In which of these substances are the molecules probably moving most quickly?

solid iron at −45°c
solid iron at 300°c
liquid iron at 1600°c
liquid iron at 1800°c

it's filtration, but this is an assumption so my apologies if i got this

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.