Osmosis Egg Lab: Outline and Rubric

The Osmosis Egg Experiment

Purpose/Question:  “How do different water concentrations affect the turgor pressure and mass of animal cells?”

Hypothesis:

What will happen to the egg in…..

Vinegar:

Tap Water:

Corn Syrup:

Materials:

• beakers
• eggs
• vinegar
• tap water
• corn syrup
• scale

Diagram:

Procedure:

1. Take an egg.  Weight it.
2. Soak it in vinegar over night (until the shell dissolves)
3. Take the egg out of the vinegar and weigh it.  Record results.
4. After weighing the egg, place it in a beaker filled with tap water over night.
5. Take the egg out of the tap water, observe the changes, and weigh it again.  Record results.
6. After weighing the egg, place it in the beaker and cover the egg with corn syrup over night.
7. Take the egg out of the corn syrup and weigh it.  Record your results.

Observations:

Egg Mass (grams)	Solution	General Observations
	VINEGAR
	TAP WATER
	CORN SYRUP

Analysis/Conclusion:

What were the results of the experiment and why?  Use the theory of osmosis and any and all scientific vocabulary to support your answer.

Application:

Questions assigned from the textbook

The Lab Report Expectations

Lab Reports are given 7 days to complete.  They should be typed.  Class time will be provided.

This lab was assigned Friday, December 4th.  It is due Friday, December 11th.

All Labs must include all 8 elements of the Scientific Method:

Purpose:  The reason you are conducting the experiment

Hypothesis:  A guess as to what you think will happen

Materials:  What “stuff” did you use?  Record this in point form.

Procedure:  What were the steps of the experiment?  This is to be done in point form.

Observations:  Always recorded in a chart.  This is done in point form. Tell me what you “see”

Diagram:  Done with pencil and coloured pencil.  Lines are drawn with a ruler

Analysis:  Explain what happened and why. Use the theories and vocabulary taught in class. This section is the bulk of your mark. It should be at least half a page in length.

Application: Questions from the textbook

	4	3	2	1
Purpose/Materials/ Procedure	all of these sections are thoroughly completed neatly and where necessary in point form	most of these sections are  completed neatly and where necessary in point form	some of these sections are thoroughly completed neatly and where necessary in point form	few of these sections are thoroughly completed neatly and where necessary in point form
Hypothesis	formed to include all testing aspects of the experiment	formed to include most testing aspects of the experiment	formed to include some testing aspects of the experiment	formed to include few testing aspects of the experiment
Observations	detailed notes on what the student “saw” completed in point form and in a chart.  May include  diagrams throughout	detailed notes on most of what the student “saw” completed in point form and in a chart.	notes on some of what the student “saw” completed in point form and in a chart.	sparse notes on little of what the student “saw” completed in point form and in a chart.
Diagram	includes all materials and steps of the experiment	includes most materials and steps of the experiment	includes some materials and steps of the experiment	includes few materials and steps of the experiment
Application	all questions are answered in detail.	most questions are answered in detail.	some questions are answered in detail.	few questions are answered in detail.
Analysis	demonstrates a thorough understanding of the reason why the experiment was conducted, and its importance to the concept being studied	demonstrates a considderable understanding of the reason why the experiment was conducted, and its importance to the concept being studied	demonstrates some understanding of the reason why the experiment was conducted, and its importance to the concept being studied	demonstrates a limited understanding of the reason why the experiment was conducted, and its importance to the concept being studied
Overall Mark

Alternate Assignment

Write a paper explaining what you did in your experiment.  Answer the following questions:

Why did you do this experiment?

What were you testing?

What did you do?

What did you see?

What were the results?

Draw a diagram to accompany your paper.  

	4	3	2	1
Knowledge and Understanding	paper answers all of the required questions	paper answers most of the required questions	paper answers some of the required questions	paper answers few of the required questions
Thinking and Inquiry	Diagram is planned to include all materials and steps of the assignment	Diagram is planned to include most materials and steps of the assignment	Diagram is planned to include some materials and steps of the assignment	Diagram is planned to include few materials and steps of the assignment
Communication	uses all the correct science terminology and his/her own words throughout the paper	uses most of the correct science terminology and his/her own words throughout the paper	uses some of the correct science terminology and his/her own words throughout the paper	uses limited correct science terminology and his/her own words throughout the paper
Application	demonstartes a thorough knowledge of the meaning of the experiment	demonstartes a considerable knowledge of the meaning of the experiment	demonstartes some knowledge of the meaning of the experiment	demonstartes a limited knowledge of the meaning of the experiment