Types of reaction

• Synthesis

  A+B —>AB
• Descomposition

  AB —> A+B
• Single displacament

  AB+C —> AC+B
• Double displacement

  AB+CD —> CB+AD
• Combustion

  AB+O2 —> AO+OB
• Element

  Pure substance made of only one type of atom
• Compound

  Is a substance made of two or more type of element
• Chemical changes

  Create one or more new substances. It involves breaking or making chemical bonds between atoms.
• Physical changes

  Changes only in appearance. New substance is not created and chemical bones are not formed or broken.
• Chemical reaction

  Atoms are rearranged during chemical reactions, and are not lost or gained
• Law of conservation of mass

  Mass is not created nor destroyed.
• Reactants, arrow, products
• Balanced

  The number of atoms in the reactants is the same as in the products
• Unbalanced

  The number of atoms in the reactants is not the same as in the products
• Endothermic

  gets colder
• Exothermic

  Gets hotter
• Molecule

  Group of atoms bounded together