Abar of gold is melted into liquid the liquid is then poured into a mold to make pieces of jewelry is the process a chemical change or a physical change ?

Physical change because it's only changing the shape of the gold.

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.

(no3)⁻n has oxidation number x,o has oxidation number -2.(x*1 -2*3) charge of the nitrate ion, and we know that charge of the nitrate ion =-1.so,(x*1 -2*3) =-1x-6=-1x=+5answer a. +5.