Step by Step Density Practice Problems to Help You Pass Chemistry

Learn how to use density as a conversion factor and how to find density. This video explains what the proper units are for density and how to get the correct answer every time! Together we practice all types of density questions step by step to avoid any surprises on your exam.

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Density practice problems with step by step answers:

In-depth "how-to guide" on density:

TIMESTAMPS
0:34 Density
0:51 Density as a Conversion Factor Example
2:45 Dimensional Analysis and Density Example
5:41 Finding Density Example
7:08 Practice problems

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Practice problems in the video:

What is the density in g/cm^3 of an unknown solution containing 2.3kg and 8.0L?
Answer: 0.29 g/cm^3

If ethanol has a density of 0.789g/mL and a mass of 36.4g. Find the volume in mL.
Answer: 46.1 mL

The density of a solution is 0.791g/cm^3. What is the volume in cubic inches of 2.7lb of the solution?
Answer: 95in^3

[gilly]

I have a question. Did you just memorize all the conversions and do you have any tips on memorizations for them?

[kayleystevens]

I have been getting F's all this semester and let me tell yu this was a piece of art. This video helped a lot and I have bumped my grade all the way up to a I got an A++ on the assignment.
Thank you So SO SO SO much!! LOVE your vids keep making them!!

[patricebrown]

This video is a life saver! I watched at least three other videos on density and this video was the one that I was able to understand. I love the way you broke down each problem.

[matthewhart]

Step by step yet so simple. This channel is outstanding had to watch some videos for my chemistry class. This is so simple to understand. Perfect job, now I understand this a lot. Thank you!

[justinecarmine]

Thank you so much for this video. I have to pass Chemistry in a matter of weeks in order to be able to start grad school on time. Praying for a miracle but your channel is definitely helping me. I will be referencing all of your resources!

[kevinhsieh]

Thank you so much! I learned more from you in 1 video than from my teacher in 1 week :)

[bathshebafrancis]

God Bless you Melissa! This is really REALLY helpful!

[yeseniagarcia]

Literally didn't understand my homework and no lie almost dropped my chemistry class because I seriously figured I need to perfect algebra ....I came here and I feel better.

[endingthesilence]

Hey, great video as usual! When you're doing all the conversions you don't round them to sig figs correct? For the last example I keep getting 94.48272009 in^3 and rounding to two sig figs would get me 94, I am assuming I am a few decimal numbers off because of sig figs or when I cubed 2.54cm?

[MerkSteeZe]

Do you have every single conversion factor memorized?

[mariajosesantandermercado]

thank you, this was soo helpful! love your little dances during the problems at the end <3

[prisilareyes]

THANK YOU QUEEN UGH I WAS SO STUCK BUT U JUST HELPED ME😭😭

[yourpaljd]

How did you get 0.008 on the last one?

[adrianarojas]

I am so happy I discovered this channel! Melissa Maribel, you have helped me so much get through assignments a little bit easier. Can you do a video on the relation between molarity and density, or percent yield? Thank you!

[EchoSiera]

You’re saving my life for my exam!!! Thanks for being so kind and helpful ❤️❤️❤️

[jaredsloneterrell]

i love step by step vids thank so much . i been trying look for something like this

[seemaparmar]

I love you. You're literally a life savor - THANK YOU

[abrahamaguilar]

how do you find the conversion factors? how do you know you are to convert lbs to kilograms ?

[milagrosgranados]

Yay! I got all the practice problems correct! The last one was tricky because of all the conversion factors. I was unaware when I come across something like 75g/mL that I can make that into a conversion factor. This is so new to me. I always got stuck when I came across something like that. I also was unaware you can square or cube a whole section in a conversion factor. My professor kept doing this last semester and I just didn't understand. I'm like where did that come from? How can you do that. I was completely lost. He just kept responding oh you will get it sooner or later. Last semester was online so it was very difficult for me. I passed the class with a "C". That wasn't the grade I wanted. I will be retaking Chemistry(I) in person this time. I want to get a better grade and retaking this class will help me better understand Chemistry (II).

I don't understand Melissa every time I do the practice problems at the end of your videos I am getting everything correct and I feel like a rock star but when its with school its seems more difficult and the way the problems are written are confusing. I end up failing or barely passing. Your practice problems are straight forward and easy for me to understand.

[CiTyScApELeAkK]

thank you some much. you helped me understand better and even gave me information i missed during the lecture by the teacher.