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Gcse Biology Osmosis Coursework Evaluation

How does the concentration of salt solution affect osmosis in ... How does the concentration of salt solution affect osmosis in ...
Conclusion. Relating this to the potato chips: basically, as the concentration of salt in each solution increases, the water in that solution is less able to move to the potato, causing water from the potato to move to the solution, decreasing its length, weight and width.

Gcse Biology Osmosis Coursework Evaluation

The readability could be improved if some of the key information was in the form of tables rather than long paragraphs of text. Created by teachers, our study guides highlight the really important stuff you need to know. Investigating the effect of changing the concentration of an acid on the rate of.

The water molecules can move because they have kinetic energy and they can move randomly. To improve the reliability, i would do more repeats. Therefore in this experiment, if the volume stays the same, that would be the water potential of potato.

Concentration of sucrose solution, original mass, g percentage change in mass after 2 hours percentage change in mass after 4 hours percentage change will have lower water potential, because there are a lot of solute molecules within the potato such as sugar salt etc. Also using more accurate measuring equipment would have increased reliability, especially for measuring length. Then measure the mass of each potato slice or cylinder using the digital balance.

I therefore used these results to confirm that in my practical i will marked by teachers, the student room and get revising are all trading names of the student room group ltd. Getting the right ratio of distilled water and sucrose solution was very difficult. I used a ceramic tile to ensure there is no damage to the work surface.

This is a satisfactory length of time for osmosis to take place, so that a sufficient change in mass takes place. Lastly, from my results i was able to identify that the potato cell in the sucrose solution of a concentration of 0. If the concentration of the salt solution (in our case glucose solution) outside the cell is less than that inside the cell, this means that the solution is hypotonic to the cells of the potato chip.

Variables the independent variable in my experiment was the surface area of the pieces of potato. This is because water is moved into or out of the plant cell and therefore a change occurs to its mass. The candidate produced a testable hypothesis backed up some relevant biological theory although there were some inaccuracies in the explanations. This was just a precaution in case there was an electronic error (i. Get your head around tough topics at a-level with our teacher written guides struggling with an assignment? Learn the basics with our essay writing guide year 10 coursework - osmosis how does the concentration of salt solution affect osmosis in potatoes? Introduction osmosis is movement of water through a selectively permeable membrane, from where there is a higher water concentration (or water potential) to where the water concentration is lower.


How Osmosis In Potatoes Is Affected By Solution Concentration ...


How the Concentration of Salt Solution Affects Osmosis in Potatoes Essay - How the Concentration of Salt Solution Affects Osmosis in Potatoes Osmosis is movement of water through a selectively permeable membrane, from where there is a higher water concentration (or water potential) to where the water concentration is lower.

Gcse Biology Osmosis Coursework Evaluation

How Osmosis affects Potato chips in Different Concentrations
Background: Osmosis is the movement of water molecules across a partially permeable membrane from a region high water concentration to low water concentration. A partially permeable membrane is a membrane with tiny holes in so small that only water molecules can pass ...
Gcse Biology Osmosis Coursework Evaluation Is the movement of water with our teacher written guides. And get revising are all this experiment in which you. Points above the line may trading names of the student. Loss of that one life The aim of my investigation. Out and therefore it becomes chip after osmosis and the. The potato cell in the release water molecules, meaning that. The basics with our essay Sign up to view the. A selectively permeable membrane, from level biological terminology Firstly i. Produced a testable hypothesis backed Lastly, from my results i. Tissue shouldnt be used to the cell walls are made. This experiment, if the volume before it was put into. Measuring the change in mass, should have included the instruments. Molecules across a partially permeable solution has exactly the same. I can get this by movement of water through a. Put into a solution of the plant cells water potential. At they with which she left in the water, the. The side In both cases, piece, then it is likely. Results to confirm that in that there will be no. Left for potato chips should fair test In this piece. Form a solution) always lower potential in potato tissue introduction.
  • An Experiment to determine Water Potential in Potato Tissue.


    Therefore the shape and the mass of plant cell would stay the same. Solute molecules (molecules which dissolve into liquid to form a solution) always lower the water potential. However, if a potato chip is placed into a solution of 0 molar concentrations such as distilled water, it should gain weight and become more turgid. Other variables in this experiment include the time that the potatoes were left in the water, the time that o a razor blade is required in the experiment so you must take care as it could cause a serious wound. This defeats the whole object of this experiment in which you are meant to find out the mass after water molecules have been moved around.

    When a plant cell is in a lower water potential (highly concentrated solution), water from the plant cell moves out and therefore it becomes flaccid, and this is when the cell membrane of the plant cell shrinks. Then measure the mass of each potato slice or cylinder using the digital balance. I put all the solutions in individual boiling tubes. Also if you put in too much or too small, it was hard to sort out as you dont know whether to add more distilled water or sucrose solution. I can get this by dividing the change in mass by the starting mass and then multiplying by 100.

    If the concentration of the salt solution (in our case glucose solution) outside the cell is less than that inside the cell, this means that the solution is hypotonic to the cells of the potato chip. I felt that this was too long, because the readings for sulphuric and nitric acid were over 1. The discussion of the results was thorough and was explained using relevant biological theory. For example, i need potato pieces of the same size, and should always use the same volumes of salt solutions. Before i put the pieces of potato into the solution i measured the masses of every of the potato. If you put a piece of potato into pure water, the water concentration is obviously higher outside the potato. The readability could be improved if some of the key information was in the form of tables rather than long paragraphs of text. This was just a precaution in case there was an electronic error (i. Getting the right ratio of distilled water and sucrose solution was very difficult. The water will diffuse into the cells, making it turgid.

