What distinguishes a chemical property from a physical property? A. Chemical properties describe the characteristics of a substance that are directly observable without changing the substance.

B. Chemical properties are only observable when a substance changes into a new substance.

C. Chemical properties always change depending on temperature or pressure.

D. Chemical properties only describe subjective characteristics that cannot be measured with scientific tools.

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.