Which of the following explains why elements in column 17 (the halogens) are very reactive?Kat is investigating a compound and sees that it has even stronger hydrogen bonds than water. What can Kat conclude is most likely true about the specific heat of this compound?

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products

law of conservation of matter

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)