Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. (Chem only) What is mol/dm3 the unit of measurement for?
   • mol/dm3 is a measure of concentration. It tells us how many moles of that substance you would find in a dm3
2. (Chem only) How can we calculate the number of moles of solute in a given volume of a solution?
   • The amount in moles of solute of solute in a given volume of solution can be calculated from its concentration in mol/dm3 multiplied by the volume of the solution in dm3.
3. (Chem only) What technique can we use if the volumes of two solutions that react completely are known and the concentration of one solution is known, to calculate the concentration of the other solution.
   • A titration reaction
4. (Chem only) How can we calculate the mass of a solute within a solution if we know the concentration in mol/dm3?
   • mass of solute = (concentration (mol dm-3) / relative formula mass) x volume of solution (dm3)
5. (Chem only) What is the difference between a strong and weak acid?
   • A strong acid will fully dissociate from all of its H ions whereas a weak acid won't