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2010-10-30 20:20:01
2010-10-30 20:20:01

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

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


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


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.


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


impurities lower the magnitude of melting point of as substance. And it increases the magnitude of boiling point.


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.


Because after melting a substance must be heated further, to a higher temperature where the boiling is possible.


Melting and boiling points are physical properties of materials.



The melting point can help a scientist identify a substance.


A boiling point is a point on the temperature scale at which a substance begins to boil. A melting point is a point on the temperature scale at which a substance freezes. Melting and boiling points are unique to different types of elements.


The melting point of a substance is the (thermal) point at which a solid substance gains enough thermal energy to become a liquid.The boiling point of a substance is the (thermal) point at which a liquid substance gains enough thermal energy to become a gas.Boiling point of water: 100 degrees C/ 212 degrees FMelting point of water: 0 degrees C/ 32 degrees FMelting points and boiling points are the temperature at which substances change state.Melting point - solid to liquidBoiling point - liquid to gasThese temperatures will vary depending on the properties of the substance.


The melting or boiling point of a substance at a specific pressure


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.


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.


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.


The state of matter of a substance at room temperature depends on whether the melting and boiling points are above or below room temperature. At room temperature:A substance is solid if both the melting and boiling points are above room temperature.A substance is liquid if the melting point is below room temperature but the boiling point is above room temperature.A substance is a gas if both the melting point and boiling point are below room temperature.


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


They are useful in (1) estimating the purity of a substance and (2) tentative identification of a substance.


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.


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.


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.


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


Physical property is a property that a substance has which can be measured. For instance, some properties are melting points or boiling points.



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