Glucose and Diffusion Concepts

Mr. Anderson introduces a diffusion and osmosis lab, explaining diffusion as the movement of molecules from high to low concentration. He describes various molecules like starch, glucose, and water, and their roles in the experiment. The video includes a demonstration using dialysis tubing, where starch and glucose are placed inside, and Lugal solution is outside. The experiment shows glucose diffusing through the tubing, indicated by color changes. The task is to rank molecules by size, using diffusion principles and logic.

What is the primary driving force behind diffusion?

• Temperature gradients

• Pressure differences

• Molecular motion

• Gravity

Which of the following is a polysaccharide?

• Water

• Iodine

• Starch

• Glucose

What is the chemical formula for glucose?

• H2O

• CO2

• C6H12O6

• NaCl

What is the role of Lugal solution in the experiment?

• To dissolve glucose

• To indicate the presence of starch

• To seal the dialysis tubing

• To provide nutrients

What is the purpose of the dialysis tubing in the experiment?

• To provide a surface for reactions

• To filter out large molecules

• To measure temperature changes

• To act as a container for the solution

What is the initial color of the glucose test strip?

• Blue

• Green

• Red

• Yellow

What does a positive glucose test indicate?

• Absence of water

• Presence of glucose

• Presence of starch

• Absence of iodine

What change is observed in the beaker after 10 minutes?

• The color becomes lighter

• The solution evaporates

• The color becomes darker

• The color remains the same

What is the final task in the experiment?

• Measure the temperature

• Rank substances by size

• Calculate the concentration

• Identify unknown substances

Which substance is expected to be the smallest in size?

• Water

• Glucose

• Dialysis tubing pores

• Starch