Episode I ATTACK OF THE GAS
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Transcript of Episode I ATTACK OF THE GAS
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Not so long ago, in a chemistry lab far far away…May the FORCE/area be with you
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Gas Laws: IntroductionAt the conclusion of our time together, you should be able to:
1. List 5 properties of gases2. Identify the various parts of the kinetic
molecular theory3. Define pressure4. Convert pressure into 3 different units5. Define temperature6. Convert a temperature to Kelvin
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Red-Neck Innovations:
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Importance of Gases
Airbags fill with N2 gas in an accident.
Gas is generated by the decomposition of sodium azide, NaN3.
2 NaN3 ---> 2 Na + 3
N2
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THREE STATES OF MATTER
Fixed Sliding Random
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General Properties of Gases
There is a lot of “free” space in a gas.
Gases can be expanded infinitely.
Gases fill containers uniformly and completely.
Gases diffuse and mix rapidly.
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To Review
Gases expand to fill their containers
Gases are fluid – they flow Gases have low density
1/1000 the density of the equivalent liquid or solid
Gases are compressible Gases effuse and diffuse
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Most Caring Person!!
An eye witness account from New York City on a cold day in December. Some years ago a little boy, about 10-years-old, was standing before a shoe store on the roadway, barefooted, peering through the window, and shivering with cold.A lady approached the young boy and said, "My, but you're in such deep thought staring in that window!“"I was asking God to give me a pair of shoes,“ was the boy's reply.
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Most Caring Person!!The lady took him by the hand, went into the store, and asked the clerk to get half a dozen pairs of socks for the boy. She then asked if he could give her a basin of water and a towel. He quickly brought them to her.She took the little fellow to the back part of the store and, removing her gloves, knelt down, washed his little feet, and dried them with the towel. By this time, the clerk had returned with the socks. Placing a pair upon the boy's feet, she purchased him a pair of shoes.
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Most Caring Person!!
She tied up the remaining pairs of socks and gave them to him. She patted him on the head and said, "No doubt, you will be more comfortable now.“As she turned to go, the astonished kid caught her by the hand, and looking up into her face, and with tears in his eyes, asked her.
"Are you God's wife?"
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Properties of GasesGas properties can be
modeled using math. This model depends on —
V = volume of the gas (L) T = temperature (K)
› ALL temperatures in the entire unit MUST be in Kelvin!!! No Exceptions!
P = pressure (atmospheres)
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Ideal GasesIdeal gases are imaginary gases that perfectly fit all of the assumptions of the kinetic molecular theory. Gases consist of tiny particles that
are far apart relative to their size. Collisions between gas particles and between particles and the walls of the container are elastic collisions
No kinetic energy is lost in elastic collisions
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Ideal Gases (continued)
Gas particles are in constant, rapid motion. They therefore possess kinetic energy, the energy of motion
There are no forces of attraction between gas particles
The average kinetic energy of gas particles
depends on temperature, not on the identity of the particle.
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Bill Gates' RulesHere is a list of 11 things that many high
school and college graduates did not learn in school. In his book, Bill Gates talks about how feel-good, politically-
correct teachings created a full generation of kids with no concept of reality and how this concept has set them up for failure in the real world.
RULE 2 The world won't care about your self-esteem. The
world will expect you to accomplish something BEFORE you feel good about yourself.
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Pressure
Is caused by the collisions of molecules with the walls of a container
Is equal to force/unit area SI units = Newton/meter2 = 1 Pascal (Pa) 1 atmosphere = 101,325 Pa 1 atmosphere = 1 atm = 760 mm Hg = 760
torr1 atm = 29.92 in Hg = 14.7 psi = 0.987 bar
= 10 m column of water.
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Measuring Pressure
The first device for measuring atmospheric pressure was developed by Evangelista Torricelli during the 17th century.The device was called a “barometer”
Baro = weight Meter = measure
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An Early Barometer
The normal pressure due to the atmosphere at sea level can support a column of mercury that is 760 mm high.
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PressureColumn height measures
Pressure of atmosphere
1 standard atmosphere (atm) *
= 760 mm Hg (or torr) *= 29.92 inches Hg *= 14.7 pounds/in2 (psi)= 101.325 kPa
(SI unit is PASCAL)
= about 34 feet of water!
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And now, we pause for this commercial message from STP
OK, so it’s really not THIS kind of STP…
STP in chemistry stands for Standard Temperature and Pressure
Standard Pressure = 1 atm (or an equivalent)
Standard Temperature = 0 deg C (273 K)
STP allows us to compare amounts of gases between
different pressures and temperatures
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Let’s Review:Standard Temperature and
Pressure“STP”
P = 1 atmosphere, 760 torr T = 0°C, 273 Kelvins
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15 Helpful Hints On The Lab Report from
Mr. T’s Vast Lab Experience!!!
Hint #1. When you don't know what you are doing, do it neatly.
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Pressure Conversions
A. What is 475 mm Hg expressed in atm?
B. The pressure of a tire is measured as 29.4 psi.
What is this pressure in mm Hg? = 1.52 x 103 mm Hg
= 0.625 atm475 mm Hg x
29.4 psi x
1 atm760 mm Hg
760 mm Hg 14.7 psi
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101.325 kPa 14.7 psi
Pressure Conversions – Your Turn
A. What is 2.00 atm expressed in torr?
B. The pressure of a tire is measured as 32.0 psi.
What is this pressure in kPa?
= 1520 torr2.00 atm x 760 torr 1 atm
= 221 kPa32.0 psi x
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Temperature
A measure of molecular vibration in an object.
SI Unit: the Kelvin ( K )
Note: not a degree Absolute Zero = 0 K
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Converting Temperature
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3 Temperature Scales Fahrenheit Celsius Kelvin
Anders Celsius1701-1744
Lord Kelvin(William Thomson)1824-1907
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Familiar Saying
A beholden vessel never exceeds 212 degrees Fahrenheit.
A watched pot never boils!
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Fahrenheit, Celsius, and Kelvin Temperature Scales.
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3 Temperature Scales
Notice that 1 Kelvin = 1 degree Celsius
Boiling point of water
Freezing point of water
Celsius
100 ˚C
0 ˚C
100˚C
Kelvin
373 K
273 K
100 K
Fahrenheit
32 ˚F
212 ˚F
180˚F
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Celsius and Kelvin
K= oC + 273
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Calculations Using Temperature
Generally require temp’s in Kelvins
T (K) = t (˚C) + 273.15
Body temp = 37 ˚C + 273 = 310 K
Liquid nitrogen = -196 ˚C + 273 = 77 K
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Calvin’s Thoughts on Lunch:
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Summary: Converting Celsius to Kelvin
Gas law problems involving temperature require that the temperature be in KELVINS!
Kelvins = °C + 273
°C = Kelvins - 273
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Gas Laws: IntroductionLet’s see if you can:
1. List 5 properties of gases2. Identify the various parts of the kinetic
molecular theory3. Define pressure4. Convert any kind of pressure to
atmospheres5. Define temperature6. Convert a temperature to Kelvin
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The End!!!