Download presentation
Presentation is loading. Please wait.
Published byRosalind Fowler Modified over 8 years ago
1
STEM Project Marley Miller Ms. Barrett - 2nd Grade Marley Miller Ms. Barrett - 2nd Grade
2
Scientific Experiment Question What is the effect of the amount of rubbing alcohol on the consistency of a cold gel pack? What is the effect of oxygen on the temperature of a heat pack? What is the effect of the amount of rubbing alcohol on the consistency of a cold gel pack? What is the effect of oxygen on the temperature of a heat pack?
3
Experiment Prediction Cold gel pack prediction: We can make this using 2 zip-lock freezer bags, water, rubbing alcohol and food color. I think using less rubbing alcohol will create a gel-like substance because it does not freeze. Heat pack prediction: We can make this using 2 zip-lock bags, vinegar, baking soda, pan and kitchen stove. I think removing oxygen will allow the heat pack to increase in temperature.
4
Procedure: Cold Gel Pack For this experiment we conducted three tests using different rubbing alcohol measurements in the mixture.
5
Step 1: Measure and combine water and rubbing alcohol. Test bag 1 - 1.5 cups of water and 1 cup of rubbing alcohol Test bag 2 - 1.5 cups of water and.5 cup rubbing alcohol Test bag 3 - 1.5 cups of water and.25 cup rubbing alcohol Test bag 1 - 1.5 cups of water and 1 cup of rubbing alcohol Test bag 2 - 1.5 cups of water and.5 cup rubbing alcohol Test bag 3 - 1.5 cups of water and.25 cup rubbing alcohol
6
Step 2: We then added food coloring so we could tell them apart and poured liquid into the bag Test bag 1 - orange Step 2: We then added food coloring so we could tell them apart and poured liquid into the bag Test bag 1 - orange
7
Test bag 2 - blue Test bag 3 - green
8
Step 3: We removed the excess air from each bag before sealing them. Step 4: They were double bagged to prevent leaking and placed in the freezer overnight. Step 3: We removed the excess air from each bag before sealing them. Step 4: They were double bagged to prevent leaking and placed in the freezer overnight.
9
Procedure: Heat Pack For this experiment we used 4 cups of vinegar and 4 tablespoons of baking soda. Step 1: Pour the vinegar into a pan on the stove and slowly added the baking soda while stirring continuously. For this experiment we used 4 cups of vinegar and 4 tablespoons of baking soda. Step 1: Pour the vinegar into a pan on the stove and slowly added the baking soda while stirring continuously.
10
Step 2: Once the baking soda was dissolved we turned the stove to medium. Step 3: We let the mixture to simmer for 45 minutes. This process evaporates the excess water from the mixture. Step 4: Once white crystals begin to form around the side of the pan we removed it from the stove. There is a small amount of light yellow colored liquid that remains in the pan. Step 5: This liquid is then poured into one of the zip-lock bags and placed into the freezer for 10 minutes to cool. Step 2: Once the baking soda was dissolved we turned the stove to medium. Step 3: We let the mixture to simmer for 45 minutes. This process evaporates the excess water from the mixture. Step 4: Once white crystals begin to form around the side of the pan we removed it from the stove. There is a small amount of light yellow colored liquid that remains in the pan. Step 5: This liquid is then poured into one of the zip-lock bags and placed into the freezer for 10 minutes to cool.
11
Step 6: Place a pinch of the remaining white crystals from the pan into the zip-lock bag of liquid. This causes a chemical reaction turning the liquid into a more solid-like state and an increase in temperature.
12
Observation: Cold Gel Pack The following morning we removed the bags from the freezer. Test bag 1 - The consistency of the orange bag had not gelled and contained too much liquid. Test bag 2 - The consistency of the blue bag was an improvement, however it still contained liquid. Test bag 3 - The consistency of green bag was a perfect gel-like substance SUCCESS! The following morning we removed the bags from the freezer. Test bag 1 - The consistency of the orange bag had not gelled and contained too much liquid. Test bag 2 - The consistency of the blue bag was an improvement, however it still contained liquid. Test bag 3 - The consistency of green bag was a perfect gel-like substance SUCCESS!
13
Observation: Heat Pack For this experiment we conducted two tests. The first test, we did not remove the excess oxygen from the zip-lock bag before sealing it. For the second test, we removed the excess oxygen from the zip-lock bag before sealing it. The first test bag did gradually change into a solid substance however it did not increase in temperature. The second test bag did change into a solid substance and there was a very noticeable increase in temperature. For this experiment we conducted two tests. The first test, we did not remove the excess oxygen from the zip-lock bag before sealing it. For the second test, we removed the excess oxygen from the zip-lock bag before sealing it. The first test bag did gradually change into a solid substance however it did not increase in temperature. The second test bag did change into a solid substance and there was a very noticeable increase in temperature.
14
Experiment Conclusion What did you learn? You can change the outcome of an experiment by altering the measurements of your ingredients. How did you make sure it was a fair test? The only thing changed in this experiment was the rubbing alcohol, everything else remained the same. What else do you want to try in the future? Next year, I’d like to do an engineering project and build a robot. What did you learn? You can change the outcome of an experiment by altering the measurements of your ingredients. How did you make sure it was a fair test? The only thing changed in this experiment was the rubbing alcohol, everything else remained the same. What else do you want to try in the future? Next year, I’d like to do an engineering project and build a robot.
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.