11. Label each of the following as either a physical process or a chemical process.
a. corrosion of aluminum metal.
b. Melting of ice.
c. Pulverizing an aspirin.
d. Digesting a candy bar.
e. Explosion of nitroglycerin.
f. Milk turning sour.
g. Burning of paper.
h. Forming of frost on a cold night.
i. Bleaching of hair with hydrogen peroxide.
j. A copper wire is hammered flat.