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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.
Combustion is a rapid oxidation process, or, in plain language, burning. An exothermic reaction is a physical or chemical reaction that releases energy in the form of heat. It involves breaking higher-energy bonds and forming lower-energy bonds. An endothermic reaction is a process in which heat energy is absorbed from the surroundings by the reactants.