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Test Upload

by: Anna Howard

Test Upload Test 101

Anna Howard

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About this Document

These are the test upload materials.
Test Webinar Session
Michaela Humby
Study Guide
50 ?




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Popular in Webinar

This 2 page Study Guide was uploaded by Anna Howard on Thursday August 25, 2016. The Study Guide belongs to Test 101 at Boston University taught by Michaela Humby in Fall 2016. Since its upload, it has received 2 views. For similar materials see Test Webinar Session in Webinar at Boston University.


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Date Created: 08/25/16
Criterion D DCP CE Achievement level awarded 5 4 Achievement of aspects c, p, c p, c, p Assessment Design Not assessed. The teacher decided not to assess this criterion having given the students a  lot of guidance on the method to be used. Data collection and processing Recording raw data Complete  The correct data is recorded. Processing raw data Partial  Raw data has been appropriately processed. The isotonic molarity can be calculated from  the intercept of the trend lines with the x­axis and then converted to solute potential using the graph provided. However, as the computer­drawn graph has no graduations included  on the axes or gridlines to determine the intercept points accurately, only a partial can be  awarded. Presenting processed data Complete Good use of trend lines to reveal the uncertainties in the data and some conventions for  graph drawing are respected. Conclusion and evaluation Concluding Partial The conclusion is partially correct. The water potential of the plant tissues may be due to  the presence of sucrose but there are other solutes that will be present in the cell sap. Evaluating procedure(s) Complete Errors due to the precision of the balance are discussed. As the degree of precision of the  balance is ± 0.1 g (given in the data) this is a valid criticism as the change in mass is 0.6 g at the most. Drying off the residual solution at the end is also a valid source of error. This aspect achieves complete. Improving the investigation Partial Not drying off the tissue cores after soaking would be a bad idea, it would probably lead  to a large source error. Cutting and weighing extra tissue samples would not have taken a  lot of extra time. This aspect only achieves partial.


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