Chemistry Galvanic Cell

1634 Words Jan 31st, 2013 7 Pages
Stage 2 Chemistry

Investigation Folio: Practical – Galvanic Cell

Name: YY
Names of Partner: ZZ

Part A

Investigation Design Proposal:

Purpose of Experiment:
To determine the effect of concentration of reactants on the current produced by a galvanic cell.

The greater the concentration of solution in the two half cells reacting with the two metals to produce current, the greater the flow of current will be produced from the galvanic cell.

Independent Variable:
Concentration of both reactants (Zn2+ and Cu2+).

How the Independent Variable is changed:
Changed by diluting the 1 mol L-1 (Zn2+ and Cu2+) solution supplied with distilled water, while keeping a constant volume.

Dependent Variable:
Current flow produced
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Keeping the salt bridge at the same length for each experiment could have improved the results from each testing, as wet equipment could have had an effect on the concentration level of the different experiments creating errors within the experiment.

The experiment showed that an increased concentration did increase the amount of current flowing through the circuit. This verifies that the hypothesis was valid for the experiment. Although taking into acocunt that there is not evidence to suggest an accurate relationship between the concentration and flow of current.

This experiment is a good example of how redox reactions work and how you can increase or slow down a reaction.

Two pictures of the experimental set-up followed (Labeled Figure 1 and Figure 2)

Performance Standards for Stage 2 Chemistry

| |Investigation |Analysis and Evaluation |Application |Knowledge and Understanding |
|B |Designs well-considered and clear |Clearly and logically analyses data and |Applies chemistry concepts and evidence|Demonstrates some depth and breadth |
| |chemistry investigations. |their connections with concepts to |from investigations to suggest |of knowledge and understanding of a |
| |Logically selects and appropriately |formulate consistent conclusions and make |solutions to problems in new
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