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Why are sublimation points and decomposition points less useful to a chemist than a melting point?
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Are the boiling points higher temperature than the melting points?
yes, for the same molecule. However, some substances don't have a liquid phase and so the melting point is exactly the same as the boiling point at normal pressures (sublimation is the phase change from solid -> gas)
Do nonmetals have higher melting points or lower boiling points?
lower melting points
Do proteins have definite melting points?
Different proteins have different melting points.
What is effect of decreasing pressure on solid carbon dioxide?
normal melting and boiling points are those when the pressure is 1 atmosphere, Solid CO2 gets converted to gaseous state (sublimation) on decrease of pressure to 1 atmosphere
Does polythene have a high or a low melting point for a plastic?
Tungsten is a metal with a particularly high melting point (which has made it suitable for use as a filament in incandescent bulbs); ionic compounds such as granite have high melting points. Ceramics have high melting points.
What two uses do chemist put the melting points of substances?
- a substance can be identified after the melting point because it is a specific physical characteristic- melting points knowledge is necessary for technology
How do you determine melting point of a compound that sublimes or decomposes before melting?
You don't. You determine the sublimation point or the decomposition temperature instead. In a table of melting points, such a compound would have a temperature listed along with a notation along the lines of "subl" or "dec".
Are the boiling points higher temperature than the melting points?
yes, for the same molecule. However, some substances don't have a liquid phase and so the melting point is exactly the same as the boiling point at normal pressures (sublimation is the phase change from solid -> gas)
Why diamond and graphite have high sublimation points?
diamond and graphite are held together by extremely strong covalent bonds, which results in high sublimation points
Do nonmetals have higher melting points or lower boiling points?
lower melting points
Which ions have high melting points?
positive ions have high melting points
Do proteins have definite melting points?
Different proteins have different melting points.
Compared with the melting points of ionic compounds the melting points of molecular solids tend to be .?
Ionic compounds have a higher melting point.
Do liquids have melting points?
No, they only have freezing points & gaseous points (it where the liquid becomes a gas). Why don' they have melting points? Well take this as an example: If you left your chocolate bar out in the sun it will melt and become a liquid. There for becoming a liquid IS melting, there is no further melting points to an object ounce it becomes a liquid. Substances have melting points. The melting point is the temperature at which a solid becomes a liquid, in other words, the temperature at which it melts.
What is effect of decreasing pressure on solid carbon dioxide?
normal melting and boiling points are those when the pressure is 1 atmosphere, Solid CO2 gets converted to gaseous state (sublimation) on decrease of pressure to 1 atmosphere
When magma cools minerals with higher melting points will?
Minerals with higher melting points will crystallize.
Does polythene have a high or a low melting point for a plastic?
Tungsten is a metal with a particularly high melting point (which has made it suitable for use as a filament in incandescent bulbs); ionic compounds such as granite have high melting points. Ceramics have high melting points.
