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Metal Corrosion (Chemisty Coursework - Written only) - page 1
Keywords: chemistry gcse coursework metal corrosion
By exploiit on 19/06/2010
Level: GCSE Key Stage 4 (Years 10-11)
Page Number: 1 of 3 pages: 1 2 3Problem:
Look inside many care engines, particularly where the battery is, and you will see that the metal around the battery is corroded. This happens when the acid leaks from the battery and reacts with the metal body which is an alloy made mainly from magnesium.
Investigation:
An experiment was carried out to find the effect of temperature on the rate of this metal corrosion. The temperature ranges chosen were from 10-60° at 10° intervals. Each experiment was carried out twice.
Method:
Strips of magnesium were cut to a length of 5cm using a ruler and scissors. 25cm3
Of 2M H2 SO4 was measured out for each strip using a measuring cylinder. Each 25cm of soltuion was transferred to a conical flask.
The conical flask was heated or cooled to the appropriate temperature; the Magnesium strips where then added to the conical flask and the stop clock started. The experiment was considered over when the magnesium disappeared. For each experiment the time taken for the magnesium to disappear was recorded in seconds.
Prediction:
Using you scientific knowledge predict what should have happened in this experiment and why it happened.
I predict that as I increase the temperature, the rate of reaction will also increase. This means that for every 10°C, the rate of reaction will double. This is due to the collision theory, whereby particles muct collide in order for a reaction to occur.
When I increase temperature, the particles will gain energy. As they do so, they move more rapidly and begin to collide with other particles. This means that within a given time, more collisions will occur and because the particles have gained more energy, these collision will be of a greater energy. As there are more collisions, it is inevitable that more successful collisions will occur. These ‘successful’ collisions contain energy which is equal to or greater than that of the activation energy.
You will now be given the average results for this experiment. Using these, draw the appropriate graph/graphs and complete the accompanying worksheet in order to interpret and evaluate the experiment.
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SKILL AREA I
Interpreting and Evaluating
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Interpreting:
What do you conclude from the trend in these results?
My final results and graphs seem to suggest that as I increased the temperature, so too did the rate of reaction increase. For example at 60°C the time taken for the magnesium to fully disappear was 0.125sec 1, compared to 0.02sec 1 for 20°C. This means that temperature is directly proportional to the rate
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