Molar Heat of Fusion of Ice Experiment.
Does the Temperature of a component of a system [cup of warm water from experiemtn] depend on the quanity of matter in the sample?
two different ways to increase the temperature of a pan of cold water??? Does the temeperature change of a system depend on the method used to transfer energy to it???
Why warm up the water above room temeperature before adding ice? What error would it have caused and what direction would it shift my anwser?
TY
I will be happy to critique your thinking on this.
well for the anwsers I put so far.
1. No because you can have 500ml of water at 5 degrees and have 10,000ml at 5 degrees also.
2. I'm actually not sure what they want me to anwser so I put. Conduction since hotter travels to colder until the temperature is the same. Another would be radiation? But they said pan so I'm thinking about cooking but not sure.
3.I guess the water is warmed up because the cooler temperatures would travel into the cup and verse versa.
To determine the molar heat of fusion of ice, you conduct an experiment involving a cup of warm water and ice. Let's answer your questions step by step:
1. Does the temperature of a component of a system (cup of warm water) depend on the quantity of matter in the sample?
The temperature of a component of a system, such as the cup of warm water, generally does not depend on the quantity of matter in the sample. The temperature measurement is based on the average kinetic energy of the particles within the system, so as long as the sample is well-mixed, the temperature will remain the same regardless of the quantity of matter.
2. Two different ways to increase the temperature of a pan of cold water:
i) Apply a heat source: One way to increase the temperature of the cold water is to provide heat energy to the system, such as using a stovetop or a Bunsen burner. By transferring heat to the water, the kinetic energy of the water molecules increases, raising the overall temperature.
ii) Mix with a hot liquid: Another way to increase the temperature of the cold water is to mix it with a hot liquid. By adding hot water, for example, the thermal energy of the hot water is transferred to the cold water, increasing its temperature.
3. Does the temperature change of a system depend on the method used to transfer energy to it?
The temperature change of a system generally does not depend on the method used to transfer energy to it. As long as the same amount of energy is transferred to the system, regardless of the method (heat source, mixing with hot liquid, etc.), the temperature change will be the same. The principle of energy conservation ensures that the increase in thermal energy will be reflected as a temperature change in the system.
4. Why warm up the water above room temperature before adding ice? What error would it cause, and how would it shift the answer?
In the molar heat of fusion experiment, warming up the water above room temperature before adding ice serves two purposes:
i) It ensures that the water is initially at a temperature higher than its freezing point, guaranteeing that the ice will melt completely upon contact. This ensures you have a known starting temperature for the reaction.
ii) It compensates for heat loss during the experiment. As the ice melts, it absorbs heat from the system, leading to a decrease in temperature. By starting with warm water, you have a buffer to account for this heat loss.
If you were to skip the step of warming up the water above room temperature, the ice would cause a more significant drop in temperature since the starting temperature would be closer to the ice's freezing point. This error would result in a higher calculated heat of fusion value, as the temperature change would appear greater due to the lower starting temperature. Warming the water above room temperature helps mitigate this error and provides more accurate results.