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What phase is naphthalene at room temperature?
At room temperature, naphthalene is typically in a solid phase. It has a melting point of about 80 degrees Celsius (176 degrees Fahrenheit), so at temperatures below this, it remains solid. When heated above its melting point, naphthalene will transition into a liquid phase.
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.
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.
How can we purified naphthalene by sublimation?
Naphthalene can be purified by sublimation due to its ability to transition directly from solid to gas without passing through a liquid phase. To perform the sublimation, heat the impure naphthalene in a controlled manner, allowing it to vaporize. The vapor then condenses on a cooler surface, typically a cold glass or metal surface, forming pure naphthalene crystals. This method effectively separates naphthalene from non-volatile impurities that do not sublimate.
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 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.
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.
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.
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.
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.
How can you separate a mixture of naphthalene and ammonium chloride?
One way is to slurry the solid mixture with water. The ammonium chloride will dissolve and the naphthalene will not. Ammonium chloride can then be recovered by evaporating the water solution of it that is formed.
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.
If a solid piece of naphthalene is heated and remains at 80 and degC until it is completely melted you know that 80 and ordmC is the?
The temperature of 80 °C is the melting point of naphthalene. At this temperature, solid naphthalene transitions to its liquid form, and the system remains at this temperature until all the solid has melted. This characteristic temperature indicates the point at which the phase change occurs, and any heat added during this time is used to break the intermolecular forces rather than increase the temperature.
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).
