If heat rises, then why does ice float?
94309
because it is less dense than the water
749533
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energy state than liquids, and liquids lower than gases.\n\nThis said, when water turns in ice, heat energy is being withdrawn, and the molecules are getting into a more stable and fixed configuration with respect to each other.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.
943048
Whenever the mass of an object is less than the mass of the liquid it displaces, it will float.  That's why a hunk of steel won't float, but a ship made of steel, enclosing lots of unoccupied space, will float.\n\nAs for the ice cream, its made up of lots of fat molecules whipped into a semi-solid.  Its mass is less than the mass of the root beer it displaces...therefore it floats
50088
During the winter, the air is colder, but the ground (at least deep down) stays pretty much the same temperature.  Therefore, in a lake, the cold is coming from the top.  This usually freezes the top layer of the lake, which also shields the lower part from freezing - it is now insulated from the weather.  It is very important that ice floats over water, because this allows the ice to make a separation and enables the fish and wotnot to survive the winter.
988748
heat technically speaking, does not rise. heat energy travels from area of high energy to an area of low energy (think about how heatsinks work). it's just convient to say it rises.\n\nThe reason why it's colder the higher you go is beacuse the pressure is less and the heat energy is more spread out. therefore the tempreture goes down.\n\nboth are covered by two of the three law of thermodynamics, not sure which ones exactly. it's been a while.
89138
If they were tha same density, the ice would float at the surface of the water. As more dense water buoys a body floating in it, the amount below the surface is 920/1030 so the amount above the water is 10.6%
559672
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.
155067
The liquid molecules begin to heat up which causes them to increase their moleculer movement. They eventually move very far apart which causes them to be in the "gas" state.
1154777
When any salt particularly NaCl is added to the ice, it lowers down the temperature. The FREE ENERGY of the ice is interfered by the energy due to the ions (Na+ and Cl-) of the salt added to it. The movement of water molecule is restricted to some extent in the ice in the presence of salts. The energy saved due to restriction of movement of water molecule is being utilised by the ice to remain at still lower termperature aganist the surrounding temperature. Thus addition of salt to ice reduces the ice temperature.
1142972
In short, ice float in water because it is less dense.\n\nDensity = mass / volume\n\nFor a more thorough explanation, one needs to look at what happens when liquid water freezes into solid water (ice).\nAs the water freezes and becomes a solid, it expands.  The volume of a given mass of water becomes larger, therefore the density decreases.  Without going into the effects of buoyancy to explain "why" less dense things float (the weight of the fluid they displace is greater than the weight of the object), just accept that they do.\n\nTo be even more thorough,\nWater expands when it freezes because of the strong, "Hydrogen bonding", intermolecular forces which exist between the water molecules in the liquid/solid.\nWhen water is a liquid, the molecules have much more freedom to move around and rotate any way they please, but when the water freezes into a solid, the molecules have significantly less energy (thus less freedom to move around) and try to take on the most stable/low energy state they can...which happens to be in a lattice structure which has a higher volume that when the molecules were in the liquid state.  So it is because of the Hydrogen bonding present between the water molecules that solid ice float in liquid water.
464226
Water mixes with water, rather than floating.  However, it is possible for warmer water to STRATIFY from colder - that is, the warmer water is on top while the colder is on the bottom.
718611
The soda has more heat than the ice.  Heat energy travels from areas of greater heat to lesser heat.  The heat energy in the soda leaves the soda to go to the ice which in turn melts the ice, and leaves behind a cooler soda.\n\nHeat moves....cold doesn't.
507086
Because water is most dense at 39 deg. F, therefore ice is lighter than water.
713171
No the molecules still weigh the same. With water the volume will increase, that's why ice floats. Most other substances decrease as they freeze.
747351
It's not heat that rises, it's hot substances. Heat itself has no mass and does not care where the gravity is pointing. However, the density of substances will vary with temperature. Most substances have a decrease in density as the temperature of that substance rises.\n\nThis is why it appears as if heat rises from a fire or your stove. The heat you feel is actually hot air that rises due to the force caused by bouyancy. This bouyancy is a result of the fact that warm air is less dense than cold air.
758754
materials usually expand when heated. Notable exception is ice which contracts when heated to form water.
557600
Water is one of the few substances that expands as it freezes.  From 4 degrees Celsius down to 0 degrees water expands and as a result the frozen solid form is less dense than the liquid form and that is why ice floats.\nThe water in the soft drink expands and the can cannot hold the increase in volume.