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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.
(Not only is it an enormous fuel source, it may also be toxic in a fire.) Once the paper burns off, the gypsum goes to work protecting the substrate; but initially, the painted paper fascia will flare and can wildly accelerate temperature rise and trigger flashover in adjoining rooms.