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What are the factors that affect diffusion?
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Explain how temperature affects diffusion?
Explain how molecule size affects the rate of diffusion?
Explain how concentration gradient affects diffusion.
PART 2: EFFECT OF MOLECULAR WEIGHT ON DIFFUSION
Define molecular weight?
In the experiment, why is the diffusion rate of HCl greater (faster) than the diffusion rate of citric acid? In other words, why does HCl diffuse faster than citric acid?
ACTIVITY: Which of the two acids, nitric or sulfuric, will diffuse faster? WHY?
PART 3: OSMOSIS
Distinguish between a solvent and a solute.
Explain the differences in the three types of solutions: hypertonic, hypotonic, isotonic.
PART 4: OSMOSIS IN ANIMAL CELLS
Explain how and why the red blood cells were affected in each of the solutions: beaker 1,beaker 2, beaker 3.
Explain why the E1 egg in the beaker with distilled water gained weight while the E2 egg in the beaker with 10% salt solution lost weight? HINT: Include the terms “hypotonic” and “hypertonic” in your answers.
PART 5: OSMOSIS IN PLANT CELLS
What causes a plant cell to be turgid? HINT: Refer to the textbook Ch. 5, p. 76, 5.5 “Water balance between cells and their surroundings is crucial to organisms.” The information about marine plants is misleading.
Explain what happens to the cells of the Elodea leaf S1 in distilled water AND to the cells of leaf S2 in 20% NaCl solution. HINT: Include the terms “hypotonic” and “hypertonic” in your responses.
ANALYSIS AND CONCLUSIONS:Explain what might happen and why to a freshwater fish placed in a salt water environment. HINT: Include the terms “hypotonic” and “hypertonic” in your response.
Explain what might happen when a person has too much sodium (salt) in his diet. HINT: the opposite occurs to the human from the freshwater fish. Discuss what happens to the fluids in the human body and the consequences of too much salt. Use the terms “hypertonic” and “hypotonic” in your answer.
