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Answered 2015-01-23 18:31:58
Because after melting a substance must be heated further, to a higher temperature where the boiling is possible.
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How do melting points and boiling points help identify a substance?
A certain substance has certain melting and boiling points which is what helps identify a substance.
Boiling and melting points of pure substance?
The boiling and melting points of pure substances vary based on the substance. Gasses for example have lower boiling and melting points than metals.
What do impurities do to both boiling points and melting points of substance?
impurities lower the magnitude of melting point of as substance. And it increases the magnitude of boiling point.
What is the boiling melting and freezing point?
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.
Why boiling points and melting points can be used to identify substances?
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.
Are melting and boiling point physical properties of a substance?
Melting and boiling points are physical properties of materials.
What are the melting and boiling points of different substances?
The melting point of a substance is the temperature at which the solid phase melts to become a liquid (or the liquid phase of the substance freezes to become a solid). The boiling point of a substance is the temperature at which the liquid phase of the substance boils to becomes a gas (or the gas phase of the substance condenses to become a liquid). These points are different for different substances.
How do you identify solids at melting or boiling points?
Melting and boiling points are different for each compound or element.
What must the melting and boiling point be in order for a phase change to occur?
Melting and boiling points differ with the substance.
Do all liquids have the same boiling and melting point?
The boiling and melting points are very different.
Is boiling point is always same as the melting point?
Boiling and melting points are very different.
Why is the melting point and boiling point important?
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.
What are melting points and boiling points?
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.
Explain why the boiling point and the melting point can be used to help identify substances-?
Many substances have different melting and boiling points, thus one can use their melting and boiling points to identify them.
Are melting points freezing points and boiling points different?
Yes they are very different. It depends on the element that you are finding the melting and freezing point for.
What are melting and boiling points?
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.
What line represents boiling points on a phase diagram?
The melting or boiling point of a substance at a specific pressure
What do boiling point and melting point have to do with the phase of matter of an element at room temperature?
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.
How can a graph of Temperature v Time be used to fing the melting or boiling poit of a substance?
The graph becomes flat, constant temperature, at the melting point and boiling points of a pure substance.
What are the two ways in which melting points and boiling points are useful?
They are useful in (1) estimating the purity of a substance and (2) tentative identification of a substance.
Why are melting and boiling points considered to be properties of matter?
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.
How does boiling and melting point identify substances?
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.
What is the significant of boiling and melting point of substance?
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.
Why do compounds have high melting points and high boiling points?
Not all compounds have high melting points and high boiling points.
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