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Answered 2010-09-19 13:48:15

The melting and boiling points of a substance (in this case I am assuming you are referring to a pure substance, and not a mixture), are the same. The triple point is defined by the temperature and pressure at which solid, liquid, and vapor of a substance, can coexist in equilibrium. At any pressure below the triple point, only sublimation and condensation are possible (no liquid phase is possible).

Between the triple point pressure and the critical point pressure, there is a difference between the melting and boiling points, of a substance. The melting point temperature will be lower than the boiling point. At the critical point, the densities of the liquid and vapor phases, have merged, and boiling no longer occurs. At and above the critical point, you cease to get liquid and vapor, but you get what is referred to as a "supercritical fluid".

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A property is something that describes matter. Since every substance does not have the same boiling point or melting point these can be used to help describe the substance.


No. The melting and boiling points of liquids vary considerably.


Because they are unique to each pure substance. Different substances usually have different melting points, so determining the melting point of a substance can narrow down the possibilities for the identity of the substance. Likewise different substances usually differ in their boiling points, so boiling point can narrow down the possible identities of a substance. Although two substances can have nearly identical melting points or have nearly identical boiling points, it is extremely rare for two different pure substances to have BOTH the same melting point AND the same boiling point, so taking the two together is usually enough to uniquely identify a substance, or at the very least narrow it down to a very small list.


The boiling and melting points are very different.


Boiling and melting points are very different.


The melting point is the same as the freezing point; however, the boiling point is not the same as the melting point.


No..The melting point of a substance is the temperature at which it gets converted into a liquid from a solid...Whereas, the boiling point of a substance is the temperature at which a liquid, gets converted into the gaseous state. Melting point is the same as freezing point because the temperature at which a substance melts is the same at which it freezes also. The boiling point is the same as the condensation point because the temperature at which a liquid gets converted into a gas is the same as the temperature at which a gas gets converted into a liquid (Condensation).


The boiling point is when a substance changes from liquid to gas and the melting point is when substance goes from a solid to a liquid


It's because substances have different boiling point and freezing point. By finding the exact boiling point and freezing point, you can identify a substance. Keep in mind that a material's melting point is the same as its freezing point. These are just different terms for the same thing, it just depends on whether energy is being removed from a substance (freezing) or if energy is being added to a substance (melting). The same thing also applies to the boiling/condensation point.


Different substances usually have different melting points, so determining the melting point of a substance can narrow down the possibilities for the identity of the substance. Likewise different substances usually differ in their boiling points, so boiling point can narrow down the possible identities of a substance. Although two substances can have nearly identical melting points or have nearly identical boiling points, it is extremely rare for two different pure substances to have BOTH the same melting point AND the same boiling point, so taking the two together is usually enough to uniquely identify a substance, or at the very least narrow it down to a very small list. Also, surprisingly, if you mix two substances with the same melting point, the mixture will NOT melt at the expected temperature, so when you have a shortlist based on melting point you take your unknown and mix it with one of the suspects. If it melts at the right temperature, you have identified it. If not, you try the next one.


Melting points can be helpful in distinguishing different substances. Pure substances usually have a unique fixed melting point. Same goes for the boiling points.


The melting point and the boiling point of a substance are physical characteristics for each substance and are unchanged at the same pressure.


No, but the freezing point and melting point of a substance are the same.


The freezing temperature of water is 32 degrees Fahrenheit and boiling point of water is 212 degrees Fahrenheit. So freezing points and boiling points are not the same.





Only at the triple point (pressure plays a big role).


Iodine can sublime, i.e. change directly from solid to gas, at normal room pressure as long as the pressure is right, the substance can sublime


yes, for the same molecule. However, some substances don't have a liquid phase and so the melting point is exactly the same as the boiling point at normal pressures (sublimation is the phase change from solid -> gas)


The boiling and melting points are almost unique to individual substances. If it should happen that two possible substances have the same melting point, they can still be identified by the method of mixed melting points. If substances A and B have the same melting point and you mix them, the mixture will melt belowthe tabulated temperature. Thus if you mix your unknown with a sample of what you think it is, if you are right it will still melt sharply at the expected temperature, but if you are wrong it will melt gradually and at a lower temperature.


yes, i belive it does. however, the amount of water will change the amount of time it takes for either of them to occur. most water is not 100% pure, so boiling points can sometimes vary by a fraction. So the answer is melting and boiling points


Yes the melting and freezing points are the same.


No boiling is heating and energy is added and melting the solid turns into a liquid.


Physically I would expect to find the same boiling and melting points, and the same density. Chemically, I would expect the same reactivity with other substances.



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