Water Potential and Osmosis Controlled Assessment
- Created by: ChloeIveson
- Created on: 26-03-14 15:34
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- Water Potential and Osmosis Controlled Assessment
- Definition
- Osmosis is the net movement of water molecules from a region of higher water potential to an region of lower water potential across a partially permeable membrane
- Solute = what's dissolved
- Solvent = The medium that it's dissolved
- Solution = Solute + Solution
- Solute = what's dissolved
- Solution = Solute + Solution
- Possible Experimental errors
- Problem with weighing
- Problem with blotting
- Overfilling water sausage so that no more water can enter.
- Putting the solution in the wrong place
- Splitting the water sausage
- Remember to:
- Compare the sets of results to each other
- Use comparative units and figures from table/graph
- Identify anomalous results (even small ones!)
- Take more results to identify what is happening between points
- Water potential
- Factors that affect rate of diffusion
- Temerature
- Surface Area
- Concentration Gradient
- Molecule Size (smaller diffuse faster)
- Presence of moisture
- ?
- The likelihood /potential of water molecules to diffuse out of a solution
- Water moves from a region of high water potential to an region of low water potential
- Higher water potential is closer to zero
- Pure water has a water potential of Zero
- Higher water potential is closer to zero
- Higher solute potential = lower water potential
- Factors that affect rate of diffusion
- Concentrations
- In a less concentrated solution, water will enter the cell by osmosis
- Hyper tonic solution
- In a more concentrated solution water will leave the cell my osmosis
- Hypo tonic solution
- In a less concentrated solution, water will enter the cell by osmosis
- Definition
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