• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Aim: I am going to see what happens when a potato chip is put into 0m, 0.25m, 0.5m, 0.75m and 1m salt water.

Extracts from this document...

Introduction

OSMOSIS Introduction: 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. The definition contains three important statements: 1. 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. 2. 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. 3. 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 Cell membranes are completely permeable to water; therefore, the environment the cell is exposed to can have a dramatic effect on the cell. Isotonic Solutions: contain the same concentration of solute as another solution. When a cell is placed in an isotonic solution, the water diffuses into and out of the cell at the same rate. The fluid that surrounds the body cells is isotonic. In the diagram provided above it states a partially permeable membrane with sugar. In my investigation I will be using a salt solution Aim: I am going to see what happens when a potato chip is put into 0m, 0.25m, 0.5m, 0.75m and 1m salt water. ...read more.

Middle

Example: the original mass of 0m is 0.905. After being in the solution for 5 minutes the final mass is 0.930. From that I can now work out the change in mass and the % change in mass this will again happen after 10 and 15 minutes I will start off at 0m then go up to 0.25m, then to 0.5m and finishing at 0.75m after the chip has been in the solution for the correct time it has to be dried. Then will be weighed again for the final mass (explained above, underlined) At the end of the experiment which will roughly take place over two lessons I will collect the results which will be shown later Apparatus: The apparatus needed for this experiment will be: * Stop watch, to time 5, 10 and 15 minutes. * 3 potato chips (all measuring 2.5cm) * Petri dish * 0m, 0.25m, 0.5m, 0.75m, 1m salt solution. * Balance * Measuring cylinder * Salt * Borer, knife . Fair test: To make my experiment a fair test I will keep these things the same: * Size, measurement of potato * Brand of potato * Time in solution (5, 10 and 15 minutes) The only thing I can change is the strength of the salt solution. Results: After completing for experiment my results are as follows: 0m Original mass (g) ...read more.

Conclusion

Half a Petri dish was filled for each experiment. * Timing was accurate, however as I mentioned some of the chips were left for a few extra tenths of a second. But overall each timing was correct. Factors I feel that were not as accurate as I would have liked is that the potato chips may not have all been the same size. We measured them out at 2.5cm each but 1 or 2 might have been either a little bit bigger or even a little bit smaller. we did however use the correct tools to cut and measure the chips so the measurements wouldn't of been that out. Some results came back anomalous, instead of repeating it, we simply took the anomalous result out, and found the average by adding up the two other % changes in mass, and dividing it by 2. If in 1 experiment there wasn't an anomalous result we would have added up all 3 % changes and then divided by 3. Nothing during the experiment happened that would have been of any use or advantage/disadvantage. Maybe except that on a few of our results they came back anomalous, but we did not know this until the experiment was over and new weights were given and the % change in mass was found. If we were to do another experiment using a potato chip we could maybe change the length of time, or change how much salt solution we actually used in each experiment. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our GCSE Classifying Materials section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Classifying Materials essays

  1. What happens to the mass of a raisin when you put it onto different ...

    - Keep an eye on the beakers. - Don't run with experiments. I will make it a fair test by putting the same amount of sugar solution in each beaker and the times recorded will be the same. Results First set of results Mass of raisin before (g)

  2. Chemistry Coursework. Aim: To find out if the thickness of plastic bags is ...

    One of the key ingredients in manufacturing plastic bags is vinyl chloride, which is a proven carcinogenic and may also cause liver, kidney, and brain damage. This chemical has a high toxicity. For: It takes more than four times as much energy to manufacture a paper bag as it does to manufacture a plastic bag.

  1. Our experiment consisted of two samples of water containing unknown substances, and our objective ...

    of water A N/A Hard B 8cm3 Soft We used up all of the soap in the burette and even used more soap, but the lather still wasn't good enough. We decided that we should stop because we would just be wasting soap and not getting very far.

  2. should salt be banned?

    The Food Standards Agency (FSA) also warns that three-quarters of the salt we eat is already in the food we buy. An FSA spokesman said, "Lots of people think they don't eat a lot of salt, especially if they don't add it to their food. But don't be so sure.

  1. Affect of concentration on reaction

    This is because the concentration has an positive effect on the rate of reaction (refer back to p.7 Effect of concentration on reactions). The lines on the graph are curved, steep at beginning and gradually level out. When calcium carbonate was put into the acid, the rate of reaction increased

  2. Determining the water of crystalisation

    I put the crucible with lit and salt onto Bunsen burner and heated it strongly for 4 minutes. At the end I put off the lit to let the water moisture to evaporate. Since the mass of crucible can differ in different temperatures I had to leave it to cool

  1. Which equatoin is correct

    and (2) are, as follows: Equation (1) Volume = Moles ? 24.0dm3 = 1.25 ? 24.0 = 30.0 dm3 Equation (2) Volume = Moles ? 24.0dm3 = 1 ? 24.0 = 24.0 dm3 In my experiment the volume of gas produced will be collected using an apparatus with maximum capacity of 100cm3.

  2. Separating Salt & Fat from Crisps

    We could control this by measuring the amount of water and whit spirit to make it equal and used the same amount of chips in both experiments. Results: Raw data: Table #2 Our data: Chips (g) Mass of the conical flask (g) Mass of the conical flask + filtration (g)

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work