Answer:
a. Rubbing alcohol evaporates on your hand - physical change
b. Gasoline is ignited - chemical change
c. You take in antacid to settle your stomach - chemical change
d. Milk goes sour - chemical change
e. Photosynthesis - chemical change
f. Boiling of water - physical change
g. Freezing of water - physical change
i. Rusting of iron - chemical change
Explanation:
A physical change leads to change in chemical composition of a substance. For example, volume, mass, density, shape, boiling, freezing etc are all physical changes.
On the other hand, a chemical change leads to change in chemical composition of a substance. For example, combustion of a substance, oxidation etc are all chemical changes.
Hence, given changes are classified as follows.
a. Rubbing alcohol evaporates on your hand - physical change
b. Gasoline is ignited - chemical change
c. You take in antacid to settle your stomach - chemical change
d. Milk goes sour - chemical change
e. Photosynthesis - chemical change
f. Boiling of water - physical change
g. Freezing of water - physical change
i. Rusting of iron - chemical change
