But once again recall from our last lesson video that solid ice is actually less dense, not mawr dense than liquid water. Option D here says the latticed structure of ice causes it to beam or dense than liquid water. And so because it says Ionic Bonds here, we should have been able to eliminate answer option C right away. It only has partial charges, so it's not in I am, which means that it cannot form Ionic bonds. But of course, we know that water is not an ion because it does not have full charges. Now, after reading through some of these answer options, there are a few that we can eliminate right off the bed, such as Option C here, which says that the Ionic bonds between the molecules and ice prevent the ice from sinking. So here we have an example Problem that's asking, Why does ice float in liquid water? And we've got these four potential answer options down below. So I'll see you all in our next video Hide transcriptsĪll right. And so this year concludes our lesson on the density of water, comparing liquid water density to solid ice density, and we'll be able to get some practice as we move forward in our course. Create an insulating layer that keeps the liquid water down below in a liquid form, allowing life to survive those ice ages. And that consist, ain life especially imagine? Uh, in the past millions of years ago, our planet went through extreme temperature fluctuations, and there were ice ages that existed, and during the Ice Ages, our oceans would have frozen completely solid if it were not for this amazing ability for water to freeze from top to bottom. And so the ice layer that freezes on top is capable of insulating the liquid water down below. And so once again, this is really important because water will freeze from top to bottom. Whereas if we zoom in specifically to the ice here that's floating on top, notice that it's water molecules are in a lattice structure, and they are much less pack there, much less dense and so solid ice is going to be less dense and because it's less dense, this is what allows it to float on top of the liquid water that's down below, and so it's less dense because it forms stable hydrogen bonds and a lot of structure instead of forming hydrogen bonds that constantly break and reform. And so the liquid water molecules are really highly dense test because they're so highly packed and these liquid water molecules they're constantly forming and breaking H bonds or hydrogen bonds are constantly breaking and reforming. And so what you'll notice is that if we zoom into the liquid water down below, notice that the water molecules are really highly packed into this little small area. And so over here we have an image that shows you both solid ice up here, the top floating on top of the liquid water that is down below. And so if we take a look at our image down below, notice that we're showing you an example of how density of liquid water compares to solid ice. And this is incredibly important for life because it means that water is going to freeze from the top to the bottom, and so when it freezes from top to bottom, it creates a layer of ice on the top, and that layer of ice on the top is capable of insulating the liquid water that is below the surface, and this is incredibly important to sustain life. And so this means that solid ice is going to float in liquid water. This is important because solid ice is actually going to have a much lower density than liquid water, and things that have a lower density in liquids are going to float. And the lattice structure is what allows the water molecules to expand. And this is because they form very stable hydrogen bonds and a lattice structure. And this is because solid water molecules actually expand. And they're constantly forming and breaking hydrogen bonds, whereas solid water molecules and the ice form are much less packed, and that means that they are less dense. And so liquid water molecules are really highly packed together, meaning that they have a high density. In this video, we're going to continue to talk about the properties of water, specifically its density and comparing the density of liquid water to solid ice.
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