Difference between revisions of "3-ELE-04"

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(Notes)
(Starter)
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==Starter==
 
==Starter==
 
*Class act as charges in a circuit.  Which way would they move if they were i) positive  ii) negative?
 
*Class act as charges in a circuit.  Which way would they move if they were i) positive  ii) negative?
 +
*Shuttling ball experiment - giving the idea of flow of charge
 
*Cannot see charges moving in a metal but can observe what happens in a liquid (electrolyte)
 
*Cannot see charges moving in a metal but can observe what happens in a liquid (electrolyte)
  

Revision as of 09:49, 8 January 2008

Outcomes

  • Pupils can:

Reinforce Current is the rate of flow of charge Q = I × t

Introduce idea of free electron movement in metals- which way do they flow? Conventional current.

Show charge flow in an electrolyte – ions = charged particles

Specification References

2.15 understand that current is the rate of flow of charge

2.16 recall and use the relationship between charge, current and time : charge = current × time

2.17 recall that electric current in solid metallic conductors is a flow of negatively charged electrons

Starter

  • Class act as charges in a circuit. Which way would they move if they were i) positive ii) negative?
  • Shuttling ball experiment - giving the idea of flow of charge
  • Cannot see charges moving in a metal but can observe what happens in a liquid (electrolyte)

Main Body of Lesson

Class Practical: Electrolysis

  • Plan and predict: which side to place the 10p. What will be observed? What will change if you keep the circuit running for longer?
  • Coating 10pence pieces with copper during electrolysis of CuSO4

Plenary

  • How does the 10pence piece get copper coated?

Homework

Worksheet

Additional Information

Resources Required

Class practical electrolysis kits and 10pence pieces, accurate mass balance

Textbook References

Website References

Skills Addressed

  • Planning an experiment
  • Predicting an outcome

Safety/Hazards

Notes

Students need guidance during prediction and planning stages:

  • What charges are on copper ions?
  • Talk about direct proportion.