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To investigate how different amount of moler concentration of glucose affects the length of a small potato chip.

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Aim: to investigate how different amount of moler concentration of glucose affects the length of a small potato chip. Background information= osmosis is the net movement of water molecules (weak solution) from a region of high water concentration, through a semi permeable membrane to a region of low water concentration. A semi permeable membrane is a thin layer with pores surrounding a plat or animal cell and it is also known as a cell membrane because the pores sure tiny, only small molecules are allowed to pass through. Osmosis is when high concentrations moves to a low concentration. This movement of water molecules can occur in both directions, there maybe more movement out of the cell; sometimes the net movement will be balanced. However water molecules tend to move from one direction to another inside and outside of the cell. The movement of the water will affect the cell in different ways. If the concentration of water outside the cell is greater, more water will move into the cell and causes the potato chip to swell up (increase in size). Alternatively if the concentration of water outside the cell is lower the water will move out of the cell causing it to shrink and decrease in size. ...read more.


All the potato chips will be in the solution for the same amount of time. P4b List of equipment Potato chipper Knife Tubes Tube Rack Tile Potato Distilled water Ruler Measuring cylinder Masking tape Glucose solution Siv Paper towel P6a Prediction and theory My predictions are as you decrease the glucose concentration the size of the potato will increase. As you increase the glucose in the solution the water concentration will decrease. This means the water concentration is higher inside the potato therefore water will diffuse across the cell membrane of the potato into the solution. This will cause the potato to shrink. When the potato shrinks we say it has become flaccid and if the water concentration is greater outside the potato the water will diffuse into the potato causing it to become (turgid) an increase in size. P6b Number of readings and appropriate range In conducting this experiment I will use a range of at least five different concentration and at least 2 readings to show I repeated the experiment. I took 2 readings and this gave me the average change in length and average percent change in length. ...read more.


A4b Pattern or trend As the morelaritie of the glucose solution increases, the length of the potato chip decreases. A6b Conclusion From my graph I discovered that the more volume of glucose decreases my initial length and the more volume of water increases my initial length. And I also found out that 30ml of water and 10ml of glucose has no change at all (No change in initial length, final length). I also found out how to work out my average change in length (percentage change in length x 2= answer / 2) A6b conclusion and scientific theory I discovered that if a cell is placed in a strong solution the potato chip will shrink and if the cell is in a weak solution the potato chip would grow. But if the cell is in the same concentration the potato chip will stay the same size. The movement of water depends on the differences in water concentration on either side of the semi permeable membrane because there is a greater water concentration inside the chips in the strong solution; the chips have lost water causing it to decrease in length. If there is weaker water concentration inside the chips in the weak solution, this will cause the chips to gain water and increase in size. A8a Detailed scientific knowledge to explain conclusion ...read more.

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