Evaporates and Intermolecular Attractions Lab

The purpose of this lab was to observe evaporation and temperature decreases. For this lab, two temperature probes were linked to the computer and an app to measure the temperatures those probes are facing. A filter piece of paper was cut into two strips and tied onto the ends of the probes with rubber bands. Next, the probes were placed into 6 solutions to measure temperature differences. The results are as follows...

Substance	Formula	Molecular Weight	Hydrogen Bond (Yes or No)
Ethanol	C2 H5 OH	46g	Yes
1-propanol	C3 H7 OH	60g	Yes
1-butanol	C4 H9 OH	74g	Yes
n-pentane	C5 H12	72g	No
Methanol	C H3 OH	32g	Yes
n-hexane	C6 H14	86g	No

Substance	T2 (degrees C)	T1 (Degrees C)	T2-T1 (Degrees C)
Methanol	3.32	22.5	19.18
Ethanol	8.59	23.5	14.91
1-propanol	11.93	19.98	8.05
1-butanol	14.75	19.78	5.03
n-pentane	20.94	21.11	0.17
n-hexane	7.28	10.95	3.67

From this, we found that n-pentane was the coldest of the solutions, and Methanol was the most warm.

Pressure

Stuff about Pressure!

What is pressure?
Pressure is a "physical force exerted on or against an object by something in contact with it" (Google.com)


When talking about pressure, you might hear words such as:
Pascals- metric unit of pressure
               N/M2
Barometer- measures pressure
Atmospheric pressure- pressure of the air
Kinetic molecular theory-there are particles out in the air moving around
Dipole-




In colder degrees, molecules don't move as fast through the air. The barometer would then demonstrate that the atmospheric pressure is higher.




The equation to solve for what pressure there is is...
P total=P1 + P2 + ... + Pn (Pressure total l= Pressure 1 + Pressure 2 + ... + Pn)




"But what if the molecules in the air got 'sticky'?"
The molecules that are bouncing around tend to stick to things. The biggest change that will occur is boiling points.