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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.
What else can I help you with?
Is energy added during melting changes?
No, the temperature remains constant during melting as energy is used to break intermolecular bonds rather than increase the temperature.
What happens to temperature if matter is in a change of state?
During a change of state, such as melting or boiling, the temperature generally remains constant. The energy added or removed during the phase change is used to break or form intermolecular forces, rather than changing the kinetic energy of the particles to alter temperature. Once the change of state is complete, the temperature will then either increase or decrease again depending on whether heat is added or removed.
Why does the temperature stay the same during melting?
During melting, the temperature remains constant because the heat energy being absorbed by the substance is being used to break the bonds between the molecules rather than increase the kinetic energy of the molecules. Once all the bonds are broken and the substance changes phase completely, the temperature will start to rise again.
Why does temperature remain constant during melting and boiling?
During melting and boiling, the energy being added to the substance is used to break the intermolecular forces holding the molecules together, rather than increasing the kinetic energy of the molecules. This means that the temperature remains constant because the energy is absorbed as the substance undergoes a phase change.
What happens to the heat energy which is supplied to the solid once it has started melting?
During the phase change of a solid to a liquid (melting), all of the energy goes into breaking the intermolecular bonds holding the molecules of the solid together, and none of the energy goes into changing the temperature. Thus, during this particular phase of melting, the temperature of the system does NOT change.
Why is a water bath used to heat the solid naphthalene?
A water bath is used to heat solid naphthalene to ensure uniform and controlled heating. This method prevents localized overheating that could lead to decomposition or degradation of the naphthalene. Additionally, the temperature of the water bath can be easily regulated, allowing for precise temperature control during the melting process. This results in a more consistent and safe melting of the solid naphthalene.
What happens when the temperature stays the same in a melting curve?
During melting the temperature remain constant if it was achieved the melting point.
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.
If a solid piece of naphthalene is heated and remains at 80 degrees Celsius until it is completely melted you know that 80 degrees Celsius is?
80 degrees Celsius is the melting point of naphthalene. At this temperature, the solid naphthalene transitions to a liquid state, and the temperature remains constant during the phase change until all of the solid has melted. This characteristic indicates that the energy being added to the system is used for breaking intermolecular forces rather than increasing temperature.
What happens to naphthalene when heated?
Naphthalene, which is found in mothballs, when heated sublimes (which means it changes from a solid directly into a gaseous state without going through the liquid state).
If a solid piece of naphthalene is heated and remains at 80C until it is completely melted you know that 80C is the?
If a solid piece of naphthalene is heated and remains at 80°C until it is completely melted, you know that 80°C is the melting point of naphthalene. At this temperature, the solid phase transitions to the liquid phase, absorbing heat without a change in temperature until the entire sample is melted. This characteristic behavior is typical for substances during phase changes, where energy input goes into overcoming intermolecular forces rather than increasing temperature.
If a liquid sample of naphthalene is heated and remains at 218C until it is completely vaporized you know that 218C is the of naphthalene.?
The temperature of 218°C at which the liquid sample of naphthalene remains constant during vaporization indicates its boiling point. At this temperature, the vapor pressure of naphthalene equals the atmospheric pressure, allowing it to transition from a liquid to a gas. Therefore, 218°C is the boiling point of naphthalene under the given conditions.
What happens to the temperature of a solid at its melting point when heated?
The intermolecular forces of attraction in the solid decreases as it is heated and the solid melts (solid converts to liquid) at its melting point.
What happens to the water in the beaker during melting?
During melting, the water in the beaker absorbs heat and undergoes a phase change from solid (ice) to liquid. As it melts, the temperature remains constant until all the ice has transformed into water.
What happens if the annealing temperature is too high during the process?
If the annealing temperature is too high during the process, it can lead to the material becoming too soft or even melting, which can affect the desired properties of the material.
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.
Explain what happens to the temperature of an ice cube as it melts?
Temperature of melting iceis a constant property: it does not change during melting (stays 0oC, this is even one of the the defined value of the Celsius temperature scale)(for any other melting solid the same is valid at each melting point temperature)
