A scientist went for a walk. He found a large piece of white chalk. The Calcium's nice, but to be quite precise, it's really not worth a long talk. I'd rather find bones of a sheep. It's something I dreamt in my sleep. And maybe the pelvis of a young sheep named Elvis. Now that would be rather unique.
For anyone still in doubt. The two burning clips are rounghly at 5:35 and 6:55. They have a different choice of words, different camera behavior and another camera is visible in one, but not the other. Hope that helps. - Kevin :)
I like the part on the water getting to acidic. Reason being is we are losing a lot of Coral Reefs in the world which need CaCO3 in order to make their bodies but due to high of acidic levels in the water they can't make them some times, or they do a bleaching effect. Coral Reefs are like our earths EKG monitor the more color and more reefs the better the earth is. The whiter and less of them the earth is not so good. Keep up the videos, and happy holidays.
I think it would be important to point out that the chalk found in Dover isn't the same that's used to write on blackboards. The Dover chalk is made Calcium Carbonate while the stuff used on blackboards is Calcium Suphate (a close relative of Plaster of Paris) That confused me for a very long time... all that talk of chalk! ;)
@Roshkin It's a practical question of cost effectiveness. N2 is very abundant in the atmosphere so it's relativly cheaper to separate and purify. So if N2 can do the job this is usually the first choice for science and in industry. As the scientist said (Debby), we want to prevent oxidation of Ca in its pure metalic form. A nice dry N2 atmosphere can do the job very well because it displaces Air, which has 8% O2 (if I remember !), and also displaces any moisture.
@Roshkin Cost. You're breathing almost 80% N2 right now, but only 1% argon. Most labs have a large dewar of liquid nitrogen outside the building for scientists to use. Because the second (I think) law of thermodynamics tells us dewar flasks must always be imperfect, a small amount of heat always makes it into the inside of the container and so a small amount of N2 is always boiling off. This extremely pure, dry gas is then used for "house nitrogen" in most labs.
I heard It's been hypothesized that during a fever our body raises it's temperature mainly to heat up the bones and free some calcium from them. And the reason being that leucocytes use some form of calcium to travel around the body, and if the calcium-level of our body is not high enough, the body will need to get more from bones. And from this follows that fevers can be treated many times by taking some extra calcium. Like Calcium-lactate that is easy to turn into Calcium-bicarbonate, which is
@Roshkin the bond between N2 (3 shared electrons) is much stronger than O2 (2 shared electrons). Calcium just isn't reactive enough to break all 3 bonds that N2 has but is reactive enough to break the 2 bonds in O2
@mewrox99 The salts would usually take on the colour of its cations I suppose. If not, iron(ii) salts would be many other colours instead of being green. Correct me if I'm wrong!
Might I suggest you add some more tags to your videos Brady? It might help more people to find these gems! Maybe things that are related to the video or even more general like "science" or "educational"
@periodicvideos And you did a marvelous job at it. To me, it looked like it was taken as two takes and instead of using only one of them, you decided to use both. I am just guessing but; in the video, the first one was shot after the one shown later. It is only a guess though, I think it is that way since she was more certain of the impurities the first part, and not so sure second. Anyway, great job and keep up with good work!
I was confused by this too... I think that the Prof mis-spoke, and meant to say that (rather than temperature) as atmospheric CO2 levels went up, this would increase the amount of CO2 absorbed by the oceans (more available to absorb at the same relative pressure). The Wikipedia article (don't laugh) on this subject seems to be well-sourced with plenty of further reading... look for "Ocean Acidification"... hope that helps.
Most caves that are open to the public in the US that I've been in make a big deal about them being "living systems" where the formations are still growing, and frown on any touching of stalactites and stalagmites. Cave of the Winds above Colorado Springs, for example, actually has metal mesh in place to prevent visitors from getting at the "soda straws". However, as far as I'm aware, this is a fairly recent realisation, and probably, sadly, wouldn't have been a problem forty or fifty years ago.
