Also - why do some ice cubes come out whole and some break into chunks and crumble out?
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The first question has been asked and answered so many times, it should be permanently barred. Go learn some elementary physics.\n\nAs for the second question, it depends on how you take the cubes out. If you twist the tray, which a lot of people do, you will crack the crystalline structure of the ice, because somne of the ice adheres to the tray walls. If you run warm water over the borrom of the tray, they will all come out whole - but not as cold, because the water will have added calories to their edges of the cubes, melting them a little.
513997
If you are talking about regular soda-lime glass, the reason why it is brittle is because its molecular structure resembles that of a liquid.  HOWEVER, it does not have a liquid structure.  Glass is composed of tetrahedral crystals.  That these crystals did not achieve regular, repeating crystalline structure does not mean glass is a permanent liquid.  My Glass Ceramics prof nearly shot me for saying that in class one day.\n\nBut that's exactly it:  Glass is brittle because it does not have good large-area orderly crystalline structure.  If it did, it would be like sheetmetal steel, where it dents and deforms instead of shattering.\n\nI would like to point out something else though:  The strongest fiber ever tested was a glass fiber drawn and tested in an inert atmosphere.  Also, you can take a glass fiber by the ends and bend it into a circle, much like any metal wire.  Hence it is elastic.  BUT if you touch that same fiber in several places, then try to bend it again it will shatter in your hands.
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Take a glass full of water. Put an ice cube on the surface. It will float on it.  Wipe out the spilled water. \n\nAfter certain time when the ice cube is completely melted, you can observe that not even a single drop of water spilled out and the water surface is still up to the brim.\n\nThis shows that the volume water displaced by the ice cube when it floated is equal to the volume water when it is completely melted.\n\nSince it was floating, the weight of ice cube is also equal to the weight of the diplaced volume of liquid.\n\nThis again shows that the density  of ice is lesser than water.
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It is due to the hydrogens bonding to the oxygens. Water always easily breaks up into H+ and OH-, and therefore attracts polar molecules. Also, keep in mind things dissolved into water are either polar or nonpolar, so it based on what is being dissovled into water, it can either become ionized  (break into particles that are charged) or not.
179547
water (H2O) arranges itself into a crystalline structure when frozen (a hexagon) (why snowflakes have six points) the two hydrogen and one oxygen atom forming a triangle.\nthis structure occupies more space than when randomly flowing in liquid state
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The corect answer is 1) - Its molecules speed up.\nmany times the temperature also rises but not always.\nThink of when you heat ice up. At some point the ice turns to water but does not heat up until all the ice is converted.\n\nI hope you are doing your own homework, not using yahoo as a crutch.
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1. Dust flakes float in the stratosphere.\n2. Water clings to the dust flakes as they pass through a cloud, and then fall because of the weight. This is how rain is formed.\n3. If the temperature gets below the freezing point, the water around the dust will freeze.\n4. A lot of these tiny ice drops start to stick together before they're completely frozen, and that is how snowflakes are made.\n\nI don't know how each snowflake has its own unique design, though.
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Most asteroids are made of rock and metal, not ice.  Comets, on the other hand usually do contain “dirty ice.”\nIndeed comets are being “freeze dried” in space, but it is when they approach the sun that the ice begins to melt forming the coma and tail of the comet.\nThe reason that comets do not completely “freeze dry” in space is due to their size.  Freeze drying only occurs on the outside of the comet, not on the inside.\nSee the site below for more details:
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The ice once melts turns into water thus causing the water level to rise but due to the displacement of the ice cube itself the water level will fall as the ice melts. In all the level shouldnt change because your giving and taking almost the same amount of liquid.
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Air has to liquefy before it can freeze. This is true unless you are at the triple point where gases, liquids and solids co-exist. The problem with air is that it is a mixture of gases, mostly nitrogen and oxygen, each with their own triple points.
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The precipitate is a solid, and it usually is in the form of a salt (i.e. NaCl)  If you are given an equation that begins with two liquids, for example, and one of the end products is solid (s), then you know that that is a precipitate.  \n\nPrecipitation can occur for a few different reasons.  One reason can be due to the insolubily of one of the reactants and wil result in precipitation  This can also be due to supersaturation of the mixture that causes the insoluble material to precipitate out of solution.\n\nWikipedia has a nice example using Silver Chloride (AgCl).
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Dew results when water condenses out of the air as a liquid. Dew is liquid water.\n\nWhite frost resutls when water condenses out of the air direstly as ice crystals. White frost is solid water, AKA ice.\n\nBlack frost results from dew freezing. Unlike white frost black frost exists initially as water and then freezes, wheras white frost never exists in liquid form.
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All atoms have intermolecular forces that keep them together as solids or liquids. Adding energy will overcome these forces and cause them to change phase from solid->liquid->gas (with a few that jump straight from solid to gas).\n\nEnergy has to be added to cause this phase change. Going in the opposite direction requires withdrawing energy.\n\nThe types of forces or bonds (not chemical bonds) absorb energy when broken, give up energy when formed. It implies that the solids are in a lower energy state than liquids, and liquids lower than gases.\n\nThis said, when water turns in ice, heat energy is being withdrawn, and the molecules are getting into a more stable and fixed configuration with respect to each other. Because of the polar nature of water, it forms hydrogen bonds between molecules. These type of bonding means when water turns into ice, it positions the molecules into very specific configurations, to maintain the lowest energy state it can get to. Hence the formation of ice crystals.
76927
um. well i would assume itz cuz some of it has a lower density than water and some has a higher density? lower density meanz more holes and stuff in it and higher density means   packed more tightly? hahah. why do you care?
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Not trying to get some help with a chemistry homework problem, are you?\n\n\nOkay, my guess is that the molecules of one of the liquids fit into the "gaps" between the molecules of the other.  Kinda like mixing a quart of pebbles with a quart of bigger rocks.  Since some of the pebbles with fit between the bigger rocks, the combined volume will be noticeably less than two quarts.
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The chemical reaction from adding\nsalt lowers the temperature in which water freezes.\n\nThat is why they throw in onto the roads in areas of winter freezing.
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Water expands when it freezes, possibly making the cube stick up.