Out of these: which is an acid, base or neutral

1. NaCl
2.Na2SO4
3.AlCl3
4.Li3PO4
5. ZnBr2

What is the relation between concentration of reactants and the rate of chemical reaction?

Why are pipes bursting in the in extremely cold weather?

The chemical equation below shows the reaction of sodium (na) and chlorine (cl) to form sodium chloride (nacl). 2na + cl2 → 2nacl in this equation, which of the following is a reactant? i. sodium ii. chlorine iii. sodium chloride