Pls hel Is the law of conservation of mass observed in each equation?

1. 2KClO3=2KCl+3O2

2. CaCO3+2HCl=CaCl2+H2O+CO2

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.