Classify each of the following as a physical or chemical change
or property.
a. oven cleaners contain sodium hydroxide, which converts
the grease/oil spatters inside the oven to water-soluble mate-
rials, which can be washed away.
b. a rubber band stretches when you pull on it.
c. a cast-iron frying pan will rust if it is not dried after
washing
d. concentrated hydrochloric acid has a choking, pungent
odor.
e. concentrated hydrochloric acid will burn a hole in cotton
jeans because the acid breaks down the cellulose fibers in
cotton.
f. copper compounds often form beautiful blue crystals when
a solution of a given copper compound is evaporated slowly.
g. copper metal combines with substances in the air to form
a green "patina" that protects the copper from further
reaction.
h. bread turns brown when you heat it in a toaster.
i. when you use the perfume your boyfriend gave you for your
birthday, the liquid of the perfume evaporates quickly from
your skin.
j. if you leave your steak on the gas grill too long, the steak
will turn black and char.
k. hydrogen peroxide fizzes when it is applied to a cut or
scrape.