Revision as of 09:50, 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

Shuttling ball expt with EHT supply

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.