Aiming for Grade 4 LOs:

• Calculate the formula mass of substances when the formula is given.
• Balance simple equations
• State a definition of atom economy

Aiming for Grade 6 LOs:

• Calculate the atom economy for a given chemical reaction.
• Explain why using reactions with high atom economy is important.

Aiming for Grade 8 LOs:

• Evaluate different reactions to decide the best production method of a chemical.
• Explain why the sum of the formula masses of the reactants is the same as the sum of the formula masses of the products.