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A. Burning a piece of paper is technically called combustion. It represents a chemical reaction whereby the carbon compounds in the paper are oxidized into different chemicals like carbon dioxide and water vapor. This is a chemical change.
Chlorine gas and hypochlorites are more commonly used to bleach virgin paper pulp, but can be used in recycled paper as well. Chlorine produces dioxin, a toxic, carcinogenic chemical that makes its way into the air and water.