Essays Tagged: "semi permeable membrane"

Biology experiment on osmosis for gcse very good got an A* as course work so do not miss out

potatoes placed in different salt concentrationIntroduction:Osmosis is a movement of water across a semi-permeable membrane. This may only happen when there is a difference in concentration between th ... lution to pass through; only a few allow a selective flow. That is why I have chosen potatoes as my semi-permeable membrane.In osmosis, a solvent (often water) moves from a region of low concentration ...

(15 pages) 314 2 4.2 Mar/2002

Subjects: Science Essays > Biology > Plant Biology

"Experiment to investigate the effect of osmosis in potatoes" A GCSE experiment looking at the effects of the concentration of sucrose solution on osmosis in potato tubers.

hat osmosis is. Osmosis is the passage of water from a region of high water concentration through a semi permeable membrane to a region of low water concentration. This definition contains three impor ... ration. This definition contains three important statements:a) It is the passage of water through a semi permeable membraneb) It is the passage of water from a region of high water concentrationc) It ...

(11 pages) 191 1 4.7 Jan/2003

Subjects: Science Essays > Biology

Biology Coursework: The effects of Osmosis on a potato chip in Sugar Solution

iment.HypothesisOsmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration. When a potato is placed in water, th ...

(3 pages) 51 0 4.6 Jan/2004

Subjects: Science Essays > Biology

Biology Practical to study the Osmosis effects of Sucrose solutions of different Molarities upon Plant Cells (Chinese Radish and Potato Chips)

is experiment is to investigate the movement of water by osmosis in and out of plant cells across a semi permeable membrane in sucrose solutions of different concentrations. The plant cells used in th ... ntial (a dilute solution) to an area of low water potential (a concentration). This occurs across a semi permeable membrane until equilibrium is achieved.Concentration- When a substance dissolves in w ...

(26 pages) 78 0 2.3 Jan/2004

Subjects: Science Essays > Biology > Plant Biology

Osmosis and potato chip invetigation. To determine the effect that varying salt concentration, in a solution, has upon the osmotic ability of potato chips of a given size

e water molecules. However, it is not an isolated laboratory process. Many cell membranes behave as semi/selectively permeable membranes, and osmosis is a vital to their functioning. For example, osmo ... t be able to take place.However, it is able to do so as the water can move through the plant cell's semi permeable membrane which separates the two solutions of different concentrations. Specifically ...

(8 pages) 61 0 3.0 Feb/2004

Subjects: Science Essays > Biology

Biology investigation osmosis

er molecules from a weaker, dilute, solution into a stronger, more concentrated, solution through a semi permeable membrane.Each cell in a leaf is surrounded by a membrane, which separates the content ... solution on the left and a stronger concentrated solution on the right. To even out the solutions a semi permeable membrane allows small water molecules to pass through it from the dilute to the conce ...

(5 pages) 29 0 4.3 Apr/2004

Subjects: Science Essays > Biology

Determining the Isotonic solution in Sheep Erythrocytes Isotonic solution of red blood cells (Laboratory) red blood cell sizes in saline red blood cell expansion in salt

Every cell is selectively permeable to different molecules. This type of selectively is caused by a semi-permeable membrane, which allows the movement of certain molecules across it. Water exchange ca ...

(4 pages) 35 0 4.0 Apr/2004

Subjects: Science Essays > Biology

Introduction and method of experiment on: Investigating the effects of changing salt concentration on osmosis in potato tissue

the transfer of water from an area of high concentration to an area of low concentration through a semi-permeable membrane. To do this I am going to put the chips in different salt concentrations, an ...

(2 pages) 35 0 2.3 May/2004

Subjects: Science Essays > Biology

How the Rate of Diffusion is Affected by the Temperature of Water

living systems. Osmosis is the passage of water from a region of high water concentration through a semi-permeable membrane to a region of low water concentration (Purchon 1). Diffusion is the movemen ...

