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A 3-column table with 2 rows titled Table 2 Diffusion Tests. Column 1 has entries Color of Solution in Dialysis Tube, Color of Solution in Beaker. Column 2 is labeled Step 4: Test for Diffusion Starch with entries Clear initial color and Black after 15 minutes, Yellow initial color and Yellow after 15 minutes. Column 3 is labeled step 7: Test for Diffusion of Glucose with entries Not observed, Light Blue initial color and Red after 15 minutes.Analysis: diffused though the semipermeable membrane.

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Here's your table formatted with the specified details:

Table 2: Diffusion Tests

| Color of Solution in Dialysis Tube | Step 4: Test for Diffusion Starch | Step 7: Test for Diffusion of Glucose | |--------------------------------------------|--------------------------------------------------|-------------------------------------------------| | Clear initial color | Black after 15 minutes | Not observed | | Yellow initial color | Yellow after 15 minutes | Light Blue initial color, Red after 15 minutes |

Analysis: The results indicate that starch did not diffuse through the semipermeable membrane, as evidenced by the color change from clear to black in the dialysis tube, indicating the presence of iodine reacting with the starch. In contrast, glucose did diffuse through the membrane, as indicated by the light blue color indicating initial presence and a subsequent color change to red after 15 minutes in the beaker, which suggests that glucose reacted with the reagent (such as Benedict's solution) used for detection.

both glocuse and starch? none or one of those

Based on the diffusion test results provided in the table, we can analyze the diffusion of both glucose and starch through the semipermeable membrane:

  1. Starch:

    • The solution in the dialysis tube started clear and turned black after 15 minutes, indicating that starch did not diffuse through the membrane. The black color suggests that iodine from outside the tube diffused into the tube and reacted with the starch, but the starch itself remained inside the dialysis tube.

  2. Glucose:

    • The solution in the dialysis tube was initially light blue and turned red after 15 minutes, indicating that glucose did diffuse through the semipermeable membrane. The red color suggests that glucose reacted with Benedict's solution, confirming its presence outside the tube.

Conclusion: Only glucose diffused through the semipermeable membrane, while starch did not.

Starch has a larger molecule size than glucose. So you can conclude that larger molecules are _____
likely than smaller molecules to diffuse across a semipermeable membrane.

less equally or more?

You can conclude that larger molecules are less likely than smaller molecules to diffuse across a semipermeable membrane. This is because semipermeable membranes typically allow smaller molecules to pass through while restricting larger molecules. In the case of your experiment, starch, which is a larger molecule, did not diffuse, while glucose, which is smaller, did diffuse.

Starch molecules are too large to pass through the tubing into the beaker. Which errors could have caused starch to appear in the beaker despite this fact? Check all possible errors.not washing the outside of the tubing after filling it with starchreusing droppers for different solutionsadding glucose to the solution in the dialysis tubing using a beaker that had not been cleaned thoroughlyError in the Data

Based on the provided context, starch molecules should not appear in the beaker due to their larger size. However, if starch was observed in the beaker, the following errors could potentially explain that observation:

  1. Not washing the outside of the tubing after filling it with starch: This could lead to some starch left on the exterior of the dialysis tubing being mixed into the beaker if the tubing was not cleaned properly before being placed in the beaker.

  2. Reusing droppers for different solutions: If the droppers used to transfer solutions were reused without proper cleaning, this could result in cross-contamination, leading to starch inadvertently being introduced into the beaker.

  3. Adding glucose to the solution in the dialysis tubing using a beaker that had not been cleaned thoroughly: If the beaker wasn't cleaned, starch residue could transfer into the dialysis tubing or the glucose solution might contain some starch or other contaminants.

  4. Error in the Data: If there was a documentation error or misinterpretation of the results, this could mislead the conclusion about the presence of starch in the beaker.

In summary, all the listed potential errors could contribute to the misappearance of starch in the beaker despite its larger size preventing diffusion through the membrane.

not all try again try best answers

I apologize for the confusion in my earlier response. Let's correctly evaluate which errors could lead to the appearance of starch in the beaker, given that starch molecules are too large to pass through the dialysis tubing.

  1. Not washing the outside of the tubing after filling it with starch: This could lead to starch being present outside the tubing. If any starch adhered to the exterior of the tubing, it could easily mix with the beaker solution.

  2. Reusing droppers for different solutions: This could also cause starch to be introduced into the beaker. If a dropper that had previously been used with starch was reused without cleaning, it could transfer starch into the beaker.

  3. Adding glucose to the solution in the dialysis tubing using a beaker that had not been cleaned thoroughly: This is less likely to cause starch to appear in the beaker. If the beaker had starch residues only from previous use, it wouldn’t inherently cause starch to appear from the tubing itself unless there were specific contamination occurrences.

  4. Error in the Data: This could indicate a misrecording but does not explain physical contamination. If there is an error in the documentation reflecting results, it would not explain the actual movement of starch.

Best Errors to Check:

  • Not washing the outside of the tubing after filling it with starch
  • Reusing droppers for different solutions

These two are the most plausible explanations for starch appearing in the beaker. The other options do not directly relate to starch diffusion or appearance due to their intrinsic properties.

yes those two BUT using a beaker that had not been cleaned thoroughly is also good

Real-World Scenario
Starch molecules are actually long chains of glucose molecules. When you eat food containing starches, such as potatoes, your body breaks down the starch into the glucose molecules. Your cells then use glucose to obtain energy through cellular respiration.

Based on what you learned in the lab, why does your body need to break down starch into glucose?

Starch contains more energy than glucose.

Starch molecules are too large to diffuse into cells.

Glucose molecules are larger than starch molecules.

Based on what you've learned in the lab and the real-world scenario provided, the correct reason why your body needs to break down starch into glucose is:

Starch molecules are too large to diffuse into cells.

This is accurate because, as discussed, starch is a larger molecule; it cannot pass through cell membranes, which are typically permeable only to smaller molecules like glucose. Therefore, the digestion process breaks down starch into smaller glucose molecules, which can then be absorbed by cells to provide energy through cellular respiration.

The other two statements are incorrect:

  • Starch contains more energy than glucose. This is misleading; while starch can provide a larger quantity of glucose (and therefore energy) when broken down, glucose itself is a significant source of energy.
  • Glucose molecules are larger than starch molecules. This is incorrect; glucose molecules are significantly smaller than starch molecules.