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Gas Laws. Background  The gas laws treat gases as ideal  In ideal gases, each molecule has no volume and there is no attraction between molecules.

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Presentation on theme: "Gas Laws. Background  The gas laws treat gases as ideal  In ideal gases, each molecule has no volume and there is no attraction between molecules."— Presentation transcript:

1 Gas Laws

2 Background  The gas laws treat gases as ideal  In ideal gases, each molecule has no volume and there is no attraction between molecules.

3 Pressure  The Earth’s air is called atmosphere.  This air exerts a force called pressure.  Pressure is the amount of force exerted per unit of area.  P=F/A  Pressure is measured in Pascal (Pa).  1 Pa is a force of one N/ sq. meter.  At sea level, atm. pressure is 101.3kPa

4 Atmosphere  The atmosphere from the Earth’s surface to 16Km is called the troposphere.  Gases that are in this area are- nitrogen, oxygen, argon, carbon dioxide, and water vapor.  Colliding particles create air pressure in every square meter of the troposphere.

5 Factors Affecting Gas Pressure  Amount of gas  Give an example of how this factor affects pressure and draw it  Volume  Give an example of how this factor affects pressure and draw it  Temperature  Give an example of how this factor affects pressure and draw it

6 Boyle’s Law  Decrease volume, the pressure increases.  No temperature change.  Make a space smaller but still contains the same amount the particles hit walls more and faster.  Particles don’t have as far to go.  P 1 X V 1 = P 2 x V 2

7 Drawing of Law  Draw an example of this law in action.  Use at least four colors.  Draw on a left page

8 Charles Law  Volume increases as temperature increases.  No pressure change.  More energy: faster and more movement.  Causing the walls of the container to be forced out if they are moveable.  Charles's calculated the temperature which a gas would have no volume.  Temperature is –273 o C absolute zero. Lord Kelvin.

9 Charles’s Law  V 1 / T 1 = V 2 /T 2  Always convert temperature to Kelvin  The degrees of Celsius is added to 273 to find Kelvin

10 Drawing of Law  Draw an example of this law in action.  Use at least four colors.  Draw on a left page

11 Boyle’s Law vs. Charles Law  Boyles Law  When under pressure, a person may be near the boiling point.  Relates pressure to Boyle.  Charles Law  Remember that the letter “C” is in both Celsius and Charles.  This law has to do with temperature.

12 Gay-Lussac’s Law  P 1 /T 1 = P 2 / T 2  Pressure is directly related to Temperature  Volume is constant

13 Drawing of Law  Draw an example of this law in action.  Use at least four colors.  Draw on a left page

14 Combined Gas Law  Try to remember all the laws and their equations is difficult so if you put them together then you get Combined gas law.  P 1 x V 1 = P 2 x V 2 T 1 T 2

15 Animation  Gas AnimationGas Animation

16 Practice Problems  Pg. 335  Show your work for problems 10 and 11  Practice Problems pg. 337  Show your work for problems 12 and 13  Practice Problems pg.338  Show work for problem14 and 15  Practice Problem pg. 340  Show work for 16 and 17

17 Ideal Gas Law  P x V = n x R x T  R is a constant 8.31  n is moles


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