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1. A chemical reaction involves the rearrangement of atoms to form new substances with different chemical properties. In the equation given, methane (CH4) is reacting with oxygen (O2) to form carbon dioxide (CO2) and water (H2O). This indicates that a chemical change is occurring, as new substances are being formed.
2. The burning of methane is an exothermic reaction. This can be determined by the fact that heat is released during the reaction, as evidenced by the hot, blue flame that is produced when methane burns. Additionally, the reaction is spontaneous and releases energy in the form of light and heat, which are characteristics of an exothermic reaction.