1. Intentions for success:
We will be successful when we can describe the behavior of gasses.
Sept. 4, 2018
Vocab: Pressure, Absolute zero, Charles’s law, Boyle’s Law
Warm up: I have a soda in a plastic bottle. What factors affect the pressure?

2. Ch. 8 - Solids, Liquids, & Gases
MATTER
Ch. 8 - Solids, Liquids, & Gases
III. Behavior of Gases (p.75-81)
Pressure
Boyle’s Law
Charles’ Law

3. A. Pressure
Which shoes create the most pressure?

4. A. Pressure Key Units at Sea Level 101.325 kPa (kilopascal) 1 atm
760 mm Hg
14.7 psi

5. A. Pressure Barometer Manometer Atmospheric Pressure
Contained Pressure

6. A. Pressure Effect on Boiling Point
When atmospheric pressure increases, the boiling point of a liquid increases.
EX: high altitude cooking, boiling cold water

7. B. Boyle’s Law
When the volume of a gas decreases, its pressure increases (at constant temp).
Pressure and Volume are inversely proportional
PV = k P V
INVERSE

8. B. Boyle’s Law
Boyles Law animation
Demonstration

9. P1V1 = P2V2 B. Boyle’s Law INVERSE
A sample of gas has a volume of 12.0 L and a pressure of 1.00 atm. If the pressure of gas is increased to 2.00 atm, what is the new volume of the gas? P V
INVERSE

10. C. Charles’ Law
When the temperature of a gas increases, its volume also increases (at constant pressure).
Volume and Temperature are directly proportional. V T
DIRECT

11. C. Charles’ Law Volume and Temperature are directly proportional.
Temperature must be in Kelvins in order for this to be directly proportional
Celsius to Kelvin conversion factor
T(K) = T(C) + 273

12. C. Charles’ Law
Charles Law Demo

13. C. Charles’ Law
V1/T1 = V2/T2
On hot days, you may have noticed that potato chip bags seem to “inflate”, even though they have not been opened. If I have a 250 mL bag at a temperature of 19 0C, and I leave it in my car which has a temperature of C, what will the new volume of the bag be?

14. C. Charles’ Law -273°C or 0 K Absolute Zero - Temp at which...
the volume of a gas would equal zero.
all particle motion would stop.
-273°C or
0 K

15. B. Gas Law Video
Boyles Law animation

16. Boyle’s Law Practice
To compress nitrogen at 1 atm from 750 mL to 500 mL, what must the new pressure be if the temperature is kept constant?
What would be the new volume if the pressure on 600 mL is increased from 90 kPa to 150 kPa?

17. Boyle’s Law Practice
A student collects 25 mL of gas at 96 kPa. What volume would this gas occupy at kPa. There is no change in temperature or mass.
A gas measuring 525 mL is collected at kPa. What volume does this gas occupy at kPa?

18. Charles’s Law Practice
The temperature inside my refrigerator is about 4.00 Celsius. If I place a balloon in my fridge that initially has a temperature of 220 C and a volume of 0.50 liters, what will be the volume of the balloon when it is fully cooled by my refrigerator?

19. Charles’s Law Practice
Some students believe that teachers are full of hot air. If I inhale 2.2 liters of gas at a temperature of 180 C and it heats to a temperature of 380 C in my lungs, what is the new volume of the gas?
Continue completing the Gas Law Handout