Egg Osmosis Lab Name: __________________________ Introduction: Cells have an outer covering called the cell membrane. This membrane is selectively permeable; it has tiny pores or holes that allow objects to move across it. The cell membrane controls what moves in an out of the cell. Food and oxygen move into cells across the cell membrane through the process of diffusion. Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. Osmosis is a special type of diffusion – it is the diffusion of water across a selectively permeable membrane. Osmosis occurs when water moves from an area where it is more concentrated to an area where it is less concentrated. We are going to use eggs to observe the process of osmosis. Please complete the following lab report carefully. All parts of this lab will be marked individually. Purpose: To observe how osmosis can affect the mass of an egg after being soaked in various liquids. Materials: 3 raw eggs, shells in tack 300 mL of vinegar x 3 300 mL of tap water, salt water, and corn syrup metric tape a scale marker masking tape Hypothesis: Predict how the egg will respond after each of the following conditions: After being soaked in vinegar for 24 hours: After being soaked in tap water for 24 hours: After being soaked in salt water for 24 hours: being soaked in corn syrup for 24 hours:
What liquids caused the egg to shrink? Explain why some eggs swelled and some eggs shrunk using the concept of osmosis. Criteria Level 1 2 Level 3 Level 4 Knowledge and Understanding Demonstrates limited understanding of osmosis and diffusion and how Demonstrates some understanding of osmosis and diffusion and how Demonstrates good understanding of osmosis and diffusion and how Demonstrates thorough understanding of osmosis and diffusion and how
they work in organisms. they work in organisms. they work in organisms. they work in organisms. Thinking Uses scientific inquiry to develop a vague hypothesis and draw few conclusions about an experiment involving osmosis. Uses scientific inquiry to develop a hypothesis and draw some conclusions about an experiment involving osmosis. Uses scientific inquiry to develop a hypothesis and draw conclusions about an experiment involving osmosis. Uses scientific inquiry to develop a strong hypothesis and draw effective conclusions about an experiment involving osmosis. Communication Uses limited scientific vocabulary when communicating the results of an experiment. Organizes information into bar graphs to show comparisons with limited effectiveness. Uses some scientific vocabulary when communicating the results of an experiment. Organizes information into bar graphs to show comparisons with some effectiveness. Uses good scientific vocabulary when communicating the results of an experiment. Organizes information into bar graphs to show comparisons with effectiveness. Uses thorough scientific vocabulary when communicating the results of an experiment. Organizes information into bar graphs to show comparisons with limited effectiveness. Application Uses bar graph with limited effectiveness to draw conclusions about an experiment. Uses bar graph with some effectiveness to draw conclusions about an experiment. Uses bar graph with good effectiveness to draw conclusions about an experiment. Uses bar graph with excellent effectiveness to draw conclusions about an experiment.