In this video you are going to learn two
tricks that have helped my students pass
Chemistry. Alright let's do this!
[Music Playing]
Hello Hello Melissa Maribel here and I help students like you
understand what you
just learned in class, so you stress less
and you graduate faster. So if you're new
here consider subscribing. How do you
convert units you say using conversion
factors of course. A conversion factor is
a number that has two different units
that allows you to go from one unit to
the next and of course the metric system
is used as a conversion factor alright
I have a trick for you that helps you
remember the metric system specifically
using a mnemonic device the device is
kittens have dreams drinking cold milk
Meow
looking here we see the most common
units used I also want to make a note
that 10 to the 0 power is just our base
we'll get into that later in the video
10 to the 0 just means that it's 1
anything raised to the 0 power is 1 how
to remember this notice, how everything
every exponent is going down by one so
all you have to do is subtract by one
starting with our kilo so 3 minus 1
gives us two. Two minus 1 gives us our deca
and so on and so forth this is how you
remember the typical units used for the
metric system for a more extended
version of the metric system notice that
we can go ahead and just add by 3
leaving off at that kilo that 10 to the
3rd by adding 3 it goes up every single
time and that's how you can go ahead and
remember the extended version now for
milli we instead add a negative 3 so the
top one you add a positive 3 and the
bottom half you add a negative 3 to
avoid any sort of guessing or the
confusion of multiplying or dividing by
a thousand. Help me please what do I do?
Here's a trick for you you want to go
ahead and place the 10 to some sort of
exponent with the base unit, the base
unit is our grams our meters or our
liters notice that this is really just
the one with one letter next you want to
go ahead and place
the one with the different unit by
different unit I mean kilograms
centimeters and milliliters the other
difference factor that we can go ahead
and see is that the base unit only has
one letter the different unit has two
letters for example the ten to the third
goes with our base unit which is our
grams and the one goes with the
different unit which in this case is
kilograms same thing goes with the ten
to the negative second our other base
unit is meters and the one goes with our
different unit which is centimeters
let's go ahead and practice a few
problems together
how many microliters are in 1.5 liters
our game plan here is going from liters
to micro liters our base unit is the
liters and our different unit is the
microliters so our base unit will have
that 10 to some sort of power and the
micro will have the one our proper set
up for conversions is, we want to go
ahead and put the same unit across from
each other, the reason is because we will
cancel out the unit next you want to go
ahead and put your different unit or
your desired unit on top because that is
what you are looking for in this case
are given is 1.5 liters so we want to go
ahead and start with that next our same
unit then goes across from each other so
our liters with our liters these then
would cancel and like I mentioned before
our base unit is liters so we'll place
that 10 to the some sort of power in
this case it's negative 6 and our
different unit is microliters placing
the one there. Next you multiply straight
across and divide by 10 to the negative
6 which gives you 1.5 times 10 to the 6
micro liters it's time to throw in two
conversion factors. How many centimeters
are in 7.6 nanometers? Our plan is going
from nanometers then to meters then to
centimeters
You cannot just connect nanometers to
centimeters you need some sort of bridge
which is meters to connect both units
together our set up will then look
something like this where we have our
same unit which is in this case our nano
meters across from each other so they
can cancel
next we'll get two meters those two
units will then be across from each
other so they can cancel and our last
unit on top is what we're looking for
which is centimeters so our setup will
look like this we're going to go ahead
and start with our given which is seven
point six nano meters we want to go
ahead and place the nano meters across
from each other
notice that we will have that one going
with our different unit which in this
case is nano meters next we're going to
go to our meters which is our base unit
and we'll have that 10 to the negative 9
on top next part will be that our nano
meters will cancel and our meters will
also cancel because we want to go ahead
and place them across from each other so
our meters still being our base unit 10
to the negative second will be there our
meters would cancel and we are left with
centimeters we want to then go ahead and
multiply straight across and divide by
10 to the negative 2nd our final answer
is seven point six times 10 to the
negative seventh centimeters. Go ahead
and try these problems to really lock in
what you just learned.
[Music Playing]
How'd you do? Do you feel like you need some more
practice if so check the description box
below there's a link with practice
problems and step-by-step answers make
sure you like this video if you learned
something and subscribe if you want to
see more videos just like this one
remember I am here to help you pass
chemistry so leave a comment below
letting me know what you need help with
and I'll see you next time.
[Meowing]
[Meowing]
How do you convert units you say? How do you convert units you say? How do you convert units you say?
[Meowing]
Laughs
