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Question 3.2: Classify each of the following as a physical or chemical cha...

Classify each of the following as a physical or chemical change:

a.  A gold ingot is hammered to form gold leaf.

b.  Gasoline bums in air.

c.  Garlic is chopped into small pieces.

d.  Milk left in a warm room turns sour.

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a.  A physical change occurs when the gold ingot changes shape.
b.  A chemical change occurs when gasoline bums and forms different substances with new properties.
c.  A physical change occurs when the size of the garlic pieces changes.
d.  A chemical change occurs when milk ntms sour and forms new substances.

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