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Answered 2015-02-08 18:57:35

Many substances have different melting and boiling points, thus one can use their melting and boiling points to identify them.

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cause all pure substances have a fixed boiling and melting point unless impurities is added their boiling and melting will always remain the same.


You can compare them to tell one liquid from another. All solid substances melt at one temperature only.


A certain substance has certain melting and boiling points which is what helps identify a substance.


Melting and boiling points are different for each compound or element.


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.


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.


yes. each substance has a differant melting and boiling point.


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


Generally ionic substances have high melting and boiling points.


Impurities can increase or decrease the melting and boiling points of substances depending on what the impurity is.


This is possible because the melting and boiling point are specific properties.


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.


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


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.



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


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.


Not all substances have a boiling and melting point; some are thermally decomposed at high temperatures.


liquids: boiling point, density, ability to dissolve salt, flammability solids: melting point, crystal shape, solubility in water and alcohol


color, crystalline structure, melting point, boiling point, hardness, magnetic properties, X-ray diffraction data, etc.


In order to identify metals, testing on their properties comes in handy. On heating, metals will have high melting and boiling points. At the same time, materials that conduct heat and electricity are most likely to be metals.


the melting point and the boiling point generally decrease as you go down the group


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.


Melting points and boiling points are phyical constants which means specific compounds have specific melting/boiling points. Therefore you can identify a substance if you determine the mp/bp. Also you measure the purity of a mixture using melting point tests.


Because different substances have different density and chemical make up.



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