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?

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.