such as methane‚ however‚ have weak cohesion due only to Van der Waals forces that operate by induced polarity in non-polar molecules. Cohesion‚ along with adhesion (attraction between unlike molecules)‚ helps explain phenomena such as meniscus‚ surface tension and capillary action. Mercury in a glass flask is a good example of the effects of the ratio between cohesive and adhesive forces. Because of its high cohesion and low adhesion to the glass‚ mercury does not spread out to cover the bottom
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Investigation into how pH levels affect Catalase activity in potato samples – (enzymes) Introduction: The aim of this investigation is to understand and monitor the effects pH levels have on catalase activity within controlled potato samples. Catalase is a type of enzyme that is found widespread among organisms that grow in the presence of oxygen (almost all living things) its specific use is to speed up the decomposition of Hydrogen peroxide (H2O2) within cells. Hydrogen peroxide is a bi-product
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Using dialysis tubing to model diffusion of a cell membrane and investigating the influence of solute concentration on osmosis Purpose * Discover how dialysis tubing diffuses the cell membrane * Explore the effect of solute concentration on osmosis Background A cell membrane is a very significant function in the human body. In one sense‚ it is used as a barrier to keep the enzymes‚ DNA‚ and metabolic pathways that bundles everything together. Cell membranes are also used as a gateway
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A potato battery is a type of electrochemical cell. An electrochemical cell converts chemical energy into electrical energy. In the potato battery‚ there is a transfer of electrons between the zinc coating the galvanized nail that will be inserted into the potato and the copper wire that will be inserted another part of the potato. The potato conducts electricity‚ yet keeps the zinc ions and copper ions separate‚ so that the electrons in the copper wire are forced to move (generate current). It’s
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Investigatory Project In Science & Technology IV (Potato Battery) Submitted by : Eloisa Umali Chelsea Jayne D. Diaz Pia Angela Valencia Acknowledgement The researchers would like to acknowledge with sincerest gratitude the following persons for the support they gave to them in the accomplishment of this investigatory project. Mrs. Rosie Castillo‚ who guide us and helped us in making this project. Who gave us the opportunity
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Osmosis and Water Potential Year 11 Emary Venter INTRODUCTION: The cell is the basic unit of living things‚ and is made up of multiple organelles. Organelles are membrane bound subdivisions‚ each specialised for a specific function. This experiment looks at the Plasma Membrane‚ which is a semipermeable layer surrounding the cell. It’s primary job is to control what goes in and out of the cell. Molecules can move across this membrane in either an active movement or a passive movement
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POTATO BATTERY Abstract a. Purpose To lessen the consume of electric charge b. Procedure We insert copper and zinc electrodes in to the potato‚ close but not touching each other. We use Clip leads to connect our electrodes to the Multimeter to measure voltage between two electrodes or current passing through the multimeter. For this experiment we removed the shell of a broken AA battery for our Zinc electrode. (Make sure to test your multimeter by connecting its Positive and Negative
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Experiment: Osmosis in Sucrose Solutions Abstract We used dialysis tubing to simulate a semi-permeable membrane. Since molecules diffuse from their higher concentration to their lower concentration‚ water will move across the membrane in response to this concentration. While conducting this lab we were able to observe passive transport through diffusion and osmosis. Introduction Osmosis is a specialized case of diffusion that involves the passive transport of water. When osmosis occurs
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The Measurement of the Rate of Osmosis by using “Deshelled” Chicken Eggs (Effect of Solute Concentration upon Rate/Degree of Osmosis in Chicken Eggs) Introduction Every cell needs a mechanism that it uses in the maintenance of a constant internal environment. This is important in the control of the ever changing external environment to the cell. The transfer of materials to and from the cell thus needs a very stable mechanism to achieve this status. Cells are therefore bound a membrane that acts
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How Surface Area Affects the Motion of a Falling Object Introduction During this investigation‚ varying surface areas of objects will be explored in a manner observing the motion as they fall. Most predominantly‚ this motion encircles speed. Speed is calculated from the formula below‚ and hence is directly proportionate to time taken when the distance travelled remains a constant. Speed = Distance/Time Surface area is likely to affect the time taken for an object to complete a descent‚ and
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