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Similar to dry ice (solid CO2), pressure is necessary for the formation of liquid naphthalene.
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Experiment for pure and impure naphthalene?
It is easily checked by melting point of Naphthalene, if it is pure its melting point is 79 Celsius otherwise less than 79 Celsius.
What will melt faster pure or impure naphthalene?
Remember that the more impure the lower the melting point.
What happens when a solid is heated and it's temperature rises without melting?
It heats up, until it reaches the melting point or sublimation point of the solid.
The phase change in which a substance from a gas directly to a solid is called?
The melting point.
Can potassium chloride andsodium chloride be separated by sublimation?
No, because neither of them sublimate at 760 torr (1 atm). They melt. You could separate them by melting point, as NaCl has a melting point of 801ºC, but KCl has a melting point of 770ºC.
What does a Graph of melting point and freezing point of naphthalene look like?
what does a graph of melting point an freezing point of naphthalene look like
Naphthalene has high or low melting point?
low melting point
What happens to the temperature of naphthalene during melting?
Lab: Melting / Freezing Point of NaphthaleneObjective: In this lab, you will investigate the melting and freezing point of the substance, naphthalene (moth ball flakes). You will heat solid naphthalene and record temperature changes and examine the graph to determine the melting point of the substance. You will then cool naphthalene and record temperature changes in order to determine the Freezing point of the substance Part A: What happens to temperature as naphthalene melts?Objective: As heat is applied to liquid naphthalene, the temperature rises. As the temperature rises, the naphthalene will eventually start to melt. This lab experiment tries to answer the question: what happens to the temperature of naphthalene as it melts? In this lab, you will heat the liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.Part B: Determining the freezing point of naphthaleneObjective: Freezing point is a characteristic property of matter. As heat is taken away from a liquid, the temperature of that liquid decreases as the substance begins to freeze. This lab experiment tries to answer the question: what is the freezing point of an unknown liquid (naphthalene)? In this lab, you will cool liquid naphthalene, and record the temperature changes. You will graph the temperature changes before drawing any conclusions.
Can you separate mixtures of ammonium chloride and naphthalene by sublimation?
yes but only by fractional sublimation (sublimating point of these substances are different)
Experiment for pure and impure naphthalene?
It is easily checked by melting point of Naphthalene, if it is pure its melting point is 79 Celsius otherwise less than 79 Celsius.
What is the Hypothesis of the melting and freezing point of naphthalene?
The higher the temperature, the more the naphthalene to be melt.
What is the difference melting point of sodium iodide and naphthalene?
NaI has ions and has strong electrostatic force of attraction, hence high melting point. Naphthalene has weak van der Waals forces of attraction between the molecules and hence have low melting point.
Why naphthalene sublimes at room temperature if its melting point is 80 degree?
The definition of sublimation is when a material goes directly from solid to gas phase, without melting first. If the material is liquid and it transforms to gas, that's called evaporation (when it's gradual at any temperature) or boiling (when it all starts to change state at the boiling point). Whenever a solid vaporizes into gas phase, that's called sublimation. Naphthalene appears to sublime below its melting point because molecules are constantly leaving the surface (it has a high vapour pressure) and these molecules disperse into the air.
What will melt faster pure or impure naphthalene?
Remember that the more impure the lower the melting point.
Where sublimation is used?
It is used to seperate substances of different melting point
What melting point do you reach to become a liquid?
Each substance has a specific melting point (excepting cases of sublimation or thermal degradation).
What happens when a solid is heated and it's temperature rises without melting?
It heats up, until it reaches the melting point or sublimation point of the solid.
