Osmosis Investigation
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Introduction Osmosis is defined as the diffusion of water molecules, down a water potential gradient, across a partially permeable membrane. If the solutions on each side of the partially permeable membrane are equally concentrated then there will be no net movement of water across the membrane. If the solution outside the cell has a low concentration of solute, this causes cells to become turgid as water flows into them, or if the solution outside the cell is of high concentration the cells become plasmolysed as the water flows out. Aim The aim of this investigation is to...
Use a wider range of sucrose solutions.
Use a wider range of sucrose solutions.
?é?À When the potato was dried to remove surface liquid it was not necessarily done the same on each potato, allowing some to weigh more.
?é?À Although the osmotic potential for this investigation was estimated, a more scientific approach would have been better.
?é?À Selecting a better root vegetable to see how the results differ.
These points can all be taken into consideration for a re- test, but I believe this experiment went well and we obtained the results that proved my hypothesis and prediction.
Method Ten 50ml beakers were labelled accordingly, e.g. 2 x 0m, 2 x 0.25m, 2 x 0.5, 2 x 0.75 m and 2 x 1m. Distilled water and sugar solution were then measured to vary sugar concentration, into beakers using a pipette. Using a size 4 core borer, sections...
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Trans Fatty Acids and Heart Disease Heart disease is the number one cause of death for North American men and women. In fact, each year more middle -age and older women die from cardiovascular diseasethan breast cancer. The good news is that the risk of heart disease can be greatly reduced...
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Prediction I predict that the more catalase used will speed up the reaction rate between the catalase and hydrogen peroxide. On a graph, as the concentration of catalase is increased the rate of reaction will increase forming a series of positively correlated lines, increasing in gradient as the catalase...
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The digestive system is used to break down the food that we eat. It is made up of many different organs like the oesophagus, stomach, intestines etc?óÔé¼?ª Digestion starts when food is taken into the mouth. This is called ingestion. The teeth are used to break the food into...
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The Respiratory System Organs involved are lungs, capillaries The body requires oxygen to survive as it feeds muscles, tissues, and organs. The air we inhale breathe in into our bodied consists of: GAS AIR INHALED AIR EXHALED Oxygen 21% 16% Carbon Dioxide 0.04% 4% ...
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