Identify the following as being true or false to the left of the sentence. _____ 15. A change in size or shape is a physical change. _____ 16. A chemical change means a new substance with new properties was formed. _____ 17. An example of a chemical change is when water freezes. _____ 18. When platinum is heated, then cooled to its original state, we say this is a physical change. ____ 19. When milk turns sour, this is a physical change because a change in odor does not indicate a chemical change. ____ 20. When citric acid and baking soda mix, carbon dioxide is produced and the temperature decreases. This must be a chemical change.
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Answer:
15. True
16. True
17. False
18. True
19. False
20. True
This is the answers in the key