(4 pages) 31 1 4.7 Aug/2004

Subjects: Science Essays

Investigation to find the effect of different concentrations of sugar solutions on osmosis

molecules from an area of high water concentration to an area of low water concentration, across a semi-permeable membrane' (Collins, 1999).If you get information from books put the copied text in br ... gh. This could be called a strong or concentrated solution.When two such solutions are divided by a semi-permeable membrane the water will move from the area of high concentration to the area of low c ...

(5 pages) 34 1 4.4 Jan/2005

Subjects: Science Essays > Biology

AT1- Osmosis In Potatoes

ly permeable membrane, in this case potato.Introduction: Osmosis is the movement of water through a semi permeable membrane, separating solutions of different concentrations. The water passes from a r ... on, until the two concentrations are equal in concentrations of water.Many cell membranes behave as semi permeable membranes, and osmosis is a vital mechanism in the transport of fluids in living orga ...

(8 pages) 33 0 3.0 Jan/2005

Subjects: Science Essays > Biology

The Lab Report. The rate of ossmosis and the surface area.

is the movement of water molecules from high concentration to a low concentration; and of course a semi-permeable membrane is required for keeping the concentration difference. So it's the movement o ... molecules of water along the "concentration gradient (from high to low concentration)" through the semi-permeable membrane. So the rate of osmosis is "change in concentration(moles) /time(seconds)"No ...

(6 pages) 80 0 4.0 Jun/2005

Subjects: Science Essays > Biology

Investigating Osmsosis - GCSE Coursework.

Planning.Osmosis is the diffusion of water molecules across a semi-permeable membrane. Diffusion is the movement of molecules from an area of high concentration, ... the higher the concentration in salt, the more water particles will move through the potato cell's semi-permeable membranes to try and balance the salt concentration. For example, if you placed a lar ... ly proved that the higher the salt concentration, the more particles move through the potato cell's semi-permeable membranes to try and balance out the salt concentration in the surrounding test tube. ...

(3 pages) 20 0 1.0 Oct/2005

Subjects: Science Essays > Biology

Osmosis Investigation

n of Osmosis:-The experiment shown above demonstrates the process of osmosis. Water flows through a semi permeable membrane into a sugar solution, diluting the solution. The sugar molecules cannot pas ... he different stages. I know this because "Osmosis is the passage of water from a solution through a semi-permeable membrane to a more concentrated solution"Osmosis in Plant Cells:-Plant cells have fea ...

(4 pages) 41 0 2.0 Nov/2006

Subjects: Science Essays > Biology > Plant Biology

Cell transport

tremely tiny; they are only made up of three atoms, which is why they easily pass through the cells semi permeable membrane. They slip right between the membranes phospholipid bi-layer. Osmosis is dri ...

(2 pages) 11 0 3.0 Jun/2007

Subjects: Science Essays > Biology

Testable Question Is it possible to observe diffusion across a

Testable Question Is it possible to observe diffusion across a semi-permeable membrane? Background Research Diffusion is the movement of molecules from an area of ... ifferent region. In dialysis, the selectivity in movement of molecules is accomplished by placing a semi-permeable membrane between two regions, for example, dialysis tubing. The dialysis tubing is ac ... •1 Hypothesis By using the following experiments, it is possible to observe diffusion across a semi-permeable membrane.Results See attached sheets from lab manual Conclusion Consistent with the h ...

(2 pages) 2174 0 0.0 Feb/2008

Subjects: Science Essays > Chemistry

Diffusion Lab

Michael AkibohBiology 101 Non-MajorDiffusion through a Semi SolidIntroductionThis report will cover the Laboratory results of the experiment pertaining to ... the movement of molecules from areas of high concentration to areas of low concentration through a semi-permeable membrane is correct. In order to understand how diffusion through a semi-solid membra ... The Kirkendall effect was not widely accepted in the scientific community until after the diffusion seminar at the 32nd ASM National Congress of Metals in Chicago where R.F. Mehl a leading researcher ...

(4 pages) 26 0 0.0 Jun/2008

Subjects: Science Essays > Biology