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Heat and cooling curve of pure water?
The heating curve of pure water shows that as heat is added, the temperature of the water rises until it reaches its boiling point at 100°C, where it starts to vaporize. On the other hand, the cooling curve of water shows that as heat is removed, the temperature decreases until it reaches its freezing point at 0°C, where it solidifies into ice.
Why is the naphthalene solution cooled in an ice bath before vacuum filtration by recrystallization?
Cooling the naphthalene solution in an ice bath helps to promote the formation of pure crystals by reducing the solubility of impurities. When the solution is cooled, the naphthalene crystallizes out, while most impurities remain dissolved in the solution. This improves the efficiency of the vacuum filtration process by ensuring a higher purity product.
How do you make liquid naphthalene?
Liquid naphthalene is typically obtained by melting solid naphthalene. This can be done by heating solid naphthalene to around 80 degrees Celsius until it liquefies. It is important to handle naphthalene with care as it is toxic and flammable.
What is iupac name for compound naphalene?
1,2,3,4-tetrahydronaphthalene.
Does the mixture of naphthalene and chalk powder has the smell of naphthalene?
The smell of naphthalene will likely be present in the mixture, although it may be less intense due to the dilution with chalk powder. The naphthalene odor may be detectable, especially in close proximity to the mixture.
What is the difference between a heating curve and a cooling curve?
heating curve is hotter than the cooling curve
Heat and cooling curve of pure water?
The heating curve of pure water shows that as heat is added, the temperature of the water rises until it reaches its boiling point at 100°C, where it starts to vaporize. On the other hand, the cooling curve of water shows that as heat is removed, the temperature decreases until it reaches its freezing point at 0°C, where it solidifies into ice.
What shape is a Cooling curve graph?
A Cooling curve graph changes shape.
During the cooling of naphthalene explain why the naphthalene must be stirred continuosly?
Stirring the naphthalene continuously during cooling helps to promote even heat distribution and prevent the formation of hot spots. This ensures that the naphthalene cools uniformly, reducing the risk of crystallization issues and improving the overall quality of the solid product.
The supply curve shows the relationship between what?
the supply curve shows the relationship between
What is cooling curve for pure metals?
A cooling curve for pure metals shows the changes in temperature as a molten metal solidifies. It typically consists of a gradual decrease in temperature until the metal solidifies, followed by a period where the temperature remains constant as the latent heat of fusion is released, before the temperature decreases further. The cooling curve can provide important information about the solidification process and the resulting microstructure of the solid metal.
During the cooling of the naphthalene why the boiling tube must be placed in a conical flask?
Placing the boiling tube in a conical flask during the cooling process helps to prevent any naphthalene vapor from escaping into the environment. The conical flask acts as a containment vessel, allowing the naphthalene to condense back into solid form inside the boiling tube, making it easier to collect and handle afterward. Additionally, this setup minimizes any potential hazards associated with inhaling the vapors.
What curve shows the relationship between temperature and time?
A temperature vs. time curve is often represented by a heating or cooling curve. During heating, temperature increases over time at a steady rate until reaching a plateau where a substance changes state. During cooling, temperature decreases over time at a steady rate until reaching another plateau at the substance's freezing or melting point.
How does surface area affect the cooling curve?
put it in the fridge
what is the dependent variable in heating and cooling curve water?
it must be an atom
Why must each point have a curve in a cooling graph?
In a cooling graph, each point represents a specific temperature measurement over time. The curve connecting these points helps to illustrate the rate at which the temperature is changing, showing how quickly or slowly the object is cooling down. The curve also accounts for any fluctuations in the cooling process, providing a more accurate depiction of the overall cooling trend.
What curve shows the relationship between the sales price and quantity is called the demand curve?
supply
