C3-Quantitative chemistry

• relative formula mass


  sum of all the relative atomic masses of the atoms in the molecular formula
• balanced equation 


  a symbol equation with the same number of atoms of each element on both sides
• concentration

  amount of substance dissolved in a certain volume of solution
• mass is conserved


  no atoms are created or destroyed in a chemical reaction so the total masses of reactants and products are also the same
• decrease in mass


  a gas is made during the reaction and escapes the vessel so it’s mass is no longer accounted for
• increases in mass


  a gas from the air id a reactant so its madd is added to the mass in the vessel