# Intermolecular Forces Lab Essay Sample

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Purpose:
The purpose of the lab was to investigate and demonstrate hydrogen bonding and London dispersion bonding in water and rubbing alcohol.

Hypothesis:
I believe water will have the greater surface tension because rubbing alcohol’s density is lower than water’s.

Materials:
* Water
* Isopropyl alcohol (rubbing alcohol)
* Pennies
* Paper clips
* Cups or jars
* Wax paper
* Eyedropper

Procedures:
Part 1: Surface tension and vortex:
* Fill one flask half way full with rubbing alcohol.
* Fill another flask half way full with water.
Caution: Plug the flask to prevent vapors from polluting the room.
* Carefully swirl each flask to create the vortex.
* Stop swirling each flask and time how long the vortex lasts.
* Record the data.

Part 2: Surface tension and droplet shape:
* Use an eyedropper to transfer one drop of water and rubbing alcohol onto the wax paper.
* The liquid with higher tension will not spread out far while lower tension will spread out. * Identify with liquid has the higher tension and record the data.

Part 3: Surface tension and impenetrability:
* Fill a cup or jar with water and another with rubbing alcohol.
Gradually lower down a paper clip into both liquids using a cradle motion with another paper clip. * Identify with liquid can withstand the weight of the paper clip and record the data.

Part 5: Comparing surface tension of liquids:
* Fill a jar to the brim with rubbing alcohol and another with water. * Examine the rim of each jar.
* Carefully add pennies, one by one, into the jar.
* Stop once the liquid overflows. Record the data.