why a mixture has a b.p. elevation?
968042
Boiling is vapour pressure phenomenon. A liquid always exerts a pressure in the space just above it due to evaporation of its surface molecule which is called vapor pressure of that particular liquid and as temperature is raised the vapour pressure goes on increasing. When vapor pressure of the liquid exceeds atmospheric pressure liquid starts to boil.\nin case of a mixture, the solute molecules bind the molecules of the solvent and thus there are fewer surface molecule available to evaporate from the liquid surface. Due to which vapour pressure exerted by a mixture is always less than vapor pressure of pure solvent. To make vapor pressure of mixture to reach the atmospheric pressure level its temperature should be raised more than temperature of solvent alone. Thats why a mixutre has a boiling point elevation.
436516
A liquid mixture of two or more substances that retains the same composition in the vapour state as in the liquid state when distilled or evaporated under some conditions
139288
I think this would be a good topic for a college paper, especially if you go into the details and work it all out carefully. \n\nThe previous answer is correct. I might add a few comments to help, however. \n\nIt comes down to density, and buoyant forces. If there is an unbalanced force against something, then it will accelerate because of Newton's second law. If the force from below on a parcel of air is less than the force of that parcel of air downwards (due to its weight, and pressure from air column above), then the parcel of air will sink. And if the force from above is less than the force from below, the parcel of air will rise.\n\nThe smoke is composed of gases and suspended particles in the air that can be quite small (small enough to be about the same size as the wavelength of light, and cause selective scattering, creating phenomena such as a blue moon). \n\nTherefore, smoke can rise or fall, depending on the forces acting on a parcel of air containing the suspended smoke particles. \n\nThe density of the air, and the pressure it exerts, depends on the temperature. A good first step is to assume that the air parcels satisfy the Ideal Gas Law, PV=NRT, where P is the pressure of the parcel, V is the volume, T is the temperature,  R is the universal gas constant, and N is the number of molecules. \n\nThe pressure at the bottom of an air column of uniform density gas of height h is rho*g*h, where rho is the density and g is the acceleration of gravity. \n\nThere is a lot of material about this on the internet and in other places. Hopefully our comments are enough to get you started on this, so you can analyze this carefully and write a nice paper.\n\n----------\n\nAddendum:\n\nAs the next answer states, and as in the reference, the constant n is typically used for number of molecules and the constant N is typically used for number of moles. I apologize.\n\nSo it is \n\nPV=NRT, or alternatively, PV=nkT\n\nwhere k is the Boltzmann constant. See the reference attached.
951269
For all practical purposes, if a solution is saturated (can not dissolve any more) it is full and all others will fall to the bottom, undissolved. \n\nRealistically a small (very small) amount of the other powder could dissolve if it had different enough properties.
473183
"Mounting" elevation.\n\nDo you mean mountain?
73838
Its' probably a rounding error. It would depend on which masses for the elements you use, how precise you want to be.
773650
I'm not sure what you are trying to ask here.  come positive ???\nWere you going for "composite" here. If so, it means a mixture of different components.\nYour question is not clear enough to attempt more of an answer than this. Sorry.
784949
Additional information is needed.  The mixture could contain one atom of Potassium and the rest Sodium or the reverse.\n\nThe total mass of the sample does not tell you anything about the relative mix.
922889
Because air at ground level and a significant distanace above is rarely saturated - when it is, fog forms - which is a cloud on the ground. It has to be saturated a significant distance above ground or else you only get shallow areas of ground fog or dew/frost (if it is unsaturated say 50-200 feet above ground).\n\nBases of what we normally consider to be clouds rarely touch the ground because rising air motion is required to saturate the air and form the cloud. If it has to rise to do that, it cannot occur on the ground - though such clouds can be advected to a higher location and perhaps reach ground level there - or as is more common, the rising motion occurs up a slope with a cloud forming at some point along it.
304287
This is called Base line correction.\nYour solvent may be having some absorption, or the impurities in it may be having some absorption..so to measure your compunds absorption exactly, you need to take the solvent (n whcih you are going to dissolve your compound later) and do this base line correction.\nIn a way you are telling instruments "NOT TO WORRY ABOUT THESE ABSORPTIONS"\n\nThats it\nYou got it?
650618
well i think it is option B.....\ncoz..bronze is mixture not compound ..of the folowing elements...coz we can separte the elements which made it...coz in cpomunds elements lost their individual charactersitics..but in mixture they retian them...\nand zinc ,tin,copper r elements not compunds..coz compunds made up of 2 ..to more elemnts.while zince tin,cooper r themsleves are elemnts coz these r have standards at.no and wt.n presents in periodic table..which show elements
843827
Lets start with the pure substance.  It is all the same element or compound.  Solid, liquid or gas, the entire sample is exactly the same no matter where we look at it.  It is considered homogeneous.\n\nTwo or more pure substances when mixed to become homogeneous are called a solution.  Solutions can contain solids, liquids or gases but must be homogeneous (the same in all areas).  Most important solutions contain one or more solids dissolved in a liquid.  The solids are called solutes and the liquid is called the solvent.  When the solutes are mixed with the solvent, the homogeneous solution is formed.\n\nA mechanical mixture is a mix of substances where the final sample is not homogeneous.  Sand is a good example.  Even if fused into sandstone, some areas are different than other areas.  These are called heterogeneous.  Smoke floating in air is heterogeneous.  It is also a mixture.\n\nImpress your teacher with this example of a sample which contains only one element, but is still a mixture.  Diamond dust mixed with graphite dust.  Both diamond and graphite are made of pure carbon, yet the mixture is heterogeneous so it is a mechanical mixture.
1000766
The low technology approach is to use a densitometer.  This can be as simple as a hydrometer as used in the brewing industry to check for specific gravity (density).  From a measured density and a known volume and if you know the densities of both liquid components of a binary mixture you can work out the relative proportions of each using simultaneous equations and hence the concentration of one in the other.
701102
Higher elevation is, obviously, higher than lower. It is more above sea level. The higher the elevation the more weather you have (i.e. snow)
741182
A mixture is made up of different kinds of particles. You can separate mixtures into their different particles.\n\nA pure substance is made up of one kind of particle. Pure substance are classified as either an element or a compound.\n\nMixtures are then classified into heterogeneous mixtures (where you can see different kinds of particles with your own eyes... ie. sand in water, dirt) or homogeneous mixtures (aka solutions) (where you cannot see different kinds of particles... ie. sugar mixed in water).
1067508
depends if the mixture is bonded by a physical or chem bond....there is magnetic separation,distillation,fractional distillation,evaporation,crystallization...etc...why dont u look up a chemistry book
981841
area of the base times the height.