Question

Which substance can not be broken down by a chemical change ?

1) Na(s)
2) NaCl(s)
3) NaCl(aq)
4) H2O(l)

Answer 1

Na(s)

Step-by-step explanation:

irrespective of it's state, Sodium is an element and elements consists of only one kind of atom and cannot be broken down into a simpler type of matter by either physical or chemical means.