Jin+Ho

Planning an Experiment—Biology Trimester Investigation

EACH STUDENT IS RESPONSIBLE FOR WRITING UP A CLEAR PLAN FOR YOUR INVESTIGATION, EVEN IF YOU ARE WORKING IN A GROUP.

Question(s) for investigation: What is the rate of osmosis with various types of chemical compounds? What can you observe when you add different amounts and types of compounds to onion cell

Independent variable and how it will be measured: 1. Onion cell 2. Amount of compounds 3. concentration in water 4. Temperature, Sunlight, Atmosphere 5. Measuring time

Dependent variable(s) and how it (they) will be measured: 1. Rate of compounds - we will measure with a calculator and electronic instruments what Mr. Happer has.

Variables held constant: 1. Amount of water 2. Size of containers 3. Keep it in same place 4. Temperature of water

List of Materials and Sketch of the Setup:

1. Petri dish 2. Microscope 3. Onion cells 4. sugars/salt 5. Beaker 6. Calculator 7. Pipette 8. Water

Who else will work on this investigation? Who will be responsible for collecting materials to get started and when will all materials be ready to begin? - I and Zwa will work on this experiment. We are all responsible for collecting materials but Mr.Happer will help us collect additional sub materials. I think all materials will set up by this week (Thursday).

Procedure/Method:

1. Place onion cell samples in Petri dishes 2. Figure out the normal rate of osmosis of the various cells 3. Prepare a solution with different concentrations of compounds 4. Add different amount of solute to the onion cells 5. Observe and measure the differences.

Data: • Make a blank data table which you plan to fill out during the investigation  What other data do you expect to include in a report of your results?

The table will be given to you by edliting file


 * Time
 * Size of the cell

Expectations: • What do you think might happen and why?

We expect the cell to either shrink or swell when we add the various amounts of solution because the osmosis rate may be isotonic or endotonic (?)

-Swell up of shrink _ nothing at all or cell might die.
 * What other results do you imagine might happen and what would they mean?

Communication: -By a specific graph and table.
 * How will you plan to communicate your work clearly to others? •

-We can finish our experiment with conclusive results by next 3 classes.
 * What do you expect to accomplish in EACH of the next three class periods in which you can work on this investigation? •

I Send the additional file to your email..