What is Density in Chemistry & Why does Ice Float? - [1-1-12]

In this lesson, we will learn about density and volume in chemistry. We will learn that density is the measure of the mass of a substance compared to its volume. We will use the density to measure the properties of a substance. Water when it freezes forms a solid ice, which actually has a density less than that of liquid water. This means that ice floats on water and allows life to exist on earth. We discuss exactly why this occurs in water.

[Nightcrawler]

You are one of the best professor ever existed on the face of the world. I am 65 year old man raising two boys ages 8 and 10 on my own. I love the way you explain these subjects. You teach from the bottom of your heart Mr. Jason. That's my son's name. I love sir. You are unique and may God bless you.

Thank you so much

[mariocesarsousa]

The best utube teacher. I learn easily all the sciences✍️✍️👏👏👏

[felixyongco]

Jason is God given to us to CLEARLY explain what other tutors can not . Thank you Sir..

Wish to see you again ...in other tutorials.

[JanitorMan]

Sir, you’re an incredible teacher. I learn more from each of your individual videos then I did in almost all of high school combined. Thank you.

[naderhumood]

Terrific keep it up, Thanks v much Sir .Great channel.

[superranger_all-rounder]

Sir ! Yesterday i find your channel. Sir the way you explain is incredible. This channel has everything thanks 👍

[fahimkhalasi]

thank you for explaining what density is and how ice floats on water and linked to polar molecules as well

[ricardvaletaibanez]

Thank you, teacher, for the explanations in this lesson about density and the polar molecule of the water 😀👍🏻💧🌊❄🌧

[alhajisaccoh]

Things I missed in my chemistry lectures in university are being reduced to the simplest form for better understanding.

[girmaybass]

Thank you so much for explaining in detail!

[daved]

That was a wonderful lecture; very enjoyable as always. The density of substances was very well explained and re-iterated. I never knew why H2O expanded during its phase change. I enjoyed how you mentioned that, life on this planet would be much different if not for this fact. My understanding is that H2O is the only substance that expands a few deg. before it freezes, i.e. before the phase change. I believe the expansion of water starts at 4 deg C/39 deg F. As far as I know no other substance, known, expands as it cools.

[rezzer]

Should be finished teaching a year-one's worth of chemistry by now. Wow.

[roberthornbeck]

Wow. where were you in 1967 high school :) REtired engr

[briankelly]

Did you mean "because ICE floats"? You said "water floats" at the start. Great video.

[anthonygregg]

amazing presentation. you explain things so well. Thankyou sir.

[davidwatson]

"if you stick with me..." Hahaha. You are doing important (to me) work here bro. Thank you.

[abd_almer]

الخط المستقيم بين الأوكسجين والهيدروجين في الماء منحني وليس مستقيم !
نظام SI - m
الملي متر = سنتيمتر تكعيب
1cm³=1mL
1L=1000mL
كثافة الجسم = كتلته على حجمه
Density = mass\volume
=kg\m³
وقد قاموا بتصغيرها لكي تكون سهلة
=g\cm³
الملي متر نفسه السنتمتير
الكتلة قياس عدد الذرات في الشيء .فإذا ضغطت القطن سيبقى نفس الكتلة . فقط الكثافة تتغير . وإذا قطعت مكعبًا من القطنة الغير مضغوطة سوف تاخذ كتلة اقل لكونها كبيرة ، ولكن إذا قطتها من المضغوطة ستأخذ كتلة اكبر لكونها صغيرة ومجتمعة .
كتلة الماء = 1 g/ml ، وانها قريبة من 0.999 وليست 1 .
ودرجة الماء الحرارية : 4°c
كثافته = 1g/cm³
اذا ذكرت كتلة الشيء اذكر كثافته .
اذا كانت كتلة الشيء أصغر من 1g/ml فإنه يطفو على الماء .
من حسن الحظ ان الجليد يطفو .
اتضح ان الأوكسجين هو أحد أقوى قوى الجذب للالكترونات .
الهيدروجين والاكسجين يتجاذبان فالاكجسين شحنته موجبة وذاك سالبة .
الاوكسجين يقوم بسحب الالكترونات الخاصة بالهيدروجين 1 ، 2 .. قليلًا جدًا ، لذلك عند التكبير ترى ان الهيدروجين عبارة عن شحنة موجبة ، وهذا يسمى جزيء قطبي او الماء القطبي لانه يحتوي على اوكسجين سالب وهيدروجين موجب .
لماذا يطفو الماء او الجليد ؟ لأنه عندما تكون بتبريدها ، القوة الجاذبية بين الهيدروجين والاكسجين المجاور الجزيء يقفلوه في مكانه في حجم اكبر ، وإذا كَبُر الحجم صغُرت الكثافة .

[elahawaziri]

your explain everything so great thinks

[mohergenrader]

I'm picturing H and O in the H2O molecule acting like they are in a mosh pit when it's hot. Is that wrong? 😂

[ramsundarpanda]

Thank you so much for your super explanition!! 😊