Do all atoms or molecules occupy the same volume at the same temperature?
107512
I’m not entirely clear in what question you are asking, but the answer is ‘No’, whatever you mean.\n\nAre you asking if, for example, a Uranium atom and a hydrogen atom occupy the same volume at the same temperature? If that is the question then the answer is an unambiguous “No”. Different atoms have different atomic radii. The atomic radius is a reresentation of how much space the electrons of the atom occupy at standard temperature (25oC). Since Uranium has an atomic radius orders of magnitude higher than Hydrogen it obviously occupies far more volume at the same temperature.\n\nExtending that, since U occupies more volume the H any compound made with U in place of H must also occupy more volume. Eg HO will occupy far less volume than UO\n\n\nOr are you asking if all atoms or molecules of the same type occupy the same volume at the same temperature? For example do all water molecules on a glass at 25oC  occupy the same space? In which case this is a trick question designed to make you think about the difference between temperature and heat. And the answer is still “No”.\n\nOr are you asking if two substances made of different molecules occupy the same volume? For example does a mg of water occupy the same space as a mg of ethanol.
499459
A very good question.\n\nAlmost all common chemical will contract upon freezing, but not water. \nThe special hydrogen bonding that forces the water molecule to be very close to eacher other in liquid phase.\n\nThe molecule of HOH is not straight, but in a V shape. About 105 degree.\nIn liquid phase the V shape can over lap each other. Go look up the water structure at\nhttp://www.chem1.com/acad/sci/aboutwater.html\n\nDuring freezing, the water molecule are force to line up, and the V shape molecule are line up side by side and no longer over lap.  This takes more room. So it expands.\n\nGo look up the ice molecule structure at http://www.uwgb.edu/dutchs/PETROLGY/Ice%20Structure.HTM\n\nIts not easy to see the true structure, but these will at least gives you a picture.\n\nKeep asking questions, enjoy.
795464
wow... opposite answers to the same question... hmmm In a sense, they are both correct. The volumetric changes experienced by solids due to temperature changes is very small, but there is a slight change indeed. Every solid has its own coefficient of volumetric change for every degree change in temperature. A prime example of solids changing volume are the expansion joints you see in bridges. Also, I think the empire state building is like 6 inches taller in summer than in winter... something like that. Gasses on the other hand experience much larger volumetric changes. Temperature as well as pressure will greatly affect the volume of a gas. Consider oxygen, it can be compressed to a liquid. \n\nOn the other hand, let me second guess this question, maybe it should read, why can a gas be compressed and not a liquid? In a gas, the molecules are spaced wide apart, farther apart than their electric charges do not affect the molecule next to them. In a liquid, the molecules are packed as tight as they physically can be packed. They cannot be compressed farther. Only temperature can affect the volume of a liquid as mentioned above. Hope this helps some!
425778
Isotopes of the same element have *almost* identical chemical properties. They can be distinguished because they have different masses (from a different number of neutrons in the nucleus). But this effect is usually very small. One exception is hydrogen. The isotope consisting of one protoon and one neutron in the nucleus (deuterium) has double the mass of a regular hydrogen atom, and this can have observable effects even on the chemistry.
538049
Yes.  In fact protons even from two different elements are indistinguishable.  This is a fundamental property that is quite interesting, and it results in some very odd behavior.
82591
As the solid decreases, the molecules pack together tighter.  Therefore the volume they take up becomes smaller.  The mass however remains the same.  Because density is equal to mass divided by volume, the smaller the volume, the bigger the density.
4524
It is physically impossible for two pieces of matter to occupy the same space at the same time, and this is in fact stated by the laws of physics, think about it, it's just impossible.  It doesn't matter if they  have different frequencies, it's matter, their atoms can touch or something, but never be at the same place as each other at the same time.
808773
Absolute zero is defined as the temperature at which all molecular motion ceases. More precisely though, it is when molecular motion reaches a minimum, because quantum effects guarantee there will still be a little bit of fuzziness in the position of the particles.\n\nElectrons, for example, do not collapse into the nucleus at absolute zero because they can only exist in certain well-defined, or quantized, energy levels.
