In chemical reactions, there is a conservation of(1) energy, volume and mass
(2) energy, volume and charge
(3) energy, charge and mass
(4) energy, charge and volume

(3) energy, charge, and mass

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.