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]
How do you convert units you say? How do you convert units you say? How do you convert units you say?
[Meowing]
Laughs