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Physical and chemical changes

Materials

Activity One:

4 pieces of paper

Scissors

Materials

Activity Two:

Calcium Chloride (order from any science company)

Baking Soda

15 pint Ziploc bags (not the zipper type)

15 small plastic medicine bottles

15 goggles

15 pairs disposable gloves

15 plastic spoons

 

General Directions Physical Changes

Students will cut a hole in an ordinary piece of paper that they will be able to walk through without tearing the paper.

1.        Fold the paper in half like a hot dog.

2.       Make a series of straight cuts from the folded side edge, stopping one cm from the other side.

3.       Turn the paper around and make cuts from the unfolded side to the folded side, stopping two cm from the edge.

4.       Except for the first and last strip at the ends of the paper, snip off the folded ends of the strips about one cm into the paper.

5.       Carefully open up the paper.

 

General Directions Chemical Changes

Students will witness chemical changes involving two powders. Calcium Chloride is used to clear icy roads.

1.        Put one level spoonful of baking soda in the plastic bag.

2.       Put 2 level spoonfuls of calcium chloride into the bag.

3.       Shake the substances together and observe.

4.       Fill the medicine bottle half full of water. Carefully put the uncapped bottle in the bag so that the bottle is sitting still.

5.       Carefully close the plastic bag, squeezing the air out of it.

6.       Zip the bag shut make sure it is sealed.

7.       Tip the bag to spill the water into the calcium chloride and baking soda.