| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
|
Cells contain chemicals which react to produce electricity. |
|
Why are chemical cells useful? |
|
|
|
The voltage produced by a cell is dependent upon a number of factors including the type of electrode and electrolyte. |
|
What factors can affect the voltage produced by a chemical cell? |
|
|
|
A simple cell can be made by connecting two different metals in contact with an electrolyte. |
|
How can a simple chemical cell be made? |
|
|
|
Batteries consist of two or more cells connected together in series to provide a greater voltage. |
|
What is the structure of a battery like? |
|
|
|
In non-rechargeable cells and batteries the chemical reactions stop when one of the reactants has been used up. Alkaline batteries are non-rechargeable. |
|
Why do re-chargeable cells and batteries stop working? Students handle hydrogen powered cars |
|
|
|
Rechargeable cells and batteries can be recharged because the chemical reactions are reversed when an external electrical current is supplied. |
|
How can re-chargeable cells and batteries be re-charged? |
|
|
|
Students should be able to interpret data for relative reactivity of different metals and evaluate the use of cells. |
|
Which cell would be the best choice to use to power a machine? Cell A produces 0.01V of energy and cell B produces 0.20V of energy. Give a reason for your answer. |
|
|
|
Students do not need to know details of cells and batteries other than those specified. |
|
What type of batteries are non-rechargeable? |
|
|
|
Fuel cells are supplied by an external source of fuel (eg hydrogen) and oxygen or air. The fuel is oxidised electrochemically within the fuel cell to produce a potential difference. |
|
How do fuel cells produce a potential difference? |
|
|
|
The overall reaction in a hydrogen fuel cell involves the oxidation of hydrogen to produce water. |
|
What sort of reaction occurs in a hydrogen fuel cell? |
|
|
|
Hydrogen fuel cells offer a potential alternative to rechargeable cells and batteries. |
|
What do hydrogen fuel cells offer alternatives to? |
|
|
|
Students should be able to evaluate the use of hydrogen fuel cells in comparison with rechargeable cells and batteries |
|
What are the advantages and disadvantages of using hydrogen fuel cells compared with rechargeable cells and batteries? |
|
|
|
Students should be able to write the half equations for the electrode reactions in the hydrogen fuel cell. (HT only) |
|
(HT only) What are the half equations for the electrode reactions in a hydrogen fuel cell? |
|
|