Unit Conversion & The Metric System | How to Pass Chemistry
59 Comments


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

59 thoughts on “Unit Conversion & The Metric System | How to Pass Chemistry

  1. Hey Melissa! Can you explain how you got 10-6 for the Liters – first problem. I'm getting stuck on that. Thank you for the help!

  2. Thank you so much. You are really a blessing ! I will be using this video to help me complete my home work and lab assignment tonight. You do a wonderful job of very clear and simple directions. For those of us who are ADHD it can be very overwhelming working equations that have so many steps.

  3. I loved this video so much, so simple and easy to understand… The editing was charming and just about everything was perfect. I was surprised to find you were a new channel, I hope you get to posting more videos… We struggling high schoolers need you!

  4. Hi Maribel, i am new to your page, and love it but i have a question, im older and return to school, im in chem 111, i need more help than others, where did you get 10^-6 from on the liters

  5. I am confused on how to determine the scientific notation to use. for instance, in the problem converting 1738 km to m, I got 1.738. How do you know that it is 1.738 X 10^6 ?

  6. Help Please! Where are you getting these 10 to whatever power, I'm looking on my chart of prefix multipliers and I'm lost as can be, where are you finding them and how are you applying them?

  7. Hi Melissa, I'm confused on when to put it in scientific notation? Like multiplying and dividing, how do I know when to leave it a regular number ? Thank you so much and i can't wait till Sunday:):):)

  8. Hi Melissa, I'm shaky on the more than one step dimensional analysis, like how many centimeters are in a nano-meter. How can I look at it and can tell that it's going to be more than one step? Is there a way I can tell by looking at the table? Thanks Melissa:):)

  9. Can you tell me how to know what conversions to do when you can not go from Liters to Milliliters? For example on the second problem, how did you know you had to use meters to get to nanometers from centimeters? Thats my only problem and that is where I get lost. The video was very helpful by the way.

  10. This removed so much confusion that I had. It’s people like you that make the world a better place. I’m going to pass well because of you. Thank you

  11. This video made me more confused then ever! The beginning was helpful but doing the setup that way? Never would be accepted in my College Chemistry class. UGH

  12. Hi Melissa! I was referred to your videos and wow I am definitely learning now!! My question is, how do I know to go from nm to m to cm? or so on and so forth. I get how to solve the problem. But, how do I know when it's going to be more than one unit? Is there a chart that gives you the order to go from?

  13. 1. King Henry Died By Drinking Chocolate Milk
    2. King Henry Died By Doing Crystal Meth
    ^how I remember the metric system

  14. Thank you so much you're such a good teacher, 😍 because of you I fall inlove to chemistry again. 😘

  15. I’m really good at math but unit conversion really confused me big time. Came across this video and I’ve never been so happy in my whole life. Thank you so much. You explained it so well and gave such an easy way to remember the meter system. New subbie here! 😁

  16. Chem is ez af I’m watching this for physics I didn’t need to know this for my class and my teacher was so trash I never learned this

  17. This added more confusion that clearly any up. An explanation would be better than vague sentences or just saying that it is that way just “because”

  18. Hi Melissa, Im struggling on how you got 1.5l to 1.5mlx10^6 how do you covert that I'm looking at the metric system and I'm so lost

  19. Hello, I am still kinda confused on the unit conversions. Can you go over a problem like this "A pure compound has a density of 6.63 mg/mL. What is it's density in kg/L?
    " It would be extremely helpful if you did this step by step on Sunday if you can. Thank you!

  20. Hi!
    I'm a huge fan of your videos. I sincerely appreciate how much you are able to help kids like me with this platform.
    Something was just a little unclear with me. On 3:37 how did you determine the exponents to liters. I am having some trouble comprehending. Please help
    🙂

  21. This was helpful. This plus a good instructor, plus tutoring, plus helpful class mates = a good grade I hope. Thanks for taking time to put videos together for free

  22. wow you just taught me a whole weeks worth of chemistry, something my teacher is not capable of doing… thank you!! lol

  23. I have been through almost half the semester without knowing how to do these problems and just realized I will never be able to figure it out but after watching this video I actually understand it, thank you so much no professor has ever helped me as much as this did!!!!

  24. we use king Henry didn't usually drink chocolate milk khdudcm (killo,hecto,deka,unit,deci,centi,milli) like if that is what you use

  25. You are so good at making that unit thing much easier!
    Thank you so much!!
    I've been agonizing of how am i going to memorize this units
    Thank you once again!

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