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this is bob and bob is doing a science project for school dealing with chemical and physical change
while bob was doing his project he got hungery so he put some bread in the toaster for a snack
once the bread was done toasting he saw that it had turned brown and since there was a new substance that was formed he knew that it was a chemical change
bob then wanted butter on his toast so he cut the a piece of butter off and put it on the toast
bob then whent to see if cutting something was a chemical change or a physical change and found out that it was a physical change since no new substance was formed
And just like that Bob had finished his science project without meaning too
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