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BEETROOT COURSEWORK - temperature or ethanol concentration Free essay! Download now

Home > GCSE > Biology > BEETROOT COURSEWORK - temperature or ethanol concentration

BEETROOT COURSEWORK - temperature or ethanol concentration

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Downloads to date: N/A | Words: 1020 | Submitted: 31-Mar-2011
Spelling accuracy: 96.8% | Number of pages: 3 | Filetype: Word .doc


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BEETROOT COURSEWORK - temperature or ethanol concentration essay previewBEETROOT COURSEWORK - temperature or ethanol concentration essay previewBEETROOT COURSEWORK - temperature or ethanol concentration essay preview

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BEETROOT COURSEWORK - temperature or ethanol concentration

Preview

BEETROOT COURSEWORK
- temperature or ethanol concentration -

PLANNING:

The independent variable is the factor that you control. Thus you need to include full details of how you set about ensuring that the values you state are as accurate and reliable as possible.

So:
Temperature – use water-baths and measure the actual temperature
allow enough time for the ‘ingredients’ to reach the indicated temperature – state in minutes how long. NB ‘Room Temperature’ does not exist in AS coursework – but you can use a water-bath with tap-water, by all means…..
Volume - what volumes of liquids are you going to use? Why? How are you going to measure them? Why?
Beetroot - How much are you going to use? Why? How are you going to cut them? Why? Is the beetroot uniform? How are you going to randomise your beetroot disks? What about genetic / growing / storage variations in the beetroot?
Reaction vessels - What are you going to react the beetroot in? Why?
Time - How long are you going to react the beetroot for? Why did you choose this time? How are you going to measure it? How are you going to ensure each replicate is the same?
Range - what range of readings are you going to take? How did you decide on this? Will it be sufficient for a reliable result?
Concentration - Range sufficient? Why chose this?
Control - This will, of course, be part of the range of results taken, and so no separate control will be needed.

The dependent variable is the one you measure.

So:
Absorbance - What are you going to measure this with? Why did you decide to use a Harris Digital Colorimeter, set up using filter 5 (yellow-green, peak absorbance at 550 nm)? How to you propose to calibrate it? What is the volume you use in each cuvette? How will you measure this?
Replicates - How many readings are you going to generate per set of results? Clearly, you realise that the minimum is going to be 5. How many replicates are you intending to use? Can you combine your results with any other groups? Are you going to average them? Why?

DIAGRAM:
Have you done one? In pencil? Labelled?

COLLECTION OF DATA
Do ensure that you have collected your data on a decent bit of paper! These results need to be included in your final submission (as an appendix), as well as the neat, fully titled, word-processed table(s) in the ‘Results’ section of your report.
Ensure your results are taken to an appropriate degree of accuracy and that you have enough in each set (min 5) ...

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