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Observing Osmosis Lab

Observing Osmosis Lab . 9/17/12 Observing Osmosis . On p. 34, COPY and ANSWER the following questions: 1. What does SELECTIVELY (SEMI) PERMEABLE mean? 2. Explain the difference between passive and active transport. Diffusion . Osmosis. Selectively Permeable Membrane.

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Observing Osmosis Lab

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  1. Observing Osmosis Lab

  2. 9/17/12 Observing Osmosis • On p. 34, COPY and ANSWER the following questions: • 1. What does SELECTIVELY (SEMI) PERMEABLE mean? • 2. Explain the difference between passive and active transport.

  3. Diffusion Osmosis Selectively Permeable Membrane – Movement of molecules from a high concentration to a low concentration – Movement of water molecules from a high concentration to a low concentration - Will allow certain molecules and ions to pass through via diffusion while restricting others

  4. Solution Solvent Solute – A homogeneous mixture composed of two or more substances. The solution that forms has the same physical state as the solvent. • Examples - Salt water, Sugar water, Air • Mixture – One compound is added to another and no chemical bond is formed – Substance that dissolves another solid, liquid, or gaseous substance. – Substance dissolved by solvent

  5. Hypotonic Types of Solutions Hypertonic Isotonic – contains less solute (more water) compared to another solution. Water diffuses across a semi-permeable membrane OUT OF a hypotonic solution. (into egg) – contains more solutes (less water) compared to another solution. Water diffusion across a semi-permeable membrane INTO a hypertonic solution (out of egg) – two solutions have the same concentration of solutes (equate amounts of water), so there is NO NET MOVEMENT of water across a semi-permeable membrane.

  6. Lab Setup Vinegar contains acetic acid, which breaks apart the solid calcium carbonate crystals

  7. Lab Setup You will need to be very careful with these eggs now that the shell has been removed. You will clean up any mess you make.

  8. Overview of Lab • Day 1 - Put egg into vinegar. • Why? • Day 3 – Observe egg and record info Carefully rub shell off egg Rinse egg in water and let dry Weigh egg Put egg into corn syrup • Make Hypothesis!

  9. Overview of Lab Continued… • Day 4 – Observe egg and record info Rinse egg in water and let dry Weigh egg Put egg in tap water • Make Hypothesis! • Day 5 – Observe egg and record info Let egg dry Weigh egg Clean-up lab station Data and Analysis

  10. Think of your egg as your baby!

  11. BEWARE OF BREAKAGE! • Think of your egg as your own little baby. • Be gentle and caring with it. • Do not kill your little egg baby. • In other words, if you break your egg at any point in the lab there will be SEVERE consequences for it! • EX: LOSING MAJOR POINTS!

  12. Observing Osmosis Lab Paste your Observing Osmosis Lab to p. 35

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