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1.04 Properties of Water

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by

Raquel Thompson

on 12 June 2014

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Transcript of 1.04 Properties of Water

Hypothesis:
If soap is added to water, then it will break the hydrogen bonds that create surface tension.

Observations:
Independent Variable(IV)- Dish Detergent, Dependent Variable(DV)- Whether or not the surface tension allows for the pepper to float, Controlled Variable(CV)- Water.
First I filled a bowl with half a cup of water(CV) and sprinkled black pepper over it. I then observed the black pepper floating on top of the water. I then filled another bowl of the exact size with half a cup of water and poured in one squirt of dish detergent(IV). Next I sprinkled black pepper on top of the water. Everything was kept the same except for the fact that only one bowl had dish detergent in it.

Conclusion
The effect soap has on water when they are combined is the soap weakens the waters hydrogen bonds. When these bonds are weakened it makes it easier for the surface of water to be stretched or broken. Water alone has a stronger surface tension than many other substances but when combined with soap its surface tension weakens.
1.04 Properties of Water
Question:

What affect will adding soap to water have on surface tension?
Procedure:
Independent Variable(IV)- Dish Detergent, Dependent Variable(DV)- Whether or not the surface tension allows for the pepper to float, Controlled Variable(CV)- Water.

First I filled a bowl with half a cup of water(CV) and sprinkled black pepper over it. I then observed the black pepper floating on top of the water. I then filled another bowl of the exact size with half a cup of water and poured in one squirt of dish detergent(IV). Next I sprinkled black pepper on top of the water. Everything was kept the same except for the fact that only one bowl had dish detergent in it.

Data:
NO DATA
Resources:
"The Effect of Droplet Size on Surface Tension." The Effect of Droplet Size on Surface Tension. N.p., n.d. Web. 11 June 2014.

Snelson, Chareen. "Surface Tension." Surface Tension. N.p., 2004. Web. 10 June 2014.
Application:
In the modern world antiseptics are commonly used. The chemicals in antiseptics are related to the chemicals in soap both cleaning and disinfecting to some degree. An antiseptic like dettol, has a low surface tension so it can spread faster. In that case having a low surface tension helps to quickly heal wounds and disinfect cuts. Water is an ingredient in dettol. Before the water was combined with the other ingredients in dettol, it had a high surface tension. Just like how I combined the soap to the water, when the other ingredients were added they weakened the surface tension and made the dettol .
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