The results could be useful to people who design drug delivery patches
They will know thatas the concentration increases the rate of diffusion increases
If they put a high concentration of drug into a patch the difference in in concentration is greater so the rate of diffusion is faster
This would be good for painkiller
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Sketch Graphs
Independent variable on the x axis.
Dependent variable on the y axis.
Boths axis need titles and units.
Do NOT draw points, only draw a line of best fit.
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Case Studies
Include data
Check if the experiment has been repeated
Look out for anomalies - have they been included in the mean?
Is there a different independent variable?
Possitive or negative correlation
Is the effext proportional?
Does the effect level out? (E.g. a curved line like limiting factors in photosynthesis)
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Suggest why others might get different results
They may have used a different method
For example they could have used different values for their control variables.
Also, they may have used a stronger alkali in the agar cubes which would have made the time taken for the cube to go colourless longer
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Anomalous Results
Yes I did get anomalous results
They were at 0.4M and 0.6M
They are not close to the line of best fit and do not follow the pattern
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Independent Variable & Range
Independent Variable - Concentration of acid
Range - 0.2M to 1.0M
This was a suitble range because there was a difference between the lowest concentration (0.2M) and the highest (1.0M)
So my results agree with my hypothesis
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Repeated Readings
Discard anomalous results
Add the results together
Divide the sum by how many results there are
This is how a mean value is calculated
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Supporting The Hypothesis
Yes my results do support my hypothesis
As concentration of acid increases the rate of diffusion increases. The effect is less at higher concentrations
For example, with 0.2M of acid the time taken to decolourise was 231 seconds, whereas when this was increased to 1.0M the tim take to decolourise was only 117 seconds
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Uncertainties
Difficult to decide when all the colour has gone
Use the same person to judge the end point
This will reduce random errorsand allows you to directly compare the cubes
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Reproducible
Compare with others who used the same independent variable
Compare to see if they are similar
If they are similar then the results are reproducible
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