The person above above above me is very very good awnswer hope this helps
Answer:
the law of conservation of mass is whatever goes into a reaction comes out nothing is lost or gianed.
Explanation:
The correct chemical formulae is CsBr
4. A
because PbCl2 is an ionic compound and it's solid, so it's a substance.
It cannot be mixture, because it's a pure molecule.
5. D
despite that both substances are gases, colorless they are different molecules, so they should have different either chemical and physical properties
6. C
this substance made from W atoms and others are made from molecules
