Table of Contents
What will happen if naphthalene is heated?
If heat is then added to naphthalene, it will melt until it reaches 80o C and it will stay at that temperature until melting is complete. This would be the melting point of naphthalene. After melting is complete, the temperature will begin to rise again until it reaches 218o C.
At what temperature does naphthalene evaporate?
ICSC 0667 – NAPHTHALENE. Combustible. Above 80°C explosive vapour/air mixtures may be formed.
What is the toxicity of naphthalene?
Acute (short- term) exposure of humans to naphthalene by inhalation, ingestion, and dermal contact is associated with hemolytic anemia, damage to the liver, and neurological damage. Cataracts have also been reported in workers acutely exposed to naphthalene by inhalation and ingestion.
Can naphthalene combust?
Naphthalene is a COMBUSTIBLE SOLID. It may also be transported in a “molten” or heated form. The vapor given off when Naphthalene is heated is FLAMMABLE and a DANGEROUS FIRE HAZARD.
At what temperature does naphthalene solidify?
about 80°C.
Solid naphthalene sublimes at standard atmospheric temperature at about 80°C. Naphthalene vapours will solidify on cool surfaces form needle-like crystals.
Is naphthalene toxic to humans?
Inhalation of naphthalene may cause skin and eye irritation; gastrointestinal symptoms, such as nausea, vomiting, abdominal cramps, and diarrhea; neurologic symptoms, such as confusion, excitement, and convulsions; renal problems, such as acute renal shutdown; and hematologic features, such as icterus and severe anemia …
What is the latent heat of fusion of naphthalene?
19.0 KJ mol^
Given that the latent heat of fusion of naphthalene is `19.0 KJ mol^(-1)` and its melting point is.
What is the heat of sublimation of naphthalene?
The standard enthalpy of sublimation of naphthalene has been determined calorimetrically at 298.15 K. The value obtained, (73.00 ± 0.25) kJ mol−1 is in agreement with the accepted value derived from vapour pressure measurements.
Why is naphthalene not heated directly?
Answer: This is to avoid naphthalene’s direct heat, which can produce a deadly and combustible vapour gas. Explanation: When heated at 80 °C temperature it rapidly sublimes directly from a solid into a gas, eventually leaving nothing remaining in the crucible.
How do you test for naphthalene?
Place a few crystals of the mothball product in a glass tube or other small container: Add a few drops of chloroform (spectrograde) and a small amount of aluminum chloride anhydrous powder. Naphthalene produces an intense blue color immediately.
How harmful are mothball fumes?
Moth balls contain a toxic chemical, either naphthalene or paradichlorobenzene. Both become a gas when exposed to air and cause that pungent moth ball smell. These gases are irritating to the eyes and lungs and may cause headache, dizziness and nausea. They are both suspected of causing cancer.
Are mothball fumes toxic?
The chemicals in mothballs are toxic to humans and pets. People are exposed to the chemicals in mothballs by inhaling the fumes. If you smell mothballs, you are being exposed to these chemicals. Children or pets sometimes mistake mothballs for food or candy and eat them, which can cause serious effects.
What is the heat of formation of naphthalene?
Enthalpy of formation of solid at standard conditions (nominally 273.15 K, 1 atm.)
| ΔfH°solid (kJ/mol) | 77. ± 10. |
| Method | AVG |
| Reference | N/A |
| Comment | |
|---|---|
| Average of 7 values; Individual data points |
What happens to the temperature of naphthalene during melting?
Answer and Explanation: When naphthalene reaches its melting temperature just as the solid begins to melt, it will stay at that temperature until all the solid has melted…
Why is naphthalene temperature constant?
Naphthalene exists in both solid and liquid states. The temperature remains constant because the heat that supplied to naphthalene is used to overcome the forces of attraction that hold the particles together. The constant temperature is called the melting point.
How long does naphthalene take to evaporate?
At hazardous waste sites and landfills, naphthalene can dissolve in water, attach to soil, and leach into underground drinking water. Some naphthalene dissolves in rivers, lakes, or wells and evaporates within two weeks.
Are mothballs a carcinogen?
Chemical compounds in household products like mothballs and air fresheners can cause cancer by blocking the normal process of “cell suicide” in living organisms, according to a new study spearheaded by the University of Colorado at Boulder.
What is naphthalene poisoning?
Naphthalene is a widely used industrial and household chemical in the form of mothballs. But it has rarely been an agent of poisoning worldwide. We describe a case of ingestional naphthalene poisoning with a good outcome after proper management.
Why is ascorbic acid used in the treatment of naphthalene toxicity?
Studies have demonstrated that toxic manifestations of naphthalene may be due to enhanced production of free oxygen radicals, resulting in lipid peroxidation and deoxyribonucleic acid damage [4]. Ascorbic acid acts as a free radical scavenger and hence may be useful in this situation [5]. [Table/Fig-2]: Systemic effects of naphthalene exposure [3]
What is the enthalpy of combustion of solid at standard conditions?
Go To: Top, Enthalpy of combustion of solid at standard conditions (nominally 298.15 K, 1 atm.), Notes Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A.