Explain what a compound is and how you can tell one by looking at a chemical formula?

A compound is a pure substance of 2 or more DIFFERENT types of atoms, chemically bonded in a fixed ratio (ex: NH3, H2O, and CO2)

The formulas will all be similar to the previous examples.

Explanation:

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.