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# Science Fair Project

By: Gracee Street
by

## Gracee Street

on 24 April 2011

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#### Transcript of Science Fair Project

Problem
What will happen when the food coloring and dish soap are carefully
dropped in a container of whole
or 1% milk? Tie-Dyed Milk Hypothesis If I test the surface tension of a liquid adding food coloring and dish soap into container of 1% milk or whole milk, then I would expect the food coloring to mix together the most in whole milk because the surface of the milk outside of the soap drop has a higher surface tension and pulls the surface away from the soap. The fattier the molecules in the milk, the more they're dispesed and move away from the soap.

Variables

The independent variable in my experiment is:
The type of liquid I’m using: 1% or whole milk

The dependent variable in my experiment is:
How much and how quickly the food coloring (milk surface) mixes together at pre-determined times.

I will measure my dependent variable using a stop watch at 30 seconds, and then at minute increments.

The control variables in my experiment are the same type and colors of food coloring, same type of bowl, same dish soap, same cotton swabs and consistent milk temperature. Research

From source 1 I learned that each soap molecule has a long hydrocarbon chain with a tail and a head. Soap molecules combine to make clusters called micelle. When you add soap to a solution, the weak chemical bonds that hold proteins are altered.

From source 2 I learned that surface tension is caused by cohesive forces between liquid molecules. Molecules at the surface stick most to those who are most like them on the surface. This forms a film that makes it harder to move an object through the surface then to move it when it’s submerged.

From source 3 I learned that soap and detergent lower surface tension of a liquid. Detergent soap repels or pushes away fat. Detergent (dish soap) has chemicals that change the properties of a liquid surface.
Materials

• A plate with a large rim.
• Whole milk and 1% milk
• 4 different food coloring colors
• 2 cotton swabs
• Dish soap
• Apron
• Gloves Safety

Some things you will need to do or wear for safety purposes: You will need to wear an apron to protect your skin and clothing. You will also need to wear gloves so you don’t get stains on your fingers. Don’t let anybody drink the milk after you put the food coloring and soap in it. Try to do the experiment as close to the sink as possible, so when you’re finished you can pour it down the drain.

Procedures

1. Get your plate with a large rim (a clear plate).
2. Pour your whole milk or 1% milk in your plate. The milk needs to be about a ½ inch deep and should be room temp.
3. Get your cotton swabs and put the dish soap on the cotton part.
4. Carefully put 1 drop of each color of the food coloring onto the surface of the milk. Make sure the drops are not too close together and that they are near the edge.
5. Put the cotton swab in the middle of the milk and hold there. (Not in the middle of the food coloring.)
6. Watch and see what happens!
7. Record what when you remove cotton swab.
8. Record what happens to food coloring after experiment has been going awhile.
9. Record what happens when you add another drop of soap after colors stop moving.
10. Write down conclusions.
11. Change one variable ( 1% or whole milk.)
12. Begin experiment again using new milk variable.

Trial 2
Milk 1% milk Whole milk

30 sec. No change Colors shot to the edge

1 min. Colors shot to the edge Colors show up in center of dish and begin to swirl out from central point.

2 min. At 2.5 minutes colors show up in the center of the dish and begin to swirl out from central point. Colors swirl in circular pattern
.
3 min. Colors swirl in circular
pattern. Colors merge.

4 min. Cotton swab out Cotton swab out and colors evenly spread outside the edge

5 min. No change No change

6 min. Colors merge. No change.

7 min. Swirling stops No change

8 min. No change Swirling stops. Trial 3

Milk 1% milk Whole milk

30 sec. No change Colors shot to the edge.

1 min. Colors shot out to the edge. Colors show up in center of dish and begin to swirl out from central point.

2 min. No change Colors swirl in circular pattern.

3 min. Colors merge Colors swirl out in circular pattern.

4 min. Cotton swab out Cotton swab out and colors merge.

5 min. Colors evenly spread outside the edge No change.

6 min. Colors evenly spread outside the edge No change

7 min. No change No change

8 min. Swirling stops Swirling stops
Trial 4

Milk 1% milk Whole Milk

30 min. No change Colors shot to the edge.

1 min. Colors shot to the edge. Colors show up in the center of dish and begin to swirl out from central point.

2 min. Colors show up in the center of the dish and begin to swirl out from central point. Colors swirl in circular pattern.

3 min. Colors swirl in circular pattern Colors merge.

