MYP 7 Science - Chemistry

MYP 7.3.3: Chemical and physical change

Objectives

  • To observe some physical and chemical changes
  • To define a chemical change as a process in which a new substance is formed.
  • To understand that hard evidence may be difficult to obtain.
  • To know that combustion is a type of chemical reaction
  • To understand that a physical change does not involve a change in chemical identity (smallest particles)

Experiment circus

Showing some physical and chemical processes. Possible choices:

  1. Distillation of copper(II) sulphate solution
  2. Warming coca cola (gaseosa) possible anti-bumping granules
  3. Mixing ethanoic acid (0.1M) and sodium silicate solution (density 1.06 g/cm3)
  4. Dissolving copper(II) sulphate in water (recycle for expt 1)
  5. Heating sulphur in an glycerine bath at 120ºC
  6. Heating iodine using a 'cold finger'
  7. Adding magnesium ribbon to sulphuric acid and igniting the gas

Possible evidence

  • Colour change
  • Production of a gas
  • Temperature change

Teaching notes

The circus needs setting up prior to the class. There are numerous safety issues.

Student Activity

Science Explorer Chemical Interactions: Where's the Evidence? p54-55


Resources

Science Explorer Chemical Interactions: p46-53

Science Spotlight 7: p73-79

 


 
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Copyright: 2003 Isis Publication