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Answered 2010-08-26 15:09:22

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.

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


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.


Generally ionic substances have high melting and boiling points.


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


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


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.


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


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 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.


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.


At 1atm, the melting point of H2O(water) is 0 degrees celcius and the boiling point is 100 degrees celcius. Carbon dioxide's boiling point is at -25 degrees and so its meting point. Since it crystallises and sublimates, it has no liquid form. The boiling- and melting points of elements/compounds depend on the amount of pressure exerted on the element/compound. Generally, the higher the pressure, the higher the boiling and melting points. All except for water, gallium and bismuth. These substances' melting point decreases as pressure increases.


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.


Because different substances have different density and chemical make up.



Distillation separates substances on the basis of the boiling points of the substances.


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.


Not all compounds have high melting points and high boiling points.


All substances have melting points and boiling points. A melting point is merely the temperarture at which it changes from a solid to liquid and vice versa. The boiling point of a substance would be the temperature at which it changes from liquid to gas and vice versa.


Melting and Boiling PointsWhen heat is transferred in a space the average energy of the particles - the temperature of the substance - is affected, by increasing or decreasing. A substance will change it's state when it reaches certain temperatures - called boiling and melting points. At everyday temperatures on Earth, most substances are either gases or solids.


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


Different substances have different typical melting points, so by observing the melting point of something you can narrow down the options for what it is. Usually, metals have higher melting points and non-metals have lower melting points.


Solids have higher melting and boiling points than liquids and liquids have higher melting and boiling points than gases.


the conclusion is that the melting points and boiling points of various substances or chemicals are different. Some have m.p. but some don't have while some have b.p. but some don't have.it varies from chemical to chemical.


Because each compound has a specific boiling point (with some exceptions) comparing exactly determined boiling points we can identify compounds.



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