This is Young Bill's collection of old screws and bolts. He used to play with them all of the time as a young child building things in his father's workshop. These screws and bolts used to be shiny and smooth way back when, but now they are all reddish with a rough texture. What do you think has happened here? Is this a physical change?
By now all of you have a very good understanding of what a physical property is. What other properties can substances have besides physical properties? How else can we classify them? If there are other properties besides physical properties, would there also be other changes besdies physical changes? What might those be?
Response should be about 1/2 page long.
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