Reference text: 14.1 page 413-417
 Solid
 Liquid
 Gas
 Which has a specific volume?
 Which has a specific shape?
 Compressibility – how much the volume of
matter decreases under pressure
 A gas can be squeezed into a small space
See ...
 Pressure is the force the gas molecules exert
on the container as they collide with it
 Four variables to describe a ga...
 When you pump air into a container, you
 increase the amount of gas inside the tire,
 which increases the number of co...
Fewer gas particles,
lower pressure
More gas particles, higher
pressure
 In a sealed container, gases move from an
area of high pressure to low pressure
 If the volume of a container is reduced, the
pressure will increase
 If the volume of a container is increased, the
pressure will decrease
 Relationship is inverse
 If the volume is doubl...
 If the temperature is increased, the particles
will move faster,
 Which causes more collisions between particles
 Whic...
 Increasing the temperature causes the
pressure to increase
 Decreasing the temperature will cause the pressure to
decrease
 Relationship is direct
 As the temperature is doubled,...
1. Why is a gas easy to compress?
2. List three factors that can affect gas pressure.
3. Why does a collision with an air ...
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Introduction to gases

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Introduction to gases

  1. 1. Reference text: 14.1 page 413-417
  2. 2.  Solid  Liquid  Gas  Which has a specific volume?  Which has a specific shape?
  3. 3.  Compressibility – how much the volume of matter decreases under pressure  A gas can be squeezed into a small space See the all the space between the gas particles? The particles can be squeezed closer together under pressure
  4. 4.  Pressure is the force the gas molecules exert on the container as they collide with it  Four variables to describe a gas:  Pressure (P): measured in kilopascals (kPa)  Volume (V): measured in liters (L)  Temperature (T): measured in kelvins (K)  Amount (n): measured in number of moles
  5. 5.  When you pump air into a container, you  increase the amount of gas inside the tire,  which increases the number of collisions between gas particles,  which increases the pressure  Relationship is direct:  If you double the amount of gas, the pressure will double
  6. 6. Fewer gas particles, lower pressure More gas particles, higher pressure
  7. 7.  In a sealed container, gases move from an area of high pressure to low pressure
  8. 8.  If the volume of a container is reduced, the pressure will increase
  9. 9.  If the volume of a container is increased, the pressure will decrease  Relationship is inverse  If the volume is doubled, the pressure will decrease by half
  10. 10.  If the temperature is increased, the particles will move faster,  Which causes more collisions between particles  Which increases the pressure
  11. 11.  Increasing the temperature causes the pressure to increase
  12. 12.  Decreasing the temperature will cause the pressure to decrease  Relationship is direct  As the temperature is doubled, the pressure is doubled  As the temperature is decreased by half, the pressure will decrease by half
  13. 13. 1. Why is a gas easy to compress? 2. List three factors that can affect gas pressure. 3. Why does a collision with an air bag cause less damage than a collision with a steering wheel? (extra help) 4. How does a decrease in temperature affect the pressure of a contained gas? 5. If the temperature is constant, what change in volume would cause the pressure of an enclosed gas to be reduced to one quarter of its original volume? 6. What happens to particle motion as the temperature increases? What if it decreases? 7. Write a paragraph explaining how the compressed gas in an aerosol can force paint out of the can. Describe how the gas pressure inside the can changes as the paint is sprayed, and identify the variable that causes this change. Refer to figure 14.5 in the text.

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