Density Practice Problems
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- Опубліковано 10 лип 2024
- This chemistry video tutorial explains how to solve density problems. It provides all of the formulas and equations you need such as finding the volume of a sphere or the volume of a rectangular prism. It even covers dimensional analysis and unit conversion density problems where you may have to convert g/mL to Kg/m^3. This video contains plenty of examples and practice problems including water displacement method density problems.
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For problem #2, 3950g is correct, however the question was asking for it in kg. The proper dimensional analysis conversion is to take the 3950g, and multiply it by (1g/10^3kg)=3.95kg. If you look at the metric unit factor amount of kilo, you will see that kilo means 10^3. So you grab the initial amount, multiply it by 1g to cancel out the grams in the initial amount, then divide it by kilo 10^3 which amounts to 3.95kg. I hope this helps!
the unit is 1kg/1000g, grams on the bottom to cancel out from 3950g
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same thing i was about to say,thx
yes that what I was saying. It should be in kg not g
Yeahh, if the mass is suppose to be in kg then after getting 3,950g convert to kg and that will be 3.95kg.
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100% the best explanation yet
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ok
In your answer to #2 you give it in grams, however, your question states kilograms
Yes it must convert into kg, right?
@@dexterlaboratory8979 yes. so the right answer to that would be 3.95kg not 3950g.
Yupp
actually the answer is 3,950,000Kg
@@joeblanco1434 I think its 3.95 kg
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Thanks so much for this video. You've shown all kinds of problems, which was really useful.
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Finally I've found a very detailed explanation! Thank you so much Sir! 😊😊😊
Your videos are really well done. Thanks so much.
I am learning with you sir really good your voice is clear and easy to understand thank you so much for this video.
I have learned a lot from watching this thanks.
It's been a long time since I've done these types of problems.
Thank you.
Haven't studied a lick of content for my exam later today, and here I am
Professor Organic Chemistry Tutor, thank you for a solid analysis of Density Practice Problems in AP/General Chemistry. The practice problems/examples really show how to calculate Density using the given formula. Thanks to viewers for finding and correcting the small error in problem number two. The final solution to problem number two should be in terms of Kilograms not Grams.
Math is like that. Multiple steps can make you forget a step. This is the only site I like to use for anything having to do with mathematics.
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Thanks!
Answer for question #2 is correct which is 3,950grams. However, the problem is asking for its mass in kg so you have to convert it for you to get the mass in kg. So, answer will be 3.95kg
Fuel tank holds 22.3 gallons of gasoline. Density of gasoline is 0.8206 g/mL, what is the mass in kg of gasoline in a full tank?
(I can’t seem to figure it out. We are looking for mass, so multiple D and V to get 18.298380 mL and I divided by 1000 mL since 1 kg = 1000 mL, so I got 0.0183 kg as I rounded)
I have a problem I’m stuck on. I’ve watched your videos, but when I try to do it myself, I can’t seem to get the right answer!
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Is it possible to find the height of a cylinder only given the density and radius? I wasn't provided the mass in my problem and I have no idea what to do
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What is the program that you used to do that video?
2:04 For anyone wondering how to convert g to kg, simply divide the answer by 1000 and if you want to convert it back to kg, just multiply 1000. That's why many people says the answer of number two should've been 3.95kg
Thank you
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Valerie Arana Gomez you got this
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The second question states the answer to be given in kg but you did not convert it, it would’ve been 3.95kg. Anyways thanks for all your help, I really love your channel. :)
Thank you😊
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If a piece of rock has a volume of .73 L and a mass of 1524 g what is the density of the rock in g/mL. So its 1524g/.72 L which is 2087.67. So how would I write the answer? Dont I have to do something with the decimal point?
Heidi Wetterstrom This is a little late, but here goes. Since the question asks for density in g/mL, the answer will be 1524g/730mL = 2.1 g/mL. When dividing, you round off the final answer following the least significant figure, which in this case is 2 sig fig (based on 730 mL).
09:11 shouldn't your sig figs be just two? 25g rock is two sig figs so should your answer be 8.1 g/mL instead?
Yeah same for the first question, there’s only 2 sig figs in 50 g and 8.5 mL so the answer should be 5.9 g/mL.
most tutorials don't follow sig figs
and the conclusion is mass is a product of density and volume :)
ok thanks!
Thanks very good explanation!
