Physics & Chemistry: Pressure & Force Exam Prep

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SUMMARY

This discussion focuses on understanding the behavior of gases under varying conditions, specifically regarding partial pressures and the effects of temperature changes. The scenario involves a 1 cubic meter container filled with equal molar quantities of helium (He), oxygen (O2), carbon dioxide (CO2), and nitrogen (N2) at a pressure of 1 atm (10^5 Pa) and a temperature of 25 degrees Celsius. It is established that the partial pressures of ideal gases increase uniformly with temperature, independent of the size of the gas molecules. Additionally, the discussion touches on the relationship between FM radio waves and their associated magnetic fields, confirming that the magnetic field is perpendicular to the direction of the radio wave.

PREREQUISITES
  • Understanding of ideal gas laws and partial pressures
  • Basic knowledge of thermodynamics, particularly the relationship between temperature and pressure
  • Familiarity with electromagnetic waves, specifically FM radio waves
  • Concept of molecular size and its relevance in gas behavior
NEXT STEPS
  • Study the Ideal Gas Law and its applications in real-world scenarios
  • Learn about the principles of thermodynamics, focusing on the relationship between temperature and pressure
  • Research electromagnetic wave properties, particularly the characteristics of FM radio waves
  • Explore the concept of partial pressures in mixtures of gases and their implications in various scientific fields
USEFUL FOR

This discussion is beneficial for students preparing for physics and chemistry exams, particularly those focusing on gas laws and electromagnetic theory. It is also useful for educators and anyone interested in the practical applications of these scientific principles.

itsascience
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Hello, I am studying for an exam that I am taking in January, and I am doing practice problems. I have not taken physics in over 2.5 years... and I don't remember half of it pretty much. I'm trying to learn it again as I practice.

Homework Statement


Here is the problem:
There is a 1 cubic meter container filled with 4 gases: He, O2, CO2, N2. There are equal molar quantities of all 4 gases, and are assumed to be ideal. The pressure inside is 1 atm, or 10^5 Pa. The temperature is 25 degrees C.
What I want to know is, does the partial pressure of each gas increase at different rates? Or does the partial pressure of the gases increase at the same rate... If they are different, does it depend on the size of the gas molecule?
Actually, I'm not sure if this should be in physics section or in the chemistry section.


Homework Equations



Honestly I don't even know.

The Attempt at a Solution



I tried reading about partial pressures, but could not find anything relevant :/
 
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What do you mean by "pressure increase rate"? What force is behind this pressure increase?

I suppose you mean something like "do all partial pressures go up at the same time if we heat the mixture?" If so the answer is yes, each gas behaves ideally independent of what other gases do.
 
Thank you Borek!
Yes that is what I meant.
The temperature was increased from 25C to 50C.

---

Now I'm up to a problem that deals with FM radio waves and the magnetic field generated by the waves... :/
I have to relate the direction of the magnetic field that accompanies the FM signal. I definitely did not learn this in my physics courses.
I know that FM radiowaves are electromagnetic, they have a certain frequency and an amplitude. But I do not know anything about the magnetic field caused by it... :(

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Ok so I found out that the magnetic field is perpendicular to the radio wave.
 
Last edited:

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