What variables effect omosis in potatoes

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GCSE Coursework

What variables effect omosis in potatoes.

Information about osmosis.

Osmosis is the movement of water molecules from a region where there is high concentration to where there is low concentration, this often occurs across a selectively permeable membrane. This is an area of selectively permeable cells that only allow certain substances to cross and prohibit others. The reduction in size of the chip may be due to this process.

In a plant cell – if it is put into pure H2O, it will not rupture because the cell wall is fully permeable to water so therefore osmosis can not occur.

Osmosis in a cell membrane – cell membranes are selectively permeable and if put into pure water it would swell because the cell wall is strong. They also do not burst but becomes turgid.

If a plant cell is put into a salt solution, water moves out of the cell and so the cell shrinks and becomes flaccid. This process is called Plasmolysis, the plant cell shrinks because the cell membrane tears away form the cell wall.

Aim

To find out what difference the concentration of a salt solution makes to the size of a raw potato chip.

I predict that that there is a proportional relationship between the current flowing through the wire and the strength of an electromagnet. Therefore this means that as one is increased then the other will increase. I think this due to the domain theory.

Normally without an iron core, when current is passed through a wire a magnetic field is created along the axis of the wire coil. Although despite this the field is not very substantial, yet when an iron core is inserted into the wire coil, the magnetic field that is flowing in the direction of the axis, alters and arranges the domains within the iron to an attractive polarisation. It is due to this fact that the change of domains in polarisation greatly increases the strength of the magnet; therefore resulting in an increase in the strength of the magnet and therefore attracting an increase in iron filings.

I can relate this to my prediction about the increase in current. I think that more current will affect the strength of the magnet; as the current is increased the more domains arrange in the same direction, this continues to occur until the core reaches saturation point and an increase in the current has little further effect. From my research the saturation point of an iron core is when all of the domains are of the same alignment. Although I have found from previous research that the core can often retain a small amount of magnetism when the current is stopped. This can effect the amount of iron filings that are attracted. Although, when this occurs, shocking or colliding the core against a hard surface can discharge it.

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Method

In order to carry out the experiment the potential variables which could be altered, and their effects on the strength of the magnetic field must be identified they are:

The core material, the current, the Voltage, the coil density (size of wire), number of coils, the conductivity of the wire coil, the Core mass, the distance between the load and the electromagnet and the material of the Ferro magnetic coil.

All of the variables that I have written above I will keep the constant throughout the experiment will except for the current that I will ...

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