Traditional elements failed in food packaging.

(1) PVC and polyethylene are two common plastic products in life. In actual operation, a small amount can be identified by observing the combustion phenomenon. PVC is not easy to ignite, it will emit black smoke when burning, and because it contains chlorine, it will emit acid and irritating gas. Polyethylene is easy to ignite, and it does not smoke or smell when burning.

So the answer is:? ? ? ? Not easy to burn, smoke when burning, smelly? Flammable, smokeless and tasteless when burning? (2) PVC mainly contains three elements: C, H and Cl. According to the law of conservation of mass, the acidic product produced after ignition should be hydrogen chloride. Hydrogen chloride gas is acidic and will cause environmental pollution if it is discharged into the air.

So the answer is: hydrogen chloride; Burning waste plastics will produce harmful gases and pollute the environment.