Essay on Biology Lab for virtual school.. Lesson 1.04

774 Words Oct 6th, 2013 4 Pages
T’Chaya Richardson October 19, 2013

Lesson 1.04
Properties of WATER

Problem Statement:

What effect will adding soap to water have on surface tension?

Research:

When an object falls onto the surface, it has to push the water molecules apart. If the effect of the weight of the object is insufficient to match the attractive forces between molecules in the surface layer, the object will not enter the surface.

www.exploration.edu/rohn/bubbles/soap.html
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4. After I added the drop that caused the water to flow over, I recorded how many drops stayed on the penny, and I then dried the penny with a paper towel. 5. I repeated steps two through four, four times.
6. I took 100 ml of water and poured it into a beaker.
7. I got 3 ml of soap.
8. I added the 3 ml of soap to the beaker and stirred the solution 40-50 times with a fresh pipette.
9. I filled the pipette with the soapy water solution and began to start adding drops of the solution to the same penny, from the distance of ½ centimeter, at a rate of one drop per second.
10. After adding the drop that caused the soapy water to flow over, I recorded how many drops stayed on the penny, and I washed the penny under running Water And dried it with a paper towel.
11. I repeated steps nine and ten, four more times.

Observations:

The soap is thick and the penny is rough. The tap water latest longer than the soapy water

Data:

Drops of Tap and Soapy Water Added to a Penny
Trail 1 Trail 2 Trail 3 Trail 4 Trail 5 Average
Drops of Tap Water 35 28 11 15 39 25.5
Drops of Soapy Water 20 16 11 26 15 1.3

I got my average from using Microsoft Excel

Conclusion:

I have accepted my hypothesis because of the results of the data from this lab. In

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