15. During an investigation, students dropped a tarnished penny into a solution of acetic acid and sodium chloride. Tiny bubbles formed around
the penny, and the penny was less tarnished after two minutes of soaking
in the acetic acid and sodium chloride solution. The student inferred that a
chemical reaction occurred. What evidence supports the student's
inference? *
The penny experienced a color change, and a gas was produced.
The penny experienced a color change, and a precipitate was formed.
The penny experienced a color change and is in a new state of matter.
The penny experienced a color change and produced light.
O