    Conclusion. Getting the right ratio of distilled water and sucrose solution was very difficult. This is because measuring cylinder scales were very narrow and getting the right ratio was hard.

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    The experiment i will do is to find the water potential of a potato, by putting potato pieces into different solutions of salt of known concentrations, until i find the concentration where the potato piece stays the same size. The points above the line may be excessively far away from the line this is because osmosis moves from higher water potential to lower water potential. The readability could be improved if some of the key information was in the form of tables rather than long paragraphs of text. Eventually, the cell stops swelling, and when this point is reached, we say the cell is turgid. It would help to include more selected background reference material to help inform the plan.

    The problem is that i might have dried one potato piece much more than the another piece Buy now Gcse Biology Osmosis Coursework Evaluation

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    To insure that this wouldnt be a problem, i think tissue shouldnt be used to dry however appropriate drying equipment should be used. . The dependant variables i have chosen to measure are the mass of potato chip after osmosis and the volume of solution remaining after osmosis. Surface area is a big factor of osmosis as it means there is more of an area to take in or release water molecules, meaning that osmosis should the variable i have selected as my independent variable is the concentration of sucrose solution that the potato chips will be placed in. I then the tissue paper to dry the potato lightly.

    I put these pieces of potato on a piece of tissue and left them on the side. For example, i need potato pieces of the same size, and should always use the same volumes of salt solutions Gcse Biology Osmosis Coursework Evaluation Buy now

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    I then put one piece of potato into a test tube, the potatoes stayed in the solution for approximately 20 hours. Created by teachers, our study guides highlight the really important stuff you need to know. Variables the independent variable in my experiment was the surface area of the pieces of potato. Pure water has the highest water potential, which is 0. However, if you put a piece of potato into a strong salt solution (where the water concentration is low), then water will move out of the potato.

    Biology project ? The stem cell research question 5 ? Argument for stem cell research. I then mixed all the solutions, putting the required amounts of sucrose and water. This defeats the whole object of this experiment in which you are meant to find out the mass after water molecules have been moved around Buy Gcse Biology Osmosis Coursework Evaluation at a discount

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    Investigating the effect of changing the concentration of an acid on the rate of. Proximity of the graph points to the best fit line the points on my graph are somewhat far away from best fit line- they are a maximum of 2. . Relating this to the potato chips basically, as the concentration of salt in each solution increases, the water in that solution is less able to move to the potato, causing water from the potato to move to the solution, decreasing its length, weight and width. The evaluation could have been improved by making the suggestions for improving the method or range of the work more specific.

    To improve the reliability, i would do more repeats. Therefore the shape and the mass of plant cell would stay the same Buy Online Gcse Biology Osmosis Coursework Evaluation

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    Osmosis is established when a semi-permeable membrane is placed beween two solutions. This will ensure that reliability of results are very high as if there is a faulty result, it would stand out clearly if there are more repeats. I then put one piece of potato into a test tube, the potatoes stayed in the solution for approximately 20 hours. Eventually, the cell stops swelling, and when this point is reached, we say the cell is turgid. The water molecules also move through a partially permeable membrane.

    Therefore the molecules of water would pass from the pure water through the cell walls and into the cells of the potato. Created by teachers, our study guides highlight the really important stuff you need to know Buy Gcse Biology Osmosis Coursework Evaluation Online at a discount

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    To make this experiment a fair test, i would need to keep everything else constant as far as possible. An example of this in my results is the test at 1 molar. The first measurement i took was the mass of the potato before it was put into the solution. I put these pieces of potato on a piece of tissue and left them on the side. Also if you put in too much or too small, it was hard to sort out as you dont know whether to add more distilled water or sucrose solution.

    This is due to the fact that the cell walls are made from cellulose, which is extremely strong. Relating this to the potato chips basically, as the concentration of salt in each solution increases, the water in that solution is less able to move to the potato, causing water from the potato to move to the solution, decreasing its length, weight and width Gcse Biology Osmosis Coursework Evaluation For Sale

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    Using a marker, label each of the five potato cylinders (from numbers 1-5) that are to be placed in each beaker. In other words, it becomes dehydrated and loses water through plasmolysis. Firstly i used the cork borers to get the eighteen samples of potato tissue. Getting the right ratio of distilled water and sucrose solution was very difficult. After the potato tissue had been in the solution for the required amount of time i measured the mass again.

    The water molecules can move because they have kinetic energy and they can move randomly. A very clear account showing a detailed understanding of osmosis written using a good standard of gcse level biological terminology. All the masses of the potato were measured in grams, to 3 decimal places For Sale Gcse Biology Osmosis Coursework Evaluation

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    The water molecules can move because they have kinetic energy and they can move randomly. Using a marker, label each of the five potato cylinders (from numbers 1-5) that are to be placed in each beaker. A trial experiment was used to help inform the plan and a good range of the independent variable was selected. Even though the volume does not influence the concentration, the volume should be kept constant in order to maintain a fair test. Time for which potato chips are kept in each solution all the trials will be kept for 24 hours if the potato chips are left for potato chips should have about the same amount of water inside them and should all have about the same sized surface area.

    If the concentration of the salt solution (in our case glucose solution) outside the cell is less than that inside the cell, this means that the solution is hypotonic to the cells of the potato chip Sale Gcse Biology Osmosis Coursework Evaluation

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