Effect of surface area to volume ration on diffusion time in agar cubes

Write down any qualitative observations you see. The time between taking out the cubes from the solution and measuring can impact the results.

As the experiment progressed with the other block sizes I probably got better at making this judgement. V and diffusion rate look in a full spectrum, does it stay in the same trend as this experiment has shown or not.

Rinse the cubes in a little water and blot the surfaces of each cube dry with a paper towel. The smallest cube has a surface area to volume ratio of 6: If there is a large surface area to volume ratio, there is more cellular membrane to take care of both of these functions.

The graph appears to flatten off at the point of the cube with the dimensions 1,5cm x 1,5 cm x 1,5 cm and SA: By increasing the surface area the rate of diffusion will go up. More essays like this: It is important that cells have a large surface area to volume ratio so that they can get enough nutrients into the cell.

Some shapes have a larger surface area to volume ratio so the shape of the object can have an effect on the rate of diffusion. The concentration of carbon dioxide outside the cell is lower than the concentration in the cell so the carbon dioxide will always dissolve out of the cell.

Safety As NaOH is a corrosive acid that can cause chemical burns on skin and permanent blindness when contacted with eyes. Fill the beaker with hydrochloric acid and put the 1cm3 agar cube into the beaker, making sure to completely immerse the cube in the acid.

It took longer to reach the centre of the cube even though the rate of diffusion was the same for all the cubes. A small cradle could be used to suspend the blocks in the acid which would mean that all six sides of the cube should be in contact with the acid.

By increasing the surface area the rate of diffusion will go up. V gets smaller and there is not enough surface area to expel wastes or intake nutrients the cell has bigger volume so needs more of them fast enough and the cell shrinks or dies.

Second of all, it was already mentioned that the data collected by group number 6 is very different from the data collected by the other groups.

This also colourless substance is a commonly used indicator that changes its colour into pink with the presence of a base. The cell membrane is made up of a lipid bi-layer with many proteins integrated into it. However, in reality it is impossible to keep all the variables precisely the same.

In the future, we would systematically turn the cube throughout the 6 minutes to ensure each side had even exposure to diffusion.

I tried to keep all the variables except for the size of the gelatin blocks the same for all the experiments. Keeping the cubes in the solution much more or much less than 10 minutes has probably affected the results most significantly — the diffusion would be at a different stage.

The larger blocks have a smaller proportion of surface area than the smaller blocks. If you like this post please consider linking to it using this code: Limitations To help make this experiment more accurate, I repeated it three times for each block size and then used the average of all the results to plot a graph with a line of best fit.

The results for the 5 x 5 x 5 block ranged from 4. The acid took 48 minutes to diffuse to the centre of the largest block but only 1 minute in the smallest block.

Effect of size on uptake by diffusion

Gases will always dissolve from an area of high to low pressure. A block of bromothymol blue agar should be cut into the following sizes using the chopping board, knife and ruler: Smaller cubes have bigger SA: When the surface area to volume ratio goes down it takes longer for the hydrochloric acid to diffuse into the cube but if the ratio goes up then the hydrochloric acid diffuses more quickly into the block of gelatin.

They can increase their surface area by flattening and becoming longer or by having a rough surface with lots of folds of cell membrane known as villi.

Calculate surface area to volume ratio for cubes of different sizes and consider the problems faced by large organisms. Lesson organisation While the cubes are soaking, students can try the calculation of surface area to volume ratio for themselves.

Calculate surface area to volume ratio for cubes of different sizes and consider the problems faced by large organisms. Lesson organisation While the cubes are soaking, students can try the calculation of surface area to volume ratio for themselves.

The ratio of Surface Area: Volume decreased in value as the dimensions of the cube increased. 2. 3. to reduce the time for which it was exposed to the atmosphere. after some part of the cube has been made colourless. the relation between the ration & the time taken was negative which could represented with the following equation – “y = -2 1/5(1).

Diffusion in agar cubes Introduction: All cells are dependent on a processes called diffusion, which is the movement of a substance from an area of higher concentration to an area of lower concentration.

Cells need to obtain certain essential substances, like oxygen, for their survival.

Modelling Surface Area to Volume Ratio in Cells with Agar Cubes Essay Sample

When you increase surface area and volume of a cube, the volume increases more rapidly than the surface area.

This means that there is more volume for each unit of surface area. Therefore, it would take longer for substances to diffuse into the cell. Diffusion in agar cubes Introduction: All cells are dependent on a processes called diffusion, which is the movement of a substance from an area of higher concentration to an area of lower concentration.

Cells need to obtain certain essential substances, like oxygen, for their survival.

Effect of surface area to volume ration on diffusion time in agar cubes
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Effect of surface area and volume on the rate of diffusion by Hana Jawz on Prezi