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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.
Paper is mostly cellulose strands since it is made from wood or cotton most of the time. Cellulose is a long polymer of glucose, a sugar, that is composed of carbon, oxygen and hydrogen. The exothermic chemical reaction, fire, releases the carbon in up to three forms: elemental carbon, carbon dioxide and carbon monoxide.