It will help me in the science exam lol 😆
Howd u get 500 ml i the first problem
In the first question you didn't change from g to kg
isn't it the second question?
@@ruthiemellows8354 yh
if you have a mass of granite 15.6g "suspended" can a mass of 5.5g of water displacement finding the density
I'm confused on how your answer for the first problem is 5.88g/mL? that answer has 3 significant figures yet the most in the problem is 2 and the limiting is 1 significant figure is it not?
Lakoda Hindahl Yes. The answer wasn't presented in the correct sig fig. Otherwise, it would be 6 g/mL.
@@ChemSimplified wouldn’t it be 5.9 g/mL? The 8 rounds the other 8 to a 9.
most tutorials dont do sig figs
I pls need an answer, why is the first example, =5.88 g/ml | the ml why isn’t it cubed???
1 cm^3 = 1 mL , no need to cube mL
What is the density (in g/L) of a gas with a mass of 60 g/mol at 0.75 atm and 27 ⁰C?
Help🥲🥲🥲
I think the final answer in no. 2 is converted into kg?
yea but you can convert it though 1000 g=1kg so to find it in kg just multiply by 1000
@@divyoroy9056 but hes saying that the video creator got the answer wrong because of that
this help me alot thank you!!!!!!!!!!!!!!!!!!!
For #3, isn't the answer actually .00926kg/m^3 because 1000g = 1kg? Thanks!
When I solved 4/3π(2.5)³ it equals to 65.44 ?
Isn't it necessary to come up with the answers in its significant figures?
i want to ask a question can you solve it sir
awesome vid helped me with my exam.
Stress has it aim at signaled false density
Is it 3.95kg per 500 mL for question #2?
2:01 The question asks for the mass in Kg, so the answer is actually 3,95 Kg
no comma needed, just 395 kg!
@@boaaintnowayboa3002 3.95 not 395
In question #2, the answer must be given in grams, doing some unit conversion, 3950g/1000g gives you 3.95 Kg
Hear, Density = Mass/Volume and Mass = Density*Volume here we don't know the density? please tell.
I want to say the density of water is around 900 to 990, the rock in question #4 is 8.06g/ml , that should float in water, so how it sank
Another more pls i iam 4thgrade need more dont wanna fail in science!
You won't be doing this science for a while hopefully lol
I don't know how you got here but don't worry, this is chemistry. You won't need to know this yet. Just keep practicing your multiplacation times tables because you will need them for perimeter and area, harder fractions and even harder math problems. 4th grade is important so try your best because ( if you're in New York like I am) you will have to do the science state test and if you're not then 4th grade is getting harder since it is preparing you for middle school.
Btw my little brother is in 4th grade too, so I know what I'm talking about
1:58 your supposed to put it in kg
i was forced to come here
lol
I came here from a link my teacher gave me in edmodo lol
🤣
what is the full answer about that topic because i cant understand your calculatio n:>
The answer in kg / m'3 is 4.3196×10™-4
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video is very helpful but can you please explain too
Please simplify it to the least significant figures
Done
On the second question you forgot to change the mass in kilogram its okay tho we are all humans after all but the real answer is 3.95Kg. thanks for the video it helped a lot i swear! Blessed.
yeah
That's cool
in question #2...3.95kg? or still 3950g?
No sig figs?
problem 2 you forgot to covert the unit from g to kg xD but still, nice explanation
Ive been given a density question, and the question reads, "A small sphere of unknow density is dubmerged in a beaker of water and let go. Immediately after being let go the sphere accelerates down at 1.70 m/s2. What is the density of the sphere? (d(water)= 1000kgm-3, g=9.81ms-2)
Like WHAT, any help LOL
If you have the answer can you tell it to me?
@@adminspiderman5378 this was first semester cuz, long gone past this paper
covert it to Kg @1:59
All is great but I am utterly lost on the one where you use Pi 😭
Same
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2:01 the answer to problem 2 has to be given in the kilogram unit; therefore, the answer should be 3.95kg, shouldn't it?
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The answer in question 2 was in gram when we should have put it in kilogram
Water in a beaker measures 250 mL. A rock is completely submerged in the water. The water level now reads 350 mL. What is the volume of the rock in cubic centimeters?
10 cm^3
In question number 2, isn't it you need to convert g into kg.
👏👏
Why didn't you use significant figures?
it can be solve in gram? why you not change gram to kg first? this is confusing me bcoz my lecturer said that must change the SI unit first? please explain. huhu.