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.