• A chemical reaction is a process in which some substances change into different substances.
  • Substances that start a chemical reaction are called reactants, and the substances produced are called products.
  • There are four types of chemical reactions, including decomposition, replacement, and combustion.
  • All chemical reactions involve energy.
  • Energy is used to break bonds in reactants and released when new bonds form in products.
  • Exothermic reactions release energy to the environment, often in the form of heat or light.
  • When it comes to energy, the burning of wood is an exothermic reaction.
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