what is the chemical and physical change inside a can when it is heated then placed in cold water.?
470974
The can and the air inside it expand. The can doesnt expand much, but the air does and a bunch of it flows out. When the can is placed in the cold water the can contracts really quickly and because there is less air pushing back on the walls it crunches up. There is nothing really big happening chemically.
795875
A physical change is when a substance undergoes a change in form, but is still the same chemical composition. Some examples of physical changes include change of state (liquid water to steam), size (cutting paper in half), shape (folding paper), dissolving (ice tea crystals in water), and mixing (red and white paint). In any of the above situations, the chemical make up of the original stays the same. (Eg. liquid water is the same as steam or ice).
308806
Consider a liquid (water) and its gas (steam).  To convert water to steam, you first have to heat water to 100 C.  At that point additional energy begins to boil the water.  This is the process where water molecules have enough energy to overcome the attractive force between them (called cohesion, in this case, due to the dipolar attraction between waters).\n\nYou are right in that gases are higher energy (could say hotter), but that's because they've taken the energy from whatever heat source was around when they vaporized.\n\nBack to the water example, water on your skin feels cold because it's absorbing heat from your skin and as the water evaporates, that heat is carried away by the vapor phase molecules (which are moving faster than the liquid form).\n\nThe fast-moving particles from your question have a lot of heat stored, that's why steam at 100 C is more likely to burn your skin than water at 100 C.  It has more heat to transfer.\n\nAs for freon, it depends on which freon you're talking about.  Freon 12 (one of the ones phased out because of ozone depletion) melts at -158 C (Merck Index).
754837
ice cream melting- physical change as wwhen u freeze liquid ice cream it turns back to ice cream.\n\nsugar dissolving in water- chemical as once the sugar is dissolved ou have to use chemical meathods to get the sugar out from the water.\n\ncandle burning- chemical as when the candle is burning it orduces heat which cannot be got back if we rebuild the melted candle.\n\nbathroom mirror fogging up during a shower- physical as you can wipe the fogg out and if you want it agun have a hot tub of hot water near the galss.\n\nmilk turning sour- chemical as you cannot use phusical methods to turn sour milk into milk.\n\nhope it really helps!!!!!!!!!
89574
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.
377330
Salt, NaCl, turns into Na+ and Cl- ions in water.\n\nThe ions changes the equilbrium of H2O melting and freezing.\nLiquid water is block by the ions, so it has a harder time freezing back onto the ice. Since the ions doenst slow down\nthe melting of ice, but slows down the freeze of water.\nThe ice now melts at below 0 degree.\n\nSo a normal ice water will be at zero degree.\nBut a salt put on the ice/water will melt more of the ice at a lower temp., about 7-10 degree colder, depenting on the ammount of salt and ice avalibale.
30270
In general, a gas turns into a liquid by cooling it.
797125
The heat lost by the warmer water will equal the heat gained by the cooler water.  The change in the heat will equal \nq = (s)(m)(T1 - T2)   where q is the heat change (units of Joules (J)), s is the specific heat of water (4.184 J/gK), m is the mass of the water in grams, and T1 and T2 are the initial and final temperatures of the water samples in Kelvin.  Assume the density of water = 1.00g/mL.\n\n(4.184J/gK)(30g)(Tf - 280K)  =  (4.184J/gK)(50g)(330K - Tf)\nTf is the final temperature of the combined solutions.\n\nSolving for Tf:\nTf = [50(330) + 30(280)] / 80  = 311K
480166
If you have an equal volume of hot and cold water the cold water will be heavier.  This is because when you heat up a substance it become less dense, and in general when you cool down a substance it becomes more dense.\n\nThe exception to the rule is water though.  Water is most dense at 3 degrees cesius, after that it start to take a crystalin form and when it freezes actualy expands.  \n\nso long as you are not saying that the cold water is 1 degree and the hot water is 3, then the cold water will be heavier\n\n\nBut remeber it is not by much in any case
932412
Well, if you're talking about water, that would be 0 degrees (freezing) and 100 degrees (boiling)
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.
889742
Fuels like gasoline are really a cocktail of hydrocarbons. Thicker, oil-like stuff at room temperature with some thinner ones, and also aromatics that are gaseous at room temperature. So by freezing, you mean, when does it turn solid? The heavier hydrocarbons will start to solidify sooner than the aromatics. \n\nThe flash point of gasoline is about -97F, meaning that it will still burn at 97 degrees below zero. Most labs won't even have the ability to chill a sample down that far to find out! Even the -97F mark is going to vary, based on the additives in the sample. \n\nOf course, if there is any water mixed in with the fuel, it can still freeze at around 32F, but that may depend on if there are any alcohols mixed with the sample. Methyl alcohol is a common additive you can buy to help keep water in your gas tank from freezing at low temperatures. \n\nThe thicker, heavier hydrocarbons, like paraffin will become solid at atmospheric temperatures. Some of the aromatics won't turn solid until -200F to -300F.
378824
Temperature affects state change. If something, for instance water, is heated, it becomes a gas. Gases take up more volume than liquids. So the hotter a gas is, the larger it will expand, and the same is true, to a lesser degree, for solids and liquids. Hope I helped,\nZ
620539
a chemical change changes the structure of a substance and a physical change doesn't.\n  chemical change:\n  when the gas leaves the water H2CO3= H2O + CO2\n  melting of a metal\n  physical changes:\n  boiling water\n  cutting a piece of metal in half
274980
Since there is no temperature change in the substance, only a phase change (solid --> liquid), all you need to use is,\nQ = Lm\nwhere Q is the heat energy, L is the latent heat of fusion, and m is the mass of the substance.\nI dont happen to know the latent heat of fusion for water (I think it is like 2260 J/g, maybe), but I am sure it is in your book somewhere.\nJust plug the values into the formula and you are set.\n\nEDIT:\nThe Latent heat of fusion of water is 333 J/g.\nThe latent heat of vaporization is 2260 J/g.
654039
its actually temperarure, pressure and polarity.\n\ntemperature increases then solubility increases\n\npressure increases then solubility decreases.\n\nand by the theory 'like dissolves like' polar is dissolved in polar solvents and vice versa.\n\n** though at room temperature, temp factor shall not have effect as temp remains constant
743249
Physical Changes:\n1.The ice in your glass melts, turning a solid to a liquid\n2. The steak browns on the grill\n3. The potatoes are mashed\n4. The carrots are diced\n\nChemical Changes:\n1. You add lemon to your ice water\n2. You add cream to your coffee\n3. You burn the steak, producing carbon\n4. You clean the sink with baking soda