Reversible And Irreversible Changes


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Reversible And Irreversible Changes

  1. 1. Unit 6D: Reversible and irreversible changes Unit 6D: Reversible and irreversible changes Reversible and irreversible changes T
  2. 2. Unit 5D: Vocabulary <ul><li>Some useful words </li></ul><ul><li>Reversible change </li></ul><ul><li>Irreversible </li></ul><ul><li>Soluble </li></ul><ul><li>Insoluble </li></ul>Unit 6D: Reversible and irreversible changes a change that can go forwards or backwards, for example melting and freezing a change that cannot go back, for example burning a material that dissolves a material that doesn’t dissolve V
  3. 3. Unit 6D: Mixing Materials <ul><li>Mixing Materials </li></ul><ul><li>You are to mix the following materials with water and record your observations. The materials are: </li></ul><ul><li>Sand Flour </li></ul><ul><li>Salt Powder paint </li></ul><ul><li>Plaster of Paris Baking powder </li></ul>Unit 6D: Mixing Materials: L.O. 1,2 : N.C.
  4. 4. Unit 6D: Mixing Materials <ul><li>Mixing Materials – support slide </li></ul>Unit 6D: Mixing Materials: L.O. 1,2 : N.C. Material Soluble Insoluble Observations Sand Flour Salt Powder paint Plaster of Paris Baking powder
  5. 5. Unit 6D: Separating Insoluble Materials <ul><li>Separating Insoluble Materials </li></ul><ul><li>How can we separate each? </li></ul><ul><li>Describe how you would separate the sand from the water. Then describe how you would separate the salt from the water </li></ul><ul><li>Now you can carry out the practical </li></ul>Unit 6D: Separating Insoluble Materials: L.O. 3: N.C Sand and water Salt and water
  6. 6. Unit 6D: Separating Rock Salt <ul><li>Separating Rock Salt – Extension </li></ul><ul><li>Rock salt is a mixture of small rocks and salt, it is often used on roads when it is icy to provide grip and to melt the ice. </li></ul><ul><li>Using your knowledge of dissolving, filtering and evaporating separate a sample of rock salt so you are left with a pile of rock and a pile of salt. </li></ul><ul><li>You will find the following apparatus useful: Funnel, filter paper, beakers, Bunsen burner or water heater. </li></ul>Unit 6D: Separating Rock Salt (Extension) Salt dissolves in water Dissolved substances will pass through filter paper Dissolved solids are left behind when water evaporate
  7. 7. Unit 6D: Irreversible changes <ul><li>Irreversible changes </li></ul><ul><li>Describe what happens in each of the examples. </li></ul><ul><li>Do you think these can be reversed ? </li></ul><ul><li>These are difficult to reverse as new products have been made. </li></ul>Unit 6D: Irreversible changes: L.O. 4, 5: N.C: Cement Vinegar & Bicarbonate of Soda
  8. 8. Unit 6D: Heating Materials <ul><li>Heating Materials </li></ul><ul><li>Heating some materials causes them to change </li></ul><ul><li>Do you think they can be easily reversed? </li></ul>Unit 6D: Heating materials: L.O. 6: N.C.
  9. 9. Unit 6D: Cooling Materials <ul><li>Cooling Materials </li></ul><ul><li>Cooling some materials causes them to change </li></ul><ul><li>Will the egg and the bread change when they cool? </li></ul><ul><li>What happens to the water as it is cooled? </li></ul><ul><li>What happens to the steam as it is cooled? </li></ul><ul><li>Can the changes be easily reversed? </li></ul>Unit 6D: Cooling Materials: L.O. 7: N.C:
  10. 10. Unit 6D: Burning Materials <ul><li>Burning Materials </li></ul><ul><li>Do you think that the ash is the only material produced by burning the paper? </li></ul><ul><li>Gas is also produced. </li></ul><ul><li>What is the difference between heating an object and burning an object? </li></ul><ul><li>Do you think that when an object is burned the process can be reversed? </li></ul><ul><li>Can you think of other everyday examples of objects burning? </li></ul>Unit 6D: Burning Materials: L.O. 8: N.C:
  11. 11. Unit 6D: Burning <ul><li>Burning </li></ul><ul><li>New materials are produced when materials are burned. </li></ul><ul><li>These are often hazardous. </li></ul><ul><li>Produce a poster warning people of the dangers of the fumes given off by burning materials in the home. </li></ul>Unit 6D: Burning: L.O. 9, 10: N.C: A material is burned the change is irreversible
  12. 12. Unit 6D: Summary Unit 6D: Reversible and irreversible changes - summary Reversible & Irreversible Changes Changing materials Mixing Heating Cooling Burning Burning Irreversible New materials formed Gas often given off Irreversible Involves a reaction New materials formed Cannot be removed Reversible Easily reversed Filtering Evaporating Heating Cooling