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Demo Project

Demo Project - Stacey Viscosity is the term used to...

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CHEM 11 Demo Project ( Grizelle) Today we will be looking at the mixture of cornstarch and water. Cornstarch is a polymer, so it does not have an exact chemical formula, but we are going to be focusing on the physical change that happens when we combine them together. ( Stacey) What do you think will happen when we mix cornstarch and water? Will it turn into a liquid or solid? *Ask students to vote ( Grizelle) *Reveal the cornstarch mixture in the bowl and in the plastic bag. Demonstrate the physical properties – tap hard on the mixture and it’s hard like a solid, put your finger slowly into it and it is soft and acts like a liquid – and pass items around the room
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Unformatted text preview: ( Stacey) Viscosity is the term used to describe how fast or slow a liquid flows. Most fluids are described as Newtonian fluids, because they have a viscosity that only depends on the temperature. This mixture of cornstarch and water is what we would call Non-Newtonian, because the viscosity depends on the force applied and how fast the object is moving through the liquid. ( Grizelle) This example can be compared to quicksand. If you slowly walk out of quicksand, you will be able to escape. However, any sudden movements to struggle out will apply pressure to it, making the quicksand hard and more difficult to escape....
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