Which equation shows a conservation of mass?
(1) na + cl2 --> nacl
(2) al + br2 --> albr3
(3) h2o --> h + o2
(4) pcl5 --> pcl3 + cl2

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car