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Cornstarch Experiment - Presentation
6
1. Question
How does the amount of water affect the time it takes for the cornstarch solution to turn back into a liquid.
2. Procedure
Measure and pour 95 ml. of water into the bowl that you should have in front of you.
Measure and pour in 5 ml. of cornstarch then mix with hands (that you should have in front of you)
Quickly pick up the cornstarch solution that you have just created and attempt to role it into a ball, (if you failed, redo the steps) then relax your hand and watch and record the time it takes for the solid cornstarch solution turn back into the solid.
NOW, redo the steps, but this time, do 90 ml. of water and 10 ml. of cornstarch.
Then try 85 ml. of water and 15 ml. of cornstarch.
Then 80 ml. of water and 20 ml. of cornstarch... and so on...
Sir Issac Newton stated individual liquids flow at consistent, predictable rates
cornstarch goo does NOT follow those rules – it can act almost like a solid, and then flow like a liquid
Technically speaking, the solution is a suspension, which means that the grains are not dissolved, they are just suspended and spread over the water.
Cornstarch Grains Under A Microscope
The pressure causes the solution to act like that because of it's shape and size.
It causes the grains to 'lock up' (like a polymer) and hold its shape when pressure is applied to it.
THANK YOU!
6. The Science Behind it
Lab Report
3. Data Table
Independent Variable
Dependent Variable
Cornstarch Experiment
7th Grade/2012
5. Conclusion
Materials:
+ PARTNER
- Bowl
- cornstarch
- water,
- graduated cylinders
- nice work-space