Science Coursework

Hypothesis: As you increase the concentration of the sugar solution, both the mass and length of the vegetable will decrease, therefore decreasing the amount of Osmosis activity.

Concentration: Is Osmosis affected by the concentration of dissolved substances?

Prelimanery 1 which plant cells are the best to use?

Aim: To find out which are the best plant cells to use.

Equipment:

Scale to measure the weight of the vegetable,this is needed to record the difference the osmosis makes; they measure vegetables accurately to atleast two decimal places.

Test tubes to store the vegetables and solution in; we do this to test osmosis within the test tube, they are perfect as tehy are big enough and clear.

Solution to test the vegatables and to decide in which direction osmosis travelled.

Test tube racks to hold the test tubes whilst noting down data.

Carrots, turnip, potato, parsnips to test the osmosis on as these vegetables had a semi-permeable membrane to allow concentration through, these make the expirement reliable.

Twizzers to carry and place the vegetables and results table to work out the difference of the weight so we can have factual data of osmosis and evaluate it.

Method

1. We got our equipment and vegetables which included; Scale, test tubes, solution, vegetables, test tube holder and twizzers and brang it to our table.

2.

Method We cut our eight vegetables to equal sizes we then weighed them all and recorded the weights on the results table and then we put each vegetable in to their own independent test tube, there were eight test tubes. We then covered them by solution (sucose) and left them there for 10 minutes so the process of osmosis can take place. We then reweighed them on the scale and recorder the weight on the results table. We then calculated the difference in mass in grams from when we put it in solution and took it out of solution, we took these results away from eachother. We then divided out difference results by vegetable mass before and then times it by 100.

Describe data: Everything changed, most of them

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