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Bellwork

Bellwork. What is concentration? (NOT the kind where you’re thinking really hard…) Why is the orange juice you mix with water called “concentrate”? Draw a picture showing the difference between the molecules in a LOW concentration solution vs a HIGH concentration solution.

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Bellwork

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  1. Bellwork • What is concentration? (NOT the kind where you’re thinking really hard…) • Why is the orange juice you mix with water called “concentrate”? • Draw a picture showing the difference between the molecules in a LOW concentration solution vs a HIGH concentration solution

  2. Egg Lab (In lab book) Question: How does a cell react to being placed in different concentrations of salt or sugar solutions? Hypothesis: (leave a blank space- we will come back to this)

  3. Background Information • Cell Membrane is semi-permeable (lets some thing in, keeps other things out) • An unfertilized egg is one HUGE cell underneath the hard shell is a semi-permeable cell membrane

  4. Concentration • Concentration: How close together molecules are in a solution; (amount of solute in an amount of solvent) • Which beaker has a higher concentration of food coloring?

  5. Solute- a substance (molecules) that gets dissolved • Solvent- a fluid that other molecules dissolve in • Solution- an even mixture of solute and solvent

  6. Egg Lab (In lab book) Question: How does a cell react to being placed in different concentrations of salt or sugar solutions? Hypothesis: If, then, as measured by….

  7. Procedures • Place bowl on scale & zero out • CAREFULLY add egg to bowl & weigh in grams. Record. • In beaker, prepare a ____% ________ solution. First add ____mL _______, THEN add 200mL ___________ • Stir solution until all solute is dissolved • Label beaker with % solute & period# & group # • Carefully place your egg in solution & leave overnight in class bin • Weigh egg again after it has soaked overnight

  8. Procedure #3: Prepare a…. Lab Group 15% salt solution • Lab Group 2 10% salt solution • Lab Group 3 25% salt solution • Lab Group 4  50% salt solution Lab Group 55% sugar solution • Lab Group 610% sugar solution • Lab Group 725% sugar solution • Lab Group 8 50% sugar solution Procedure #3 continued…. 5% = FIRST add 10mL (solute) THEN add 200 mLH2O 10%= FIRST add 20mL (solute) THEN add 200 mLH2O 25%= FIRST add 50mL (solute) THEN add 200 mLHOT H2O 50%= FIRST add 100mL (solute) THEN add 200 mLHOT H2O

  9. Data Table

  10. Go to the Lab! • Raise hand to be dismissed from lab & come record your day 1 data @ Ms. D’s computer

  11. 18 days until science fair data due

  12. Closure- out loud with group • Do you think the semi-permeable cell membrane lets salt and/or sugar pass through? Explain why or why not. (salt breaks apart into Na+ and Cl- charged ions, and sugar-sucrose- is a large carbohydrate macromolecule) • Predict what will happen to the 0% controls vs the 50% solutions

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