Day Six: Activity Two

Describe some common weather occurrences in relation to the gas laws and characteristics we have been exploring.
On lakes the wind is strong because of the different temperatures.  There is an expansion of molecules because of the heat of the sun.  As the wind goes up the mountains it goes slower because of the cooler temperatures.  Then once it goes down the mountain to the desert it expands as the temperature gets warmer and the molecules will move faster, therefore a stronger wind.

What is the Bernoulli's Principle, provide an example or application of this.

Bernoulli's Principle states that as the velocity of a fluid increases, the pressure exerted by that fluid decreases.  Airplanes get a part of their lift by taking advantage of Bernoulli's principle. Race cars employ Bernoulli's principle to keep their rear wheels on the ground while traveling at high speeds.

http://library.thinkquest.org/27948/bernoulli.html

Day Six

Gases
Far apart-cooling of balloon
Density different- based observations molecular determines weight
Lots of movement- stimulation
Diffusion- bumping into one another

Ideal Gas Law
PV = nRT

P= pressure
V= volume
n= moles of gas
T= temperature
R= gas constant

Balloon
Volume- up (expands)  Direct Relationship Temp- up
Volume- up (expands) Inverse Relationship Pressure- decreased
Volume- up (expends) Direct Relationship Add Molecules- up

PV/nT = nRT/nT = PV/nT= R
P1V1/n1T1 = P2V2/n2T2  (condition 1 and 2)

Question:
P1 = 32 psi
T1 = 90 degrees F

90 degrees F --> 32.2 degrees C--> 305.2 K
-20 degrees F--> 244.3 K

32 psi/305.2 K = ?/244.3 K = 32psi (244.3K)/305.2 K = x psi (305.2 K)/ 305.2 K = 25.6 psi

Day Five Homework

Time	Temperature	Inches
7:30	19 degrees	2.5 inches
8:00	2 degrees	2.6inches
8:30	2 degrees	2.75 inches
9:00	2 degrees	2.75 inches
10:00 + 1 tsp. salt	0 degrees	2.65 inches
10:30 + 1 more tsp. salt Total: 2 tsp. salt	-5 degrees	2.60 inches

We measured out 1 cup of water and then poured it into a clear plastic container.  Then we placed it into the freezer.  Water is the smallest at room temperature.

At 10:00 when we added the salt it melted the ice and turned it into a slushy substance.

At 10:30 when we added more salt the more the ice melted and became more of a slushy material. But when we added more salt the temperature got lower or colder.  We believe the amount of salt does affect the freezing point because according to our results the temperature lowered after we added more salt.

Day Five: Activity Two

Molecular Masses:

CO2: C=12 O=16 12.01 + (16 x 2) = 12 + 32= 44 g/mole

O2: 16 16 x 2= 32 g/mole

He: 4.00 g/mole

H2O: H= 1.00 O= 16 (1.00 x 2) + 16 = 18 g/mole

Day Five

What is burning? Show the chemical formula and an image of the structure.
The wax is burning.  The wick is made out of absorbent twine, this absorbency is important in a candle because the wick needs to absorb liquid wax and move it upward while the candle is burning.  Then the fuel for the wick is the wax of the candle.
Unbalanced Equation: C25H52 + O2 --> CO2 + H2O

Write the chemical reaction.
C25H52 + O2 --> CO2 + H2O

Write the balanced chemical reaction.
C25H52 + 38 O2 --> 25 CO2 + 26 H2O

Homework Day Four

Explain what happened in that mountain village we described in class. You explanation will need to include detail that includes density and molecular weight of gases.

Carbon dioxide was released into the air which then killed the people in the valley.  Sulfur dioxide, carbon dioxide, and hydrogen fluoride are some of the volanic gasses that are given off and are the biggest threat to humans.  Carbon dioxide is a heavy gas and puts out 30% of co2 into the air.  Sulfur dioxide depends on the weather rather than the gas.

Day Four: Activity Five

How much pressure do you place on someone when you stand of them?
186 lbs/12 in^2 = 15.5 lbs/in^2
lbs = 186
in^2 = 12
I would exert 15.5 lbs/ in^2