MYP 8 Science - Chemistry

MYP 8.5.4: Compounds and the law of constant composition, formulation


  • To know that all chemical compounds have a corresponding formula that represents the numbers and types of atoms in the simplest building block to that compound - the law of constant composition
  • To understand the concept of valency
  • To correctly use subscripts and element symbols to write formula.
  • To know the formulae for some simple binary and ternary compounds, water, ammonia, sodium chloride, hydrochloric acid.
  • More complicated formula include sulphuric acid, nitric acid, sodium hydroxide, copper(II) sulphate.

Student activities

Students could make cards to represent group 1, 2 and 6 & 7 elements (easier if the teacher provides the cards printed onto card to cut out).

They can then play the valency game in groups.



Science Explorer Chemical Building Blocks - p12

Valency cards (metal)

Valency cards (non-metal)

Valency card game rules

Teaching notes

The periodic table main groups 1, 2, 3, 5, 6 & 7 can be used for simple valency in formulating binary compounds.

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Copyright: 2003 Isis Publication