Laboratory Week 4

At the beginning of the week we learned about osmosis and diffusion. Now we are going to see it in action. This week's experiment is: The Great Eggsperiment


NOTE: This is what C block did (A and D blocks, because we don't have lab on Saturday we will do a modified version of the experiment in class)

Procedure: Step 1: Creating a solution: You want to make a secret formula for a solution that only your group members know. The materials you can use are: sugar, water, salt and corn syrup. Write the formula for your secret solution in your lab notebook.

a) For example: 10g salt + 100ml water = 10% salt water solution

NOTE: The higher the concentration of solutes, the more change you might see….

b) label your solution: group member’s name’s, date, time

Data Collection: Step 2: Making Primary Observations:

a) Imagine you are describing your egg to someone over the phone. Write a detailed description of what your egg looks like.

b) Draw a picture of what the egg looks like. Make a note of any distinguishing characteristics (things that make your egg unique). (include at least 3 labels)

c) How will you know that change in your egg occurred? What will you do?

Data Collection: Step 3: Make a prediction:

a) What do you think will happen to your egg when you add the solution?

b) How long do you think it will take for you egg to show any change?

Data Collection: Step 4: Secondary Observations

a) Add the solution your egg.

b) Write down what you see

c) How often will you take the mass of your egg?

Data Collection: Step 5: Final Observations

a) How does the final mass of your egg compare to the starting mass.

b) Graph your results (time vs. percent change in mass).

Conclusions: Step 6: Analysis

1. Why did we use an egg for this experiment?
2. What else besides an egg could we have used?
3. How did your egg react to your solution?
4. Did all eggs react the same?
5. What do you think caused your egg to react the way it did?
6. If you were to do this experiment again, what are at least three things you would change to make it better (explain each factor).

C block: Lab notebooks will be due in class on Friday.