Module Eleven Lesson One Assignment

pdf

School

Apex College *

*We aren’t endorsed by this school

Course

101

Subject

Chemistry

Date

Nov 24, 2024

Type

pdf

Pages

Uploaded by HighnessElectron9024

Discussion Questions: - Can you explain why you feel warm when you are standing away from a campfire? - The reason why you feel warm when standing away from a campfire is because of heat transfer. The type of heat transfer is radiation. Infrared waves, which are a type of thermal radiation, are emitted by the campfire. The waves will travel through the air till reaching my body and when it reaches me they will be absorbed. This will cause the molecules on me (like my skin and even clothes ) to increase kinetic energy. They will begin to more and start to give off a warming sensation. Due to their being a temp difference between my body and the fire (me being colder) the is going to be a heat transfer. The heat will travel from the high temps of the fire to my body's low temp. That is why I will feel warm when I am standing far from the campfire. 2. Why does a carpeted floor feel warmer to bare feet than tile or wood even though all surfaces are the same temperature? - A carpeted floor will feel warmer to bare feet than tile or wood flooring because of there are differences in thermal conductivity. The carpet will have lower thermal conductivity, and which means that it will not be that efficient in conducting heat away from my feet. This will cause the carpet to feel a lot warmer because my body heat remains close to my feet( body heat stays trapped near mu feet). Causing it to feel warm. While tile and wood flooring will feel colder because they have a high thermal conductivity. This causes the tile and wood to feel colder in comparison to the carpet because they can quickly absorb and conduct away the heat from your feet. 3. What information would you need to predict whether heat transfer would occur when two objects or materials interact? - I would need to know the temperature( the initial temps of both objects) because heat transfer will only occur from high temps to low temperatures. I will also need to know the thermal conductivity of each of the materials to know if heat transfer will occur. The reason why is that when a material has high conductivity can transfer heat better than low. I also what to know the duration of the interaction between the 2 materials. If the time was short, there might not be enough time for there to be a heat transfer between the 2 objects

What would happen if a person who is wearing a heavy winter jacket were to place a thermometer inside the jacket next to his or her skin? What would happen if we took the same jacket, after it had been hanging in a closet, and placed a thermometer inside? - If someone were to place a thermometer inside the heavy winter jacket next to their skin, both the environment inside the jacket and the person's skin temperature would be recorded by the thermometer. As a result of the jacket's insulation, traps body heat. It would be warmer than the outside temperature of the jacket. The same jacket would measure the temperature inside the closet rather than the individual's body temperature if a thermometer were placed inside it after it had been hanging in the closet. The jacket would have adjusted to the closet's surroundings while it was there, and the thermometer would reflect that temperature. When not next to the subject's skin, it would not be able to measure body heat.

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