip over apparently the green one is you step in this case and
we can also figure out how much of these products are being formed
and that's really
the calculations that will be doing in chemicals they cam three
so what is kept us take young trees so important
well there are two main
goals of for people who study state geometry
one is is very important because it allows us to relate
microscopic
quantities
things like adam's islands and molecules
to microscopic quantities things that we can measure
in terms of units of grams
leaders and other units of masses and volumes
the other thing that's very important it's also a sticky on three pass very
much a practical application in chemistry
sung this white i wondered if you of bit of a feel for why it's important to
study sleek almond tree
if you're of researcher in abiola g_ for example or a neural
science in this case
you can maybe one of the things you be studying is this dopamine
mall kill which is uh... in europe transmitter that means that it's a
molecule that is being released from
one-year onto another neuron
and they're releasing that molecule it
it allows
this particular near on this nerve cell
to arm
producer and physiological responses
let's say you studied his responses in your standard for particular response to
happen
that dopamine
uh... there sir number of dopamine molecules that need to be released into
the second
nerve cells
if you want to put that into practice in practical applications for example if
your doctor and you have to inject dopamine to a patient
you're not going to be working in terms of number of particles or adams or
molecules but you have to have
masses or
usually volumes in this ranch that you're going to use to inject to a
patient
uh...
stoichiometry allows us to translate that information
atomic level information
to the measured quantity grams or milliliters type of information
notice on the side dopamine is a very important mall killian neuroscience
actually because it effects
uh... a lot of difference uh...
physiological responses for example
its role his important for example in learning
in movement voluntary movement
in motivation
in understanding punishment and understanding report
so it's clearly a very important molecule that a lot of people are
studying
and state geometry allows you to translate that information that you
study in the molecular level to something that doctors or other uh...
uh... people who will play
re-use this research into medicine can use
the second part of such entity that touching the previous like is this idea
that
it's very practical
the questions you can ask when she understands that killed three are listed
year here's some of the questions they're really really useful for example
if you mix to reactance together you get a reaction going how much product regan
and yet
or if you want a certain amount of product let's say twenty grams how much
of each reacted are you gonna need to put into the flask
if you have to react and so you get a certain amount of product
what's your yield
how much do you actually get in terms of percentage
uh... do you have any side reactions or others for mental issues with your
reaction you can figure this out bike after reading that per cent of component
you have access reactance if so how much can you recycle it and so on so i want
to leave you here with the slight that tells you what's coming up
basically uh... imported to be able to work through all this lee county
problems
you're going to need to understand all of these different concepts and i'm
going to deliver them and each of them in a field so you need to understand the
concept of comic mass michael amass an average mass
what are some old
and then
how we calculate molar masses in what is up about us number
then you need to understand the concept percent composition which is couple with
the idea of chemical formula determination and then off we need to
know how to write a chemical equation the concepts of limiting reactant in
yield and we're gonna put all of these together in a couple of examples and
then allot of examples that will do in class