Activities:
Review with students the definitions of liquids and solids. Tell the students that they are going to work with cornstarch and water today to decide if it is a liquid, a solid, or neither.
Divide the students into pairs and give each group one cup of cornstarch, one cup of water, a bowl, a spoon, a fork and a block. Have the students pour the cornstarch into the bowl and then add some of the water while stirring with the fork. They should add enough water that the mixture is thick and gooey.
Have the students complete the worksheet as they manipulate the mixture in different ways. They can press on it, try to pick it up with a spoon, push the block down on it, and set the block on it.
After they have had time to experiment with the mixture, come back together and discuss the results. Tell them that the mixture is called a suspension. It acts like a solid when pressure is applied because the molecules bind together, but when there is no pressure it acts like a liquid because the molecules separate.
Activities:
Review with students the definitions of liquids and solids. Tell the students that they are going to work with cornstarch and water today to decide if it is a liquid, a solid, or neither.
Divide the students into pairs and give each group one cup of cornstarch, one cup of water, a bowl, a spoon, a fork and a block. Have the students pour the cornstarch into the bowl and then add some of the water while stirring with the fork. They should add enough water that the mixture is thick and gooey.
Have the students complete the worksheet as they manipulate the mixture in different ways. They can press on it, try to pick it up with a spoon, push the block down on it, and set the block on it.
After they have had time to experiment with the mixture, come back together and discuss the results. Tell them that the mixture is called a suspension. It acts like a solid when pressure is applied because the molecules bind together, but when there is no pressure it acts like a liquid because the molecules separate.
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