... water molecules will transfer over to the stronger solution. Thus materializing osmosis. Fair test: To create a fair test certain aspects of the experiment were kept the same whilst one key variable was changed. It was chosen to vary the concentration ...

... nor decrease will be in the correct Petri dish that will have the solution that is exact the same concentration of the cell sap in a potato. Apparatus; · 7 Petri dishes - for all of the seven solutions · Beakers - ...

... why we weighed the chips with a digital scale, which measured up to two decimal places. Valid Evidence To ensure that a valid test is carried out in this test, so that all the values are accurate, there are a few ...

... also predict that the water will move out of the potato tissue in the 2M solution, and the potato will lose weight. As the sugar solutions get stronger, the potato will begin to lose more weight. At the point where ...

... the semi-permeable membrane are equally distributed, with all areas having an equal concentration. Plant cells always have a strong cell wall surrounding them. When they take up water via osmosis they start to swell, but the cell wall prevents them from ...

... reaction will speed up but the enzymes active site will change shape so the enzyme and the partial do not fit in just right like this The enzyme at optimum: just above: far above and eventually the enzymes will denature. To find ...

... prevent other things from passing through. Cell membranes allow molecules like oxygen, water, carbon dioxide, glucose, etc. to pass through. A region of high concentration of water is either a very dilute solution of something like sucrose to pure water. In ...

... water molecules pass from an area of high sugar concentration, i.e. in the water itself, to an area of low concentration, i.e. in the potato chip. Therefore, the chips in higher water concentrations will have a larger mass than in ...

... temperature is constant through each part of the experiment. * Salt solution: A varied amount of different molar salt soltion-0.0m, 0.3m, 0.5m, 0.7m, 1.0m * Electric scales to measure the weight of each piece of potato before and after the experiment to ...

... Measuring Cylinder * Boiling Tube Rack * Potato Corer * Tweezers * Pipettes * Top Pan Balances * Distilled Water * 0.2, 0.4, 0.6, 0.8, 1.0 molar sugar solutions Method: * Collect equipment * Set up * Get your potato and place on a white tile. Using a corer ...

... is in contact with the hydrogen peroxide. I also kept the concentration of the hydrogen peroxide constant at 2 molar. The amount of hydrogen peroxide was kept constant. In addition, the time in which they were left for was kept ...

... increase the rate of reactions without being used up in the reaction themselves. When we analyse rates of reaction we can see that the amount of oxygen made increases as we add higher concentration. However, eventually the rate of reaction ...

... increase the rate of reactions without being used up in the reaction themselves. When we analyse rates of reaction we can see that the amount of oxygen made increases as we add higher concentration. However, eventually the rate of reaction ...

... in the body. The formula for this is: Catalase Hydrogen peroxide oxygen + water Hydrogen peroxide = Water + Oxygen 2H2O2 2H2O O2 The investigation I have been asked to investigate the factors that can affect the rate of an enzyme. I think ...

... my results for, it will not be a fair test. For instance if one of the potato chips was 1cm longer the surface area of the chip would be larger and there would therefore be more space for osmosis to ...

... surface area the quicker the reaction is because of a theory called the 'Lock and Key' theory. This theory explains how each enzyme has its own specificity to split up a substrate that fits into the enzyme, (this is the ...

... leave the chips for approximately one hour in the solutions. I will record their mass in kilograms to 2 decimal places and length in centimetres to 2 decimal places also. I will have six different concentrations of solutions and place ...

... advantage of using the cell vacuole as a storage organ is that the concentration of solutes in the cytoplasm can be kept within levels that allow the cell to function best. Water entering a cell then has to pass through ...

... same time allowance so the enzyme and substrate have the same amount of time in each experiment to react. I will test each temperature three times thus making anonymous readings prominent. I will wash out all apparatus after use to ...

... at which enzyme work. If the solution, is too acidic or too alkaline from what the enzyme is used to working in, then enzymes will be denatured. This means that the enzyme will not be able to react with the ...

... and 4mm in length. The longer the potato is in the solution, the more the mass will rise until all the solution is absorbed into the potato. Method * I took 3 potatoes and labelled them A, B & C * From ...

... Measure out 5g of potato. 2. Crush potato with pestle and mortar. 3. Set up Bunsen burner, gauze, tripod and heat proof mat. 4. Fill beaker with 200ml's of water and place on top of tripod. 5. Measure out 5 ml's of Hydrogen Peroxide ...

... problems (5). Scientists take a beta-carotene production gene from carrot plants, and transfer it into rice plants (4). Human bodies are able to turn the resulting beta-carotene into vitamin A (5). 3. a) Rosalind Franklin used x-ray crystallography to investigate the ...

... don't know how a sick kind of person who calls itself a "human being" can lock up a tormented chicken and then dose off to a warm and cosy bed. How would the farmer like it if it was locked ...

... and Function of an Enzyme Enzymes are large proteins that speed up chemical reactions. In their globular structure, one or more polypeptide chains twist and fold, bringing together a small number of amino acids to form the active site, or the ...