(i)

Statement of the problem:

How does the distance between two metals in the electrochemical series affect the voltage produced in a cell?

(ii)

Manipulated variable: Pair of metals

Responding variable: Voltage of cell

Constant variable     :  Type of electrolyte

(iii)

Hypothesis:

The further apart the distance between two metals in the electrochemical series, the higher the voltage produced.

(iv)

Materials:

iron, zinc, magnesium, copper and aluminium strips; copper(II) sulphate solution

Apparatus:

voltmeter, beaker, sand paper and connecting wires

(v)

Procedure:

1.  A beaker is filled with copper(II) sulphate solution.

2.  The copper and magnesium strips are cleaned with sand paper.

3.  The strips are immersed into the solution and connected by wires

      to a voltmeter.

4.  The reading of the voltmeter is recorded.

5.  Steps 1 - 4 are repeated by replacing magnesium with zinc, iron and aluminium.

(vi)

Tabulation of data: