Mass Conservation:

• Chemical reaction


  Rearranging atoms to make new chemicals
• Conservation of mass


  Matter is not created or destroyed during a chemical reaction

  
• Mass of products =


  The mass of the reactants
• Balanced symbol equation


  A symbol equation in which there are equal numbers of each type of atom on either side of the equation

  
• Reason mass decreases in a reaction


  A new gas is formed
• Reason mass increases in a reaction

  A reactant is a gas
• Coefficient


  Big numbers in front of formulae which multiply a formula (e.g 2NaCl)

  
• (s)


  Solid
• (l)


  Liquid
• (g)


  Gas
• (aq)


  Aqueous (dissolved water)
• Word equation


  An equation in which the reactants and products in a chemical reaction are represented by words
• Reactant


  A starting material in a chemical reaction

  
• Products


  The new substance produced by a chemical reaction.