<span> 1.04
Properties of Water</span>
Question: What
effect will adding soap to water have on surface tension?
Hypothesis<span>: If,
soap is added to the water slowly dropped on a penny then, the penny will hold
more water. </span>
Independent/Dependent/Control
Variables: Independent: the amount of soap/oil; Dependent: the penny;
Control: amount of oil/water given
Materials: 3 cups,
water, canola or olive oil, dish soap, a pipette and or needle/syringe, pennies
<span>Procedure:
</span>
<span>·
</span>Gather three identical cups
<span>·
</span><span>Add water to the first one (1/3 cup of water in each), add water and soap in the second one,
and olive or canola oil in the third. </span>
<span>·
</span>Lay out three pennies.
<span>·
</span>Take pipette and slowly bring water in from cup #1,
drop onto penny until water falls over, record results of how many drops it
took.
<span>·
</span>Repeat with cup numbers 2-3 and record
information/data.
Data/Observations: With the
regular water on a penny, I noticed that only 13 regular drops could fit on
without falling over.
<span>With the water+soap, it got up to 24 drops before falling
over. Then on the 25th drop, the mixture fell off. </span>
With the oil, it was the highest at 29 drops before falling
over slowly. Therefore, oil holds the most surface tension in this experiment.
