... have created a table to make it easier to see the best variables to select for the investigation: Variable Easy to Change in Lab Easy to Measure I can get at least five results I can explain the science Change in mass Yes Yes Yes Yes Change in volume Yes Yes Yes Yes Change in Length Yes Yes Yes Yes Concentration ...

... chipper, 12 squares of potatoes with a mass of 2.0g each, I am going to use a chipper for this so that the potatoes will have an almost identical surface area this will mean that the extent to which osmosis ...

... the strength of the sugar solution. In my experiment, I predict that potato cylinders placed in a sugar solution higher than 0.5m will gain more weight than those placed in a solution of less than 0.5m. I think this because ...

... 'perfect' environment). In the case of the onion cells, when placed with a drop of water, after 15 minutes, the cell had a turgid, or swollen, appearance under the microscope and felt fairly strong and sturdy, as the water was diffused ...

... keep the same in each individual experiment to keep it a fair test is to keep the same sizes of each potato tissue the same by using the same cork borer and same ruler. I will be keeping the same ...

... it a fair test is to keep the same sizes of each potato, the same by using the same cork borer and will try to keep the weight similar. I will be keeping the same amount of solution placed in ...

... exchanged although the water will continue to move around. I think that, when placed into a solution of high salt concentration, the potatoes cut into the shape of French fries will decrease in weight. I predict that the higher the ...

... concentration (the cells.) As more and more water enters the cell the cell wall starts to expand and the cell starts to become turgid. Even is a plant cell is placed in a solution where there is a high water concentration ...

... another solution. A dilute solution, with its high proportion of free water molecules is said to have a higher water potential than a concentrated solution, because water will flow from the dilute to the concentrated solution (high water potential to ...

... that could affect my experiment. But, there are some: * As there are no two identical potatoes anywhere in the world, it would be hard to try to equal the glucose concentration of the two chips taken from different potatoes. ...

... will also have more energy so more catalase will be successful so therefore there will be more oxygen produced. It is for this reason that temperature in my investigation must be controlled. If the temperature is not controlled then the oxygen ...

... water by osmosis and become "flaccid". When plant cells lose more water than they take up the cells become flaccid and this causes the plant to wilt. In extreme cases the solution that a plant cell is placed in, ...

... but the enzyme is not changed. It can then go on to be used again to catalyse other reactions. The experiment that I will be completing involves using hydrogen peroxide as the substrate and catalase as the enzyme. Catalase is ...

... Preliminary work For my GCSE biology coursework I did a small investigation into the water potential of a potato. I found that when the solution was dilute, the potato tube became turgid, and had therefore gained water molecules. When the solution ...

... glucose will have become starch. I think there will be enough un-converted glucose for osmosis to have an effect. Using my knowledge of osmosis, and the chemical makeup of a potato, I think the water potential will lie below ?0.5, ...

... to become flaccid and, eventually, plasmolysed, making the potatoes squashy and undesirable to the customers of the shop. Prediction: My prediction is that the more sea water comes into contact with the potatoes, the more soft and squashy the potatoes will become. ...

... mass is bigger and there is more water in the potato this would make my test unfair and upset my results. This is one of the most important variables. To ensure it is a fair test I will cut the ...

... tube * Hydrogen Oxide (H2O) * Hydrogen Peroxide (H2O2) * Ice cubes * Measuring cylinder * Pipette * Potato * Rubber bung * Stop Watch * Test tube Variables: Dependant Variable: Time elapsed for the reaction Independent variable: Temperature of solution. Controlled Variable: Volume of Hydrogen Peroxide, concentration of Hydrogen Peroxide, volume of ...

... semi permeable membrane from a high concentration of water to a low concentration of water. Water moves from a high water potential to a low water potential. A low water potential is a high solute concentration. Water potential has the ...

... and length change of the potatoes placed in different molarities of sugar solutions. I will record the masses in grams by using a balance and the length changes by using a ruler. I will be measuring the mass of the ...

... going from a high concentration to a low concentration along a concentration gradient. The water moves out of the potato by osmosis going against a concentration gradient. Fair test I will make my experiment a fair test by using the same ...

... potential is measured in kilopascals (KPa). Water has a value of zero, because pure water can't absorb any more water molecules. All other solutions have a negative value, the stronger the solution the more negative the value. Osmosis happens everywhere, in ...

... potential is measured in kilopascals (KPa). Water has a value of zero, because pure water can't absorb any more water molecules. All other solutions have a negative value, the stronger the solution the more negative the value. Osmosis happens everywhere, in ...

... Builders: In other reactions large molecules are needed to be formed by small ones, builders enzymes speed up building these molecules from smaller ones which are important molecules inside cells. In Builder enzymes the product released is the built up substrate ...

... enzyme is said to be denatured and will no longer work. Certain things affect the reaction rate of a substance where an enzyme is used. The concentration of the reactant will affect the reaction rate. If there is a strong ...