A un tubo de ensayo que contiene agua se le agregan 10gr de sal de cocina, posteriormente se agita la mezcla y se observa que una parte de la sal no se disuelve quedando en el fondo del tubo. Es válido afirmar que en el tubo de ensayo el agua y la sal conforman:  1)Una mezcla homogénea.

2)Un compuesto.

3)Una mezcla heterogénea

4)Un elemento​

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.