Friday 5th September
TODAY WE ARE
LEARNING ABOUT
 What does the relative formula mass tell us?
TODAY'S
KEY WORDS ARE
  • R_l_t_v_  F_rm_l_  M_ss
  • C_mp__nd
  • M_ss  n_mb_r
  • _t_m_c  n_mb_r
    		•

    Memory Anchor:

    YOU WILL SHOW
    YOUR LEARNING BY...

    • Super Challenge:

      Stretch:

      Challenge:

    Key Questions:

    1. How do we calculate the relative formula mass (Mr) of a compound?
      • The relative formula mass (Mr) of a compound is the sum of the relative atomic masses of the atoms in the numbers shown in the formula.
    2. Why must the total relative formula mass of all of the reactants equal that of all of the products made?
      • The law of conservation of mass states that no atoms are lost or made during a chemical reaction so the mass of the products equals the mass of the reactants. Therefore the total atoms before and after a chemical reaction must be the same.