Which three examples represent physical changes?
a. an empty can is crushed
b. hydrochloric acid and sodium hydroxide react to produce salt and water
c. a log burning in the fireplace
d. a mirror is shattered into pieces
e. heat is added to a solid substance and it starts to melt
f. a pan rusts at the edges
a. an empty can is crushed
d. a mirror is shattered into pieces
f. a pan rusts at the edges