Purity and formulations

• what is a pure substance?

  single element or compound, not mixed with any other substance
• what is a formulation and how is it made. give examples

  • mixture of compounds in measured quantities that has been designed as a useful product
  • formulations include fuels, cleaning agents, alloys, medicines, fertilisers. e. g. alloys are mixtures of metals, harder than pure metals so have a particular purpose