989577
There isn't enough energy at near kelvin temperatures for molecules to do all their normal movements and fluctuations.  \n\nThe contrast to this state occurs at any temperature above 'near absolute zero', take for example the nominal temperatures we are comfortable with.  At this temperature there is more than enough energy available for a molecule to bend and vibrate in literally millions of ways....these vibrations occur on the picosecond timescale and for the most part, all accessible ways to vibrate and bend.\n  As the temperature is reduced there are less vibrational modes available and the more high energy ways to vibrate (generally those involving less favourable configurations) start to not occur.  \n\nThe vibrational efficiency and capability of a molecule thus decreases to the point of a few possible vibrational modes as absolute zero is approached.
112298
Ideal gas laws assume that all particles are spherically symmtric and engage only in elastic collisions.  They ignore all other types of molecular energy (rotation in other planes of symmetry or asymmetry, bond stretching/compressing/bending, rotation about a molecular bond--all these things can and do absord energy from a collision), and they negate the effects of all intermolecular forces, like dipole interations, hydrogen bonding, London dispersion forces, etc.\n\nIn gases like helium, the atoms are basically spherically symmetric, and most of these random forces are neglible.  Hence, ideal gas laws work really well for these--only at really ridiculously low temperatures and high pressures do these forces manage to liquify helium.  The larger you molecule is--and I'm not talking about mass so much as the number of chemical bonds--the less ideally it behaves.  The greater the heterogeneity of a gass, the less ideally it behaves.  The greater the polarity (eg seperation of charges) displayed by the molecule, the less ideally it behaves.
339529
matter is something tht has mass and occupies space it exist in three state solid liquid and gas\n in solid state the intermolecular spaces a less and thus the object appears to be rigid\nthe liquid and gaseous state together r known as fluids.\nin liquid state the intermolecular spaces r relatively larger than solids hence they can flow.\nin gaseous state the molecules r very far apart fr each other.\n\nsome times matter exits in all three states simultaneouly at certain temperature and pressure this is know triple point of tht substance --- eg:- the triple ponit of water is 273.16K and 613pa of pressure ie water exists in all three states at this temperature and pressure.
1108940
Well, it doesn't, really, except that since the law of definite composition says that substances always have the same ratio of the same atoms, they're going to have the same properties, including density (mass per unit volume).  Water is always two hydrogen atoms to one oxygen atom, and will always have a density of 1.00 grams per milliliter at 4 degrees Celsius.  Same applies to all other substances.  In terms of it relating directly to volume, though, it doesn't.
501359
yeaaaaah\n\nit's "expand and rise"\nthe energy (heat) supplied to it causes the individual molecules to have more energy and because of it, they expand further, and rise since density is lowered and volume is increased
374421
mass=density over volume\n\n=)
498491
This is an subject area where vocabulary is vital for clear understanding, to a degree I am not capable of, however the stuff that you ask about are so small that the only way to attempt to prove their existence is through mathematical formulae based on what we suspect to be true. Our lack of understanding on this subject, which is still very voung, means the answers available are sketchy at best compared to our understanding of molecular structure or atomic structure.\nWhat is known so far can be found in places like the noetic sciences knowledge centre, or wikipedia.
290402
Yes. Since temperature is a measurement of average kinetic energy of an atom, when you get to the point that atoms disassociate (come apart), you no longer have anything to measure.\n\nHowever, above that certain point, the kinetic energy of a system is measured by particle energy.\n\nIf you look at big bang theories, you will note that the universe began at a high temp, which would probably be the maximum.
794990
Molecules and atoms interact with one onother during a chemical reaction. If atoms are indivisible then they cannot be destroyed during a chemical reaction. If atoms cannot be destroyed then the mass of reactants must equal the mass of the products in a chemical reaction. e.g.,\n\nReactants -------> Products\n\nMass of Reactants = Mass of Products