changeing from liquid to gas , the molecules moves faster , i thought faster moveing particles create heat
129427
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).
576373
a) \n\nThe molecules in a substance are in constant motion. Now there are two oppposing forces on a substance. One is the intermolecular bond energy that tries to keep the molecules together. The other is the kinetic energy of the molecules that tries to push the molecules apart (these two forces work together to keep substances in equilibrium - basically keeps it from exploding or imploding in simple terms).\n\nNow, in solids, the molecules have low kinetic energy but high intermolecular bond energy(IBE). Liquids, the kinetic energy is higher and conversely the IBE is lower. Gases, the kinetic energy is high and the IBE is low (makes sense - the "bond" is weak)\n\nSo now, the kinetic energy or molecules is directly proportional to the heat applied - the hotter it is, the more kinetic energy the molecules have. Therefore when you heat it ... the kintic energy gets stronger and stronger and the IBE gets weaker and weaker until it breaks and the substance undergoes its change of state.\n\nHope this explained it well!
286162
a.)\n\nIn a liquid or a gas, not all molecules have the same kinetic energy.  Temperature is just a measure of the average kinetic energy.  There is statistical range of kinetic energies.  Those molecules that have the higher kinetic energy may escape from the liquid into the gas phase.
262697
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.
443421
When you heat a solid, you are giving all of the particles more energy. This means the vibrate faster and so take up more space - expanding the solid.
258383
TO CAUSE THE CHANGE CHEMICAL REACTION
408739
b   the fuel burns and and creates heat the hot gas expands and drives the piston creating work
667546
When the temperature rises, the particles of the mercury in the thermometer gain kinetic energy. This means that they start moving around more vigorously. The particles push away neighbouring particles. This increases the space between the particles and causes an increase in the volume of a mercury. Expansion is said to have occured.
442422
I answered your previous post....  It seems like you don't understand the process of evaporation (turning from liquid to gas).  For example:\nAt 100 degreesC, water can be a gas, a liquid, or both.  However, as a gas at 100C, water vapor contains more energy than liquid water at 100C.  The process of evaporation (turning liquid into gas) requires energy that is not registered as an increase in temperature.  Each change in state (solid to liquid, liquid to gas) requires and "extra boost" of energy not registered as temperature to the material changing states. (Also think about ice water...)\nSo, when the the compressed liquid refrigerant is allowed to expand and turn into gas (evaporation) the surrounding energy within the refrigerator "boils" the the refrigerant giving the refrigerant the energy to turn into a gas...\nThis whole process would not be possible without the compressor.\nThe refrigerant gas, normally pure ammonia, boils at       -27C @ ambient pressure.  But through compression it is turned into liquid at room temp.  But when it is allowed to expand in the coils within the refrigerator it quickly boils turning into a gas "absorbing" the required energy from interior of the refrigerator....  So, if some how the inside of the refrigerator was -30C the liquid ammonia would fail to turn into a gas and the liquid amonia would actually be warming the interior since it was initially a liquid at room temp....
593195
More intense vibratory movements from the molecules mean more thermal energy transfer to the matter which become in contact with it.  So you can burn your skin if the object you touch is really too hot!
551762
It goes into energy storage modes of the water molecule.  One is vibration, another is translation or kinetic energy.  The water molecule travels faster.  Steam at 100 C burns much worse than water at 100 C because although the temperature is the same the energy is much higher.
441199
It is one of the ways heat is transported.  The other two are conduction and convection.
639147
You are quite right that what is meant by the term energy is at best often ambiguous, and saying energy can convert from one form to another is unhelpful because it introduces "flavours" of energy. This confusion has historic origins - at one time, different forms of energy were thought to be different and it was not obvious that they were interchangeable of equivalent.\n\nThe easiest way to think of it is this.\n\nThere are two ways in which a particle can be said to have energy.\n\n1. it is moving (including vibrating)\nthis accounts for many of the things you think of as energy - heat is vibrating molecules, electricity is moving charge etc, and of course a speeding bullet has "kinetic energy"\n\n2. it is in a potential\nthis means it is being pulled by one of the forces of nature (gravity, electrostatic or strong nuclear) - if it "gives in" to this force it will accelerate (ie move) and have energy of type 1, and hence this is often called potential energy\nthis accounts for things like the energy in chemical bonds, nuclear energy, the energy in springs etc\n\nNow you can see that you can convert energy associated with moving to energy in a potential. For instance, if i fire a bullet in the air, first the chemicals in the explosive react. This means the electrons rearrange to have a little less energy in the potential created by the nuclei, and this energy is release. The released energy is converted to the energy of motion of the bullet. The bullet flies into the air against the force of gravity and it gain gravitational potential energy as it rises; it also slows down so it is losing kinetic energy.\n\nOne of the triumphs of science was to show that all of these energies are the same - i.e. that none is gained or lost.
143220
I believe u change the heat energy\n\nNo\n\nYes\n\nYes, I think\n\n?
378866
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.
551197
no, it wouldn't be easier.  Certain compounds have lower melting points than others.  Lipids for example, if you cool your body down too much become very rigid.  The resulting body temp is actually in a very important lipid range that deals with lipid and membrane fluidity.  Evolution to this is probably the result of species out competing those with lower internal temps.  Besides, our bodies naturally produce a very high amount of heat non-related to cell temperature regulation as a result of moving and living anyways.
564889
simple answer: expands till you heat it enough, then it breaks apart. (The gas breaks apart at the molecular level)\n\nbetter answer:\n\nWhen you increase the temperature of a substance the molecules store the energy in different forms. Forms such as vibrations, stretches, and translational motion. As the temperature is put in the system the air will increase its molecular motions (vibrations, stretches, translations...) the air becomes hot and the molecules move much quicker due to absorbed thermal energy. If you heat it enough you will rip apart the molecules and possibly start seeing a purple plasma. You can do this easily with a high voltage teslacoil.\nIf the closing material is fragile enough you can cause a pop! \n\nAdditionally, when fluids are heated the oxygen is removed slowly thus reheating can lead to superheating.\n\nAs you heat gasses, depending on their stucture, you can begin different modes of motion and change the heat capacity.