Lesson 2: Pure Substances



In the first lesson, you learned that substances can be identified and classified by determining physical and chemical properties. You also learned that substances can also be classified into categories based on how many types of particles they contain.


In this lesson, you will take a closer look at types of particles and discover ways these can be organized and combined.



 
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In this lesson, you will learn:

  • how elements are organized in the periodic table
  • how to tell whether a substance is metal or non-metal
  • about the relationship between elements and compounds
  • how to write element symbols and chemical formulas
  • how elements and compounds are used in society


 

Key terms for this lesson:

  • elements
  • periodic table
  • metals
  • non-metals
  • compounds
  • decomposition reaction
  • element symbol
  • chemical formula