Classify the following changes as physical or chemical. Even if you are incorrect in your assessment, you should be able to defend why you chose as you did.
a. grape juice turns to wine ______
b. wood burns to ashes ______
c. water begins to boil _______
d. a broken leg mends itself ______
e. grass grows ______
f. an infant gains 10 pounds ______
g. a rock is crushed to powder ______
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