Asubstance that cannot be broken down into a simpler substance by ordinary chemical or physical means is a what ?

Chlorine and water react to form hydrogen chloride and oxygen, like this: 2cl2 (g) + 2h2o (g) → 4hcl (g) + o2 (g) also, a chemist finds that at a certain temperature the equilibrium mixture of chlorine, water, hydrogen chloride, and oxygen has the following composition: compound concentration at equilibrium cl2 0.55m h2o 0.57m hcl 0.53m o2 0.34m calculate the value of the equilibrium constant kc for this reaction. round your answer to 2 significant digits.

8. what happens to matter during a chemical reaction

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?