why co2 is a gas where as sio2 is a solid?
114277
Because in SiO2, polymerization occurs whereas in CO2 , polymerization is not possible. Polymerization of large no. of SiO2 makes it solid.
1178623
solid's particles are compact, while on liquids they are loose but gas' are the most loose (more distances with each other)
587553
It depends on the temperature and pressure.  At standard conditions (atmospheric pressure, room temperature), it's a solid.
754768
Carbon at room temperature and pressure is a solid, not a gas. If you raised its temperature enough to make it a gas, it would become highly reactive and would be too hot for you to breathe.
468561
In terms of molecular motion, molecules of a gas have higher kinetic energy (moving energy)than molecules of a solid do.\n\nBecause molecules of a gas have higher kinetic energy, they always move fast and they don't stay solid at any particular moment you observe (that's why you can walk through gaseous environment because molecules of a gas don't stay into a solid layer to stop you). Because they are freely moving like that, it will be energetically favorable to dissolve gas into other medium.\n\nIn contrast, molecules of a solid stay connected to each other (crystal lattice,...). When you want to dissolve a solid to other medium, you have to break up the bonds between molecules of the solid. Breaking up molecular bonds is energetically unfavorable; in other words, it takes up energy to break up chemical bonds and energy is not always available to do that. In the case of molecules of gas, they're already freely moving so at some moments, they just wander off and dissolve.
598488
Solid.  If the temperature is below the melting point, then it will be a solid.  Unless you want to get into changing pressures, or something.
1062405
silica is basically sand. it is a oxide of silicon (SiO2) ie. silicon dioxide
202502
The answer is very basic. Start with chemical names.  Carbon dioxide is made from carbon and oxygen. Carbon is called C, and Oxygen is called O. If you have two atoms of O, and one atom of C, then you have Carbon dioxide. The shorthand notaion for this is CO2. Don't be afraid of chemical formulas, but bring yourself to be comfortable with them, so you don't freak when you have to do a problem like this:\n__H4C + __O4Fe---->__HCO + __Fe. (this is balancing equations, but they're easy, once you learn to decode what chemical equations are trying to tell you )\n\nOn this website, just look at the ones that are relevant:\nhttp://www.ukrocketry.co.uk/forum/index.php?s=e26325e497d951d76619a79a0ad64ae7&showtopic=381\n\n\n\n\n\nThis si a segment on this from my school textbook: (sorry, its kinda long)\nA molecule or compound consists of at least two atoms that are chemically bonded. The chemical formula of a molecule or compound states how many atoms of each element are in one of its molecules. This formula is similar to an algebraic formula in its use of symbols. The description of a compound with numbers and symbols is called a chemical formula. Some formulae can be quite complex.\n\nQuestions you may have are:\n\nWhat are chemical compounds? \nWhat is the numbering system in a chemical formula? \nHow do you designate complex compounds? \nThis lesson will explain the basics of chemical formulas. \n\nChemical compounds\nA molecule is the chemical combination of two or more atoms. They can be of the same element, such as in the oxygen molecule (O2) or different as in the water molecule (H2O)\n\nA compound is a molecule that is made up of at least two different elements. The water molecule is a compound. When atoms of different elements combine to form a compound, the result is a new substance that has different properties than the original elements. A good example is when the poisonous green chlorine gas is combined with the explosive metal sodium to form the white salt crystals we use in our food.\n\nThe study of Chemistry is mainly interested in the formation of chemical compounds, since there are so many possible combinations of elements.\n\nChemical formulas\nChemical formulas (or more correctly: formulae) are designations of molecules and compounds in shorthand notation, similar to that used in Algebra.\n\nElements can be written as abbreviations or in a shorthand notation. For example, He denotes helium, Fe denotes iron, and Cl denotes chlorine. A chemical formula is writing the elements of a compound, using their abbreviations.\n\nThe combination of two or more elements to form a molecule is designated by writing their abbreviations next to each other. For example carbon monoxide is written as CO. The order in which the elements are written is typically alphabetical, but there are a number of exceptions for historical reasons and to clarify the geometry of the molecule.\n\nIf there is more than one atom of a type in the molecule, the formula shows it by a small number after the symbol. For example, water is H2O, which means there are 2 atoms of hydrogen and one atom of oxygen in the molecule. Carbon dioxide is CO2, which means there is one atom of carbon and two atoms of oxygen in the molecule.\n\nTo show the number of molecules, a full sized number is located in front of the molecule. For example 4 molecules of carbon dioxide is designated as:\n\n4CO2\n\nThis means there are a total of 4 C atoms and 8 O atoms in the combination. A way to remember this—taken from Algebra—is to think of it as 4 x (CO2).\n\nComplex formulae\nJust as in Algebra, you can use parentheses to separate parts in a complex formula. One example is the formula for nitroglycerin, a highly explosive substance.\n\nC3H5(NO3)3\n\nThis formula shows that nitroglycerin consists of 3 atoms of C, 5 atoms of H and then 3 molecules of NO3. If the parentheses were not used, you might have a formula like:\n\nC3H5N3O9\n\nThe number of atoms for each el
762753
The interactions between the carbon dioxide molecules are stronger, and thus it forms a solid at a higher temperature.\n\nIn water, the attractions are even stronger and you only need to go to zero degrees to get a solid. If you go to 100 degrees water becomes a gas. (temperatures in celcius)\n\nSimilarly for other molecules, if the atrraction between them is strong you get solids and liquids at higher temperatures than for less cohesive molecules.
943424
Oxygen itself is a gas of course.\nIn most kind of crystals you find oxygen atoms (or ions).\n\nTh
615100
the same elements except that \n-the ammount of CO2 inceases to 4%(not certain about the value)\n-the oxygen ammount decreeases to 16%\n-the water vapour ammount also increases
831858
Alaska, Arizona...Wyoming  :) just kidding.\n\nPure carbon is usually solid, but if heated enough could form a liquid or gas.\n\nSolid: Coal, Diamond\n\nCarbon compounds ..\nLiquid: Liquid Natural Gas\nGas: Propane, Butane, methane
817860
Dry ice isn't really ice at all; it is solid carbon dioxide.   It is -78C and the smokey vapour isn't CO2, it is water vapour that has been cooled by the dry ice.  Dry ice doesn't really melt either, it sublimes from solid to gas.
861257
different chemicals have different boiling points. while some chemicals boil at a very high temp, others boil at a low temp. once a chemical hits its boiling point it turns to a gas. so carbon dioxide has a very low boiling point and therefore is a gas at a temperature that is comfortable for us.\n\nat least i think that's what i understood from my high school sience class.
136772
It's a simple ion. There are carbonite, carbonate, and hypercarbonate ions as well, I'm guessing, that differ only in the number of oxygen atoms present in the ion. For example, for an ion named "hypo-something-ite" with 1 oxygen atom:\n\nhypo-something-ite: 1 oxygen atom\nsomething-ite: 2 oxygen atoms\nsomething-ate: 3 oxygen atoms\nhyper-something-ate: 4 oxygen atoms\n\nThis is what I remember from my high school chemistry courses, so I hope my memory isn't flawed.
795882
"Iodine, it is sublime". (Because it sublimates-goes directly from solid to a gas).\n\nGet an "A".
181746
the answer is CARBON DIOXIDE