balancing chemical equations

• a chemical reaction occurs when an atom of one, two or more chemicals join together in a different way.
• an example of chemical reaction is wood burning, what happens to the atoms ?

  the carbon and hydrogen atoms join with oxygen atoms to form carbon soot, carbon dioxide (co2) and water (h2o)
• what is a reactant ?


  a reactant are the substances present at the start of a chemical reaction
• what is a product ?

  are the substances present at the end of a chemical reaction