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# cm2 - The Gas Laws Describe HOW gases behave x Can be...

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The Gas Laws Describe HOW gases behave. Can be predicted by the theory. The Kinetic Theory Amount of change can be calculated with mathematical equations.
The effect of adding gas. When we blow up a balloon we are adding gas molecules. Doubling the number of gas particles doubles the pressure (of the same volume at the same temperature).

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4 4 things In order to completely describe a gas you need to measure 4 things 1. Pressure 2. Temperature 3. Volume 4. Number of particles
Pressure and the number of molecules are directly related More molecules means more collisions Fewer molecules means fewer collisions.

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1 atm If you double the number of molecules
If you double the number of molecules You double the pressure. 2 atm

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As you remove molecules from a container 4 atm
As you remove molecules from a container the pressure decreases 2 atm

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As you remove molecules from a container the pressure decreases Until the pressure inside equals the pressure outside Molecules naturally move from high to low pressure 1 atm
Changing the size of the container In a smaller container molecules have less room to move Hit the sides of the container more often As volume decreases pressure increases.

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1 atm 4 Liters As the pressure on a gas increases
2 atm 2 Liters As the pressure on a gas increases the volume decreases Pressure and volume are inversely related

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Temperature Raising the temperature of a gas increases the pressure if the volume is held constant. The molecules hit the walls harder. The only way to increase the temperature at constant pressure is to increase the volume.
If you start with 1 liter of gas at 1 atm pressure and 300 K and heat it to 600 K one of 2 things happens 300 K

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Either the volume will increase to 2 liters at 1 atm 300 K 600 K
300 K 600 K Or the pressure will increase to 2 atm. Or someplace in between

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Ideal Gases In this chapter we are going to assume the gases behave ideally Does not really exist makes the math easier close approximation. Assume particles have no volume Assume no attractive forces between molecules
Ideal Gases There are no gases for which this is true.

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cm2 - The Gas Laws Describe HOW gases behave x Can be...

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