@trespire So the Ca doesn't react at all with N2 because there aren't enough electrons in the N2? Or is that the slight tarnish on the Ca? I thought it could be trace O2. And if memory serves me, there is 21% O2 in the atmosphere.
The great thing about science is that it's separate from religion and politics. It doesn't matter if you "believe" it doesn't exist or that it's a man made problem. The empirical evidence overwhelmingly points towards the fact that it exists and it's a man made problem.
@DancingHorses26 I think it's the camera's inability to capture the true colour of the flame. Once it gets less intense (near the end of burning), you see the redness
@Radl0activE the rise in temperature does not have a large enough effect to prevent more carbon dioxide from being dissolved into the ocean. Although increased temperature does result in decreased solubility in the case of carbon dioxide, the global temperature only rises a few degrees, which is not enough to dramatically change the solubility.
@Roshkin Nitrogen, because of how common it is (around 70 - 80% of air) is much much cheaper than a nobel gas, the most common of which in the earths atmosphere is Argon (around 1% of air), and is still quite inert at room temperature and pressure, a lot more so than Oxygen for example, so although ideally the atmosphere around calcium would be helium, or neon, nitrogens cheapness and relative affectiveness render it the most suitable.
@oisiaa No it's not listen to what she says before she burns the calcium compound it's different and uncut therefore two different scenes I'm sure the reason she repeated that there may be some sodium in there is because she didn't think both takes would be used just one.
@periodicvideos Sorry about that. I thought she did considering she said the same exact thing twice. I assumed it was either the video or a second take added in as padding. Either way, like I said, you made my day. Your videos are always a bright spot in my life! :)
@Halo3ForumEurope do you know what connects spotlight and lime? i heard that limestone emits light when exposed to high temp. I'd like prof. to tell us something about it
@Radl0activE Carbon dioxide dissolved in water produces an acidic solution. The more carbon dioxide is dissolved, the more acidic it becomes. The oceans happen to store more carbon dioxide than anything else on earth, and will continue to absorb more as it is released into the air. Because carbon dioxide is thought to be the primary greenhouse gas that causes global warming, it would make sense that more global warming = more carbon dioxide = a more acidic ocean
why do the best teachers have the craziest hair? my favorite high school science teacher had crazy hair. i laughed when you said car wheel made of calcium.
A drop in pH means they are more acidic... and the oceans are quite vast, you know? A lot of water in there. For the ENTIRE OCEAN to drop even .1 pH is actually quite substantial. And you'd be surprised just how sensitive life can be to, you know, the acidity of their entire environment. People have good reason to worry. Maybe we should just, I don't know, lower the amount of CO2 we release? Why is this such a difficult thing to understand?
Since our bodies needs to keep our blood at a stable acid/base ratio, base minerals such as calcium are pulled from bones and teeth to normalize the acid/base ration after drinking milk.
dictionary reference com/browse/criticise (Replace spaces with dots) You'll have to quote me a few of those great poems. A saying is hardly subject to any rules, they're sayings, there are no rules for sayings.
So could you make an alloy with calcium in a vacuum and come up with a metal that wouldn't react? I think of most elements as stellar elements by the way.
People are very short term. The common human's mind is so very narrow in scope that that do not have the capacity to understand and be amazed at the wonders of such works.
Not true. It does not de-mineralize your bones. By the time it is in your blood, the pH has changed. Inside your body, you are alkaline, save certain parts of your digestive tract. Even then, your blood is in a closed system, so your organs are not exactly covered in it. Also, almost everything we eat is acidic.
as i recall, after ~30 people cant replenish the calcium in their bone, however a healthy intake of calcium would ensure a healthy amount of calcium in the body so that the body wont have to use the calcium in the bones. hence preserving the amount of calcium in bone.
There once was a young sheep named Elvis. Who rather liked shaking his pelvis. He stood in the meadow, until he was dead-o, and then they collected his pelvis. ;-)
I love this series. Informative, entertaining, and cool. *thumbs up* Would it be sexist if I said that I think that girl chemist is quite the hottie? I do think she has a 'hot' brain as well if that makes it any better. ;)