4 min. Cotton swab out Cotton swab out and colors evenly spread outside the edge.

5 min. Colors merge No change

6 min. Colors evenly spread outside the edge No change

7 min. Swirling stops Swirling stops

8 min. No change No change
Trial 5
Milk 1% Milk Whole Milk

30 sec. No change Colors shot out to the edge

1 min. No change Colors show up in center of dish and begin to swirl out from central point.

2 min. Colors shot to the edge. Colors swirl in circular pattern

3 min. Colors show up in the center of dish and begin to swirl out from the central point. No change.

4 min. Colors swirl in circular pattern. No change

5 min. Cotton swab out. Colors merge, the cotton swab is out, and the colors evenly spread outside the edge.

6 min. The color merge and they evenly spread outside the edge. No change

7 min. Swirling stops No change

8 min. No change Swirling stops Conclusion

In my hypothesis I said that if I tested the surface tension of a liquid by adding food coloring and dish soap into a container of 1% or whole milk, I would expect the food coloring to mix together the most in whole milk because the soap dissolves the fat molecules and pulls the surface of the milk away from the soap. The food coloring moves with the milk. After my 5 trials with whole milk and 5 trials with 1% milk, I have concluded that my hypothesis is correct because the milk with the most fat had the biggest colorful explosion! This is when we have put the food coloring in the milk. I have put the cotton swab with dish soap on it and started the timer. The food coloring is starting to move. Observations

Whole milk Trial 1
30 secs—green, red, yellow shoot out to edge
Blue not moving much
1 minute—blue moves a bit, colors show up in center and swirl out in circular motion
2 minutes—colors swirling in circle
3 minutes—colors start to mix together
4 minutes—cotton swab out, color spread around edge of dish
5 minutes-7minutes—no big change, colors continue to mix together
8 minutes—movement stops Whole milk Trial 2
30 secs—Red, green, yellow shoot to edge
1 minute—yellow stops moving, other colors appear in middle and begin to swirl out
2 minutes—red and green swirling quickly, yellow and blue on outside
3 minutes—green and red mixing, red and yellow have made orange around outside, pink around edges
4 minutes—cotton swab out, colors evenly spreading, localized center and also around edge
5 minutes—colors continue to mix—no big change besides mixing
6 minutes—looks like tie dye shirt (although blue didn’t mix as well), no big change
7 minutes: same
8 minutes—swirling stops completely Whole milk Trial 3
30 secs—colors shoot out to edge
1 minute—colors begin to move out from center point (yellow slow)
2 minutes—colors begin to swirl, blue, green, red starting to blend
3 minutes—colors swirling in circular pattern, yellow not moving, not merging much now
4 minutes—green and yellow blended, green and red blended, cotton swab out
5 minutes—yellow no change, turquoise color around edge, but no other change
6 minutes—no change, but dots appear within colors
7 minutes: no real change
8 minutes—swirling completely stops
Whole milk Trial 4
30 secs—Colors shoot to edges
1 minute—colors start moving out from middle
2 minutes—colors start to swirl together
3 minutes—blue and red mixing green starts to mix with others
4 minutes—cotton swab out, color swirling slowing, colors pretty even on outside edge
5 minutes—colors continue to swirl from inside out, little bursts of bubbles popping up, but no color moving
6 minutes—no color moving from center, but yellow finally mixed with green and blue on outside
7 minutes—swirling stops Whole milk Trial 5
30 secs—colors move out to edge
1 minute—big blocks of color on outside, but colors begin to show up in middle and swirl out
2 minutes—red, green, blue mixing in circular pattern
3 minutes—no movement, only blue and red mixed
4 minutes—cotton swab out, no other change
5 minutes—2 big kidney bean shaped swirls of mixed colors, colors also mixed around outside edge of dish
6 minutes—no change
7 minutes—same
8 minutes—swirling stops
Trial 1
Milk 1% milk Whole milk
30 sec. No change The colors shot to the edge
1 min. The colors shot to the edge Colors show up in center of dish and begin to swirl out from central point.
2 min. Colors show up in the center of the dish and begin to swirl out from central point. Color swirl in circular pattern
3 min. Colors swirl in circular pattern. Colors merge.
4 min. Cotton swab out. Colors evenly spread outside the edge. Cotton swab out.
5 min. Colors merge. No change
6 min. Colors evenly spread outside the edge. No change
7 min. Swirling stops. No change
8 min. No change Swirling stops.

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