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2014-08-21 14:57:06
2014-08-21 14:57:06

The boiling and melting points of pure substances vary based on the substance. Gasses for example have lower boiling and melting points than metals.

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The graph becomes flat, constant temperature, at the melting point and boiling points of a pure substance.


Pure substances have very specific melting (and boiling) points. Assuming the substance is pure you could measure the melting point and compare it to a known database of melting points.


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.


A pure substance generally has fixed melting and boiling points. Note it must melt or boil without decomposition. The measured values can be used as a guide to identification. Remembering that impurities depress the melting point and elevate the boiling point the "sharpness" of the melting/boiling point is an indication of purity.


Each pure substance has its own unique melting and boiling point.



A pure homogeneous substance will exhibit very specific properties such as melting or boiling points. These properties will be consistent in their results every single time if the substance is truly pure.


No, boiling points are always higher than melting points. When you turn a solid to a liquid, this process is called melting, and requires a lower temperature than boiling the substance. Take ice water for example. Ice becomes pure water at 0oC. The temperature needed to boil pure water is 100oC, which is a bigger number than zero.


The presence of the impurities will cause the boiling points to rise (also the melting points to fall). When you add the impurities, the substance doesn't remain pure affecting the boiling point to increase because now, more energy is required to boil the liquid with impurities. The melting points fall because impure substances require less energy to separate the particles.


These are substances that contain only one type of atoms/molecules. For example, diamond is a pure substance. Diamonds are made of strictly carbon atoms. Melting points and Boiling points of pure substances always remain constant !


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.


If you know the melting point and boiling point of a substance, you could look them up in a table to see what substances have those melting and boiling points. In practice, there are lots of other tests you'd probably want to do in addition, because in general there's no guarantee that an unknown substance is a single pure compound.


Check the melting or Boiling point. If the melting and boiling point is more or less than the original melting or boiling point the substance is impure.



The purity of any substance can be checked through Melting Point,Boiling Point or Chromatography. As A pure substance has a set and exact melting point and boiling point and a pure substance shows only one spot on the chromatogram.


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".


A Pure Substance is one in which all the molecules are of the same kind .It is either an element or a compound .The characteristics of pure substance are melting point and boiling point .


The melting point and boiling point of a pure substance are very specific numbers; knowing these allows you to narrow down the possible identity of the substance.


Impure substances have different melting/ freezing points than their pure counterparts because the substance that was dissolved into the pure substance had a different melting point (higher or lower depending on the substance). When the freezing points of the two substances average out, a new freezing point is created. The freezing point/ melting is not necessarily lower


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


Boiling point- the temperature and pressure at which a liquid and a gas are in equilibrium. But also, it is very useful in determining the purity of a substance. If the melting point is known of the pure substance, than you can measure the melting point of what you've got and see if it matches. If the melting (or boiling) point is the same, than that is a good indication that the compound you have is what you think it is, and it is pure. If they are different from each other, that indicates that your compound is not pure.


The centigrade scale is based on the melting and boiling points of pure water at 1 atmosphere of pressure. 0oC is the melting point and 100oC is the boiling point.


If it is a pure substance, you could use melting point, boiling point, and density.


A material that contains only one type of matter is a pure substance. Its physical properties are well-defined boiling and melting points.



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