Revision as of 06:31, 4 January 2009

Outcomes

• Pupils can use the equation: Q = I × t
• Pupils can identify the direction of movement of charge in a wire, charge in an elecrolyte and the direction of flow of conventional current.

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

• Demonstrate potassium permanganate in amonia on filter paper, resting on a slide in an electric field. Alternatively view the movement of ions.

Main Body of Lesson

Class Practical: Electrolysis

• Use this worksheet to plan an experiment to completely coat a 10p coin with copper as quickly as possible.
• The pupils make a detailed prediction as to which terminal the 10p should be placed and what the other variables should be set at in order to achieve the quickest coating.
• The pupils observe (time) the coin being coated and class data is pooled to be analysed at the end. A bar graph is used to present the data.

Plenary

• Class act as charges in a circuit. Which way would they move if they were i) positive ii) negative? What happens in a solid and a liquid?

Homework

Additional Information

Resources Required

Movement of ions demo with potassium permanganate and amonia.

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

Textbook References

Website References

Skills Addressed

Safety/Hazards

• High voltages

Notes