In this video you are going to learn

everything that you need to know to finally conquer conversions. 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. Dimensional analysis,

conversion factors, conversions, unit conversions, [Sigh] All that means is going from

one unit to the next. These are the most common conversion factors that are

specific to length, mass, volume and time. In the description box below you’ll find

a link that allows you to actually access the same conversion factors. Let’s

go ahead and jump into our first example the mass of a frisbee is 125 grams

convert its mass to ounces using the conversion factor one ounce

equals twenty eight point three four nine grams you’re given is the 125 grams

this one is so nice to actually give you the conversion factor of one ounce is

equal to this amount of grams and we are finding our ounces.The plan is to go from

grams to ounces the proper setup is having your given on top diagonally we’ll

place the grams across from each other so our units will cancel. Grams would

then cancel and we’d be left with our ounces. You just divide these two

numbers. You end up getting four point four zero nine ounces however our given

was three sig figs we need to round up Your final answer is that four point four

one ounces. Moving on to example two using two conversion factors.

How many minutes will it take to drive to LA from San Francisco if a speed of

72 miles per hour is maintained the distance between the two cities is 405

miles first start with identifying

you’re given conversion factor or factors and what you are finding you’re

given is the 405 miles our conversion factors. We’ll start with the 72 miles

per hour so per hour just meaning that it is for

every one hour from there we need to convert to minutes so we’ll need the

conversion factor of 1 hour equaling 60 minutes because we are then finding

minutes. Your plan is starting with you’re given the miles we’ll convert

that to hours using the first conversion factor then from there taking our hours

and going to minutes using our second conversion factor. The set up is starting

with your given we’ll have our miles on top we want to match those miles on the

bottom so they can cancel. Note that these miles will then cancel and we’ll

have hours now on top you want to cancel out our hours we’ll put them across from

each other now they cancel as well and we’re left

with minutes multiply straight across and divide by that 72. You get three

hundred and thirty seven point five minutes however we have three

significant figures so we round up your final answer is three hundred and

thirty-eight minutes. Let’s look at our last example. A patient needs 50

milligrams of a medicine three times a day. If each tablet of medicine contains

25 milligrams, how many tablets will the patient need for a four-day prescription?

As always you want to go ahead and start with identifying your given, conversion

factor or factors and what you are looking for. The given is that 50

milligrams three times everyday conversions factor is that one tablet is

equal to 25 milligrams where we saw that that said each tablet of medicine

contains 25 milligrams and lastly you are finding the total amount of tablets

in that four-day prescription Step one is to multiply your given by

three take the 50 milligrams and multiply it by the three times per day and our

actual given is 150 milligrams per day The next plan is taking our milligrams

per day and changing that to tablets. The proper setup will have our new given the

150 milligrams per every one day. Next you want to match the milligrams to

cancel them out, we’ll place them across from each other using our conversion

factor. The milligrams will then cancel and now we have tablets per day

divide the 150 divided by 25 and you get six tablets per every one day. We

got that here with our tablet per every day. The last step is then to multiply

by four using the six tablets per every day we’ll cancel out our days putting

them across from one another six times four then gives us 24 tablets.

Grab a pen and paper and try these practice problems [Music Playing] How was that? For conversions I do

recommend practicing as many problems as possible! In the description box below

there’s a link with practice problems and step-by-step answers. Make sure to

check that out if you really want to ace your exam. Make sure you like this

video if you learned something and subscribe if you want to see more videos

just like this one and remember I am here to show you how to pass Chemistry!

So leave a comment below letting me know what you need help with and I’ll

see you next time. Grab a pen and paper Grab a pen and paper and write these practice problems [Laughs] down. [Laughs] Okay. Grab a pen and paper and try these practice problems [Laughs] Grab a pen and paper and try these practice problems….Straight face

Melissa tutored me in college algebra for a year and with her help I succeeded in achieving my first ever 4.0 GPA she helped make sense of concepts that I had trouble with. When I needed extra help on a concept we spent time going over it until I felt confident with it. With her help I had a very successful year and Melissa is very accommodating. She also always has more than one way to teach the same thing for those who learn in different ways. I would always recommend her to anyone that needs help in math or chemistry.

What do you do if the conversion is not given to you? And you don't have it memorized? My teacher won't give us conversations on any of the tests

This was very helpful! Thanks!

wish you did pre-calc as well! you rock!

where can i download your notes? and hoping you can still upload the practice problems that way i can practice for my exam

You really helped me tonight, thank you!!

For the first example wouldn't it be 340 since 72 only has 2 significant numbers?

OMG!!!!U R AMAZING…BEST..

SHORT VIDEOS BUT MEANING FUL..THIS IS WHAT I LIKE

thank

you so muchhhh

you missed the persons hand in the beginning when you tried to give a high fiveðŸ˜‚

So after you have done the conversion you only round to the significant numbers of the original number? For example in the video you multiplied 60*405, but rounded it up to 3 sigfigs when 60 has the least sigfigs.

Your wonderful and very helpful my new friend:)

I LOVE LOVE LOVE you. you are such an amazing person for taking time out and making these videos to help students

I want to determine V2O5 by titration with kmno4

Here's another updated video to help you with Unit Conversion: https://www.youtube.com/watch?v=7voNNBbMcxE

Can someone explain the first practice problem?

Thank you soooooo very much. I was struggling understanding how to set up the problem and which factor to use and this completely helped me. I really really really really am soooo grateful that you did this video. You made it sooo much easier to understand.

t h a n k y o u s o m u c h

The night before my midterm and you totally saved me.

Love your help! TY Melissa! How did you get 11 tablets? I got 10 ðŸ¤”

thank you SOOO much!!! I'm so close to the chemistry regents, but I don't know anything. Thanks to you, I finally get the hang of it. Wish me luck!!!