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Naphthalene undergoes a unique phase change called sublimation, where it changes directly from a solid to a gas without passing through the liquid phase. This property makes naphthalene useful for applications such as mothball production and as a sublimation dye in the laboratory.
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Explain why naphthalene or moth balls disappear without wetting the clothes?
Naphthalene (moth balls) sublimes, which means it transitions from a solid to a gas without going through a liquid phase. This process occurs due to the substance's high vapor pressure at room temperature, causing it to evaporate directly into the air. As a result, naphthalene can disappear from clothes without leaving any visible residue.
Does naphthalene decompose when gently heated?
Yes, naphthalene sublimes and undergoes vaporization at temperatures above 80 degrees Celsius rather than decomposing directly. At temperatures exceeding its sublimation point, naphthalene converts from a solid to a gas without passing through a liquid phase.
Why naphthalene undergoes sublimation but has melting point?
Naphthalene undergoes sublimation because it has weak intermolecular forces that allow it to transition directly from solid to gas phase without melting first. However, naphthalene can still have a melting point due to the presence of a crystal lattice structure that requires enough energy to break to form a liquid.
What characteristics do sublimation have?
Sublimation is a phase transition where a substance goes directly from a solid to a gas without passing through the liquid phase. It occurs under specific temperature and pressure conditions, and is a reversible process. Sublimation is commonly observed in substances like dry ice (solid carbon dioxide) and mothballs (naphthalene).
What is the phase change in a boiling point?
What is the phase change in evaporation
What does a Graph of melting point and freezing point of naphthalene look like?
The graph of the melting point and freezing point of naphthalene would show a plateau at the melting point, as the solid naphthalene transitions into the liquid phase, and a plateau at the freezing point, as the liquid naphthalene transitions back into the solid phase. The melting point and freezing point of naphthalene are the same at approximately 80 degrees Celsius.
What happens to naphthalene when it sublimes?
When naphthalene sublimes, it transitions directly from a solid to a gas phase without passing through a liquid phase. This process occurs when the substance is heated and the vapor pressure exceeds the atmospheric pressure. As the naphthalene molecules gain enough energy to break free from the solid phase, they transform into a gas.
How do naphthalene balls become smaller. name the process?
Naphthalene balls decrease in size due to sublimation, a process where the solid naphthalene directly transitions into a gas without passing through the liquid phase. This gradual transition causes the naphthalene balls to shrink over time.
Explain why naphthalene or moth balls disappear without wetting the clothes?
Naphthalene (moth balls) sublimes, which means it transitions from a solid to a gas without going through a liquid phase. This process occurs due to the substance's high vapor pressure at room temperature, causing it to evaporate directly into the air. As a result, naphthalene can disappear from clothes without leaving any visible residue.
Does naphthalene decompose when gently heated?
Yes, naphthalene sublimes and undergoes vaporization at temperatures above 80 degrees Celsius rather than decomposing directly. At temperatures exceeding its sublimation point, naphthalene converts from a solid to a gas without passing through a liquid phase.
What happens to the solid particles of naphthalene when heated?
When naphthalene is heated, the solid particles sublimate, meaning they change directly from a solid to a gas without passing through a liquid phase. This sublimation process causes the naphthalene to vaporize and release a characteristic odor.
Which physical method can be used to separate naphthalene from sand?
Sublimation can be used to separate naphthalene from sand. Naphthalene can be heated to change it directly from a solid to a gas, leaving the sand behind. The gas can then be collected and cooled to form solid naphthalene again.
How can you separate a mixture of naphthalene and ammonium chloride?
To separate a mixture of naphthalene and ammonium chloride, you can use sublimation. This involves heating the mixture, causing the naphthalene to sublime (change from a solid to a gas) and leaving the ammonium chloride behind. The naphthalene gas can then be collected and cooled to form solid naphthalene again.
Why naphthalene undergoes sublimation but has melting point?
Naphthalene undergoes sublimation because it has weak intermolecular forces that allow it to transition directly from solid to gas phase without melting first. However, naphthalene can still have a melting point due to the presence of a crystal lattice structure that requires enough energy to break to form a liquid.
Why is solid naphthalene not heated directly with a Bunsen burner?
Solid naphthalene is not heated directly with a Bunsen burner because it can undergo sublimation, meaning it can turn directly from a solid to a gas without passing through the liquid phase. This process can lead to the rapid vaporization and combustion of naphthalene, increasing the risk of fire or explosion.
What characteristics do sublimation have?
Sublimation is a phase transition where a substance goes directly from a solid to a gas without passing through the liquid phase. It occurs under specific temperature and pressure conditions, and is a reversible process. Sublimation is commonly observed in substances like dry ice (solid carbon dioxide) and mothballs (naphthalene).
Phase change from a solid to a gas?
Sublimation is the phase change when a solid transitions directly into a gas without passing through the liquid phase. This process occurs when the temperature and pressure conditions allow the solid particles to have enough energy to break free from their fixed positions and move into the gas phase. Examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (naphthalene).
