Chemistry-Unit A Final

• COMPOUNDS

  • 2 or more elements, One type of particle, All the particles have the same properties, Example: salt, water
• Classifying substances

  1. 2 types of classification

  2. Physical properties: physical appearance and composition, Boiling point, melting point, ductility, malleability, lustre

  3. Chemical properties: Reactivity of a substance - reaction with heat, reaction with water, ability to burn etc.

  4. Evidence of a chemical reaction has taken place: C - colour, O - odour, S - solid (precipitate), G - Gas, E - Energy
• Physical Change--- NO NEW SUBSTANCES ARE FORMED
• Do Now: Copy down Figure A1.9 on page 14
• MIXTURES


  • 2 or more substances mixed together, Each substance still has its own unique properties, Example: salt and water – anything dissolved
• Objectives

  1. Distinguish between physical and chemical properties of substances

  2. Classify matter as pure substances or mixtures and further into homogeneous or heterogeneous

  3. Describe evidence for chemical change
• Separating mixtures

  Use the differences in each component's physical properties (differing boiling points, melting points, magnetism, particle size, solubility, etc.)
• How would you separate the following mixtures?

  1. sugar, water, sand

  2. vegetable oil, aluminum filings, table salt