MIKAYLA VAN DEN BRENK
& LAURA SOFIA GOMEZ
IF YOU MIX BUBBLES WITH ANOTHER SUBSTANCE, THEY WILL LAST
LONGER
|
MIKAYLA VAN DEN BRENK
& LAURA SOFIA GOMEZ
7ª
Vermont School Medellín
|
Colegio Gimnasio Vermont Medellín
Science
7 A
By
Mikayla
van den brenk & Laura sofia gomez gomez
Medellín, Antioquia
February, 2013
If You Mix Bubble Mix With
Another Substance, It Will Last Longer
Introduction….
Theoretical
Background
Almost every kid loves to blow bubbles –
and wishes that their bubbles don’t pop or evaporate so quickly! This science
fair project will help to determine if adding other substances to a bubble
solution can help the bubbles last longer. Testing was done by adding corn
syrup, sugar water, and lemon juice the to the bubble solution. LALA
Bubbles are made of a solution containing
soap and water. The structure of bubbles is very similar to a sandwich, because
bubbles are made of a thin layer of water surrounded by two thin layers of soap
particles, and air inside. As you blow a bubble, the air pushes on the
sandwich, expanding layers of water and soap particles until they break apart,
thus popping the bubble. But we will test which substance will increase the
thickness of the bubbles the most, therefore increasing the time before the
bubble pops.MIKY
When the soapy solution is stretched across
a surface (the end of a bubble wand, for example), it forms a thin, filmy sheet
with fairly low surface tension. As air fills the sheet, it takes on a
spherical shape. This is because, as the solution stretches and the surface
concentration of the soap drops, the surface tension rises.LALA To compensate for this increase in
surface tension, the bubble forms into a shape that puts the least amount of
stress on the surface layer. For any given volume, spheres have the lowest
possible surface area. This means that the surface layer has to stretch the
least when forming into a sphere.MIKY
Read
more: How Bubbles Are Made | eHow.com
Hypothesis LALA
Soap bubbles made from solutions containing
lemon will last longer
MIKY
1.
Objectives
a)
If
mixing other substances makes bubbles stronger
b)
Which
substances make bubbles the strongest
c)
Which
substances make the least difference
2.
Materials and Reactives
MATERIALS
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REACTIVES
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3 EMPTY PLASTIC CUPS
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300ml WATER
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A BUBBLE BLOWING TOY
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100ml LIQUID DETERGENT
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1 STOPWATCH
|
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A MEASURING BEAKER
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10mg SUGAR
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A WEIGHING SCALE
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10ml LEMON JUICE
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1 BLACK MARKER PEN
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3.
Procedure
1.
For this science fair project,
the independent variable is the additive added to the bubble solution – soap,
corn syrup, sugar and lemon. The dependent variable is the length of time the
soap bubbles are able to last before bursting. This is measured with a
stopwatch. The constants (control variables) are the room temperature and the
mixing ratio of the bubble solution.
2. Using the black marker pen, the 4 plastic cups are labeled as “soap”, “sugar” and “lemon”.
3. Each cup is filled with 100ml of water. Another 20ml of liquid detergent is added to each cup and mixed with the water. Then, depending on the marking on the cups, 10 ml of corn syrup, sugar and lemon is added to each cup and mixed once more. The cup marked soap will be the control and it contains only a mixture of water and detergent.
4. The bubble blowing toy is dipped into one of the plastic cups and a bubble will be blown. The stopwatch is started and it is observed how long the bubble lasts before it bursts. The experiment is repeated 5 times and the longest time clocked, is recorded in the table given below.
5. Procedure 4 is repeated using the solutions in the other 3 cups. The longest time taken before the bubble bursts is clocked and the results recorded in the table below.
2. Using the black marker pen, the 4 plastic cups are labeled as “soap”, “sugar” and “lemon”.
3. Each cup is filled with 100ml of water. Another 20ml of liquid detergent is added to each cup and mixed with the water. Then, depending on the marking on the cups, 10 ml of corn syrup, sugar and lemon is added to each cup and mixed once more. The cup marked soap will be the control and it contains only a mixture of water and detergent.
4. The bubble blowing toy is dipped into one of the plastic cups and a bubble will be blown. The stopwatch is started and it is observed how long the bubble lasts before it bursts. The experiment is repeated 5 times and the longest time clocked, is recorded in the table given below.
5. Procedure 4 is repeated using the solutions in the other 3 cups. The longest time taken before the bubble bursts is clocked and the results recorded in the table below.
SOLUTION
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SOAP
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SUGAR
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LEMON
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BUBBLE LIFE TIME
(SECONDS)
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4.
Observations
and Results
5.
Conclusions
References
6.
Appendix
Pictures,
graphs, videos, etc.